Eclipse JDT Plug-in Developer Guide (Galileo) - Signature (Eclipse JDT API Specification)

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Release 3.5

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org.eclipse.jdt.core
Class Signature


java.lang.Object
  
org.eclipse.jdt.core.Signature

public final class Signature
extends Object
extends Object

Provides methods for encoding and decoding type and method signature strings.

Signatures obtained from parsing source files (i.e. files with one of the Java-like extensions) differ subtly from ones obtained from pre-compiled binary (".class") files in class names are usually left unresolved in the former. For example, the normal resolved form of the type "String" embeds the class's package name ("Ljava.lang.String;" or "Ljava/lang/String;"), whereas the unresolved form contains only what is written "QString;".

Generic types introduce to the Java language in J2SE 1.5 add three new facets to signatures: type variables, parameterized types with type arguments, and formal type parameters. Rich signatures containing these facets only occur when dealing with code that makes overt use of the new language features. All other code, and certainly all Java code written or compiled with J2SE 1.4 or earlier, involved only simple signatures.

Note that the "Q" and "!" formats are specific to Eclipse; the remainder are specified in the JVM spec.

The syntax for a type signature is:

 TypeSignature ::=
     "B"  // byte
   | "C"  // char
   | "D"  // double
   | "F"  // float
   | "I"  // int
   | "J"  // long
   | "S"  // short
   | "V"  // void
   | "Z"  // boolean
   | "T" + Identifier + ";" // type variable
   | "[" + TypeSignature  // array X[]
   | "!" + TypeSignature  // capture-of ?
   | ResolvedClassTypeSignature
   | UnresolvedClassTypeSignature

 ResolvedClassTypeSignature ::= // resolved named type (in compiled code)
     "L" + Identifier + OptionalTypeArguments
           ( ( "." | "/" ) + Identifier + OptionalTypeArguments )* + ";"
     | OptionalTypeParameters + "L" + Identifier +
           ( ( "." | "/" ) + Identifier )* + ";"

 UnresolvedClassTypeSignature ::= // unresolved named type (in source code)
     "Q" + Identifier + OptionalTypeArguments
           ( ( "." | "/" ) + Identifier + OptionalTypeArguments )* + ";"
     | OptionalTypeParameters "Q" + Identifier +
           ( ( "." | "/" ) + Identifier )* + ";"

 OptionalTypeArguments ::=
     "<" + TypeArgument+ + ">"
   |

 TypeArgument ::=
   | TypeSignature
   | "*" // wildcard ?
   | "+" TypeSignature // wildcard ? extends X
   | "-" TypeSignature // wildcard ? super X

 OptionalTypeParameters ::=
     "<" + FormalTypeParameterSignature+ + ">"
   |

Examples:

"[[I" denotes int[][]
"Ljava.lang.String;" denotes java.lang.String in compiled code
"QString;" denotes String in source code
"Qjava.lang.String;" denotes java.lang.String in source code
"[QString;" denotes String[] in source code
"QMap<QString;*>;" denotes Map<String,?> in source code
"Qjava.util.List<TV;>;" denotes java.util.List<V> in source code
"<E;>Ljava.util.List;" denotes <E>java.util.List in source code

The syntax for a method signature is:

 MethodSignature ::= OptionalTypeParameters + "(" + ParamTypeSignature* + ")" + ReturnTypeSignature
 ParamTypeSignature ::= TypeSignature
 ReturnTypeSignature ::= TypeSignature

Examples:

"()I" denotes int foo()
"([Ljava.lang.String;)V" denotes void foo(java.lang.String[]) in compiled code
"(QString;)QObject;" denotes Object foo(String) in source code

The syntax for a formal type parameter signature is:

 FormalTypeParameterSignature ::=
     TypeVariableName + OptionalClassBound + InterfaceBound*
 TypeVariableName ::= Identifier
 OptionalClassBound ::=
     ":"
   | ":" + TypeSignature
 InterfaceBound ::=
     ":" + TypeSignature

Examples:

"X:" denotes X
"X:QReader;" denotes X extends Reader in source code
"X:QReader;:QSerializable;" denotes X extends Reader & Serializable in source code

This class provides static methods and constants only.

Restriction:: This class is not intended to be instantiated by clients.

Field Summary

static int ARRAY_TYPE_SIGNATURE
          Kind constant for an array type signature.

static int BASE_TYPE_SIGNATURE
          Kind constant for a base (primitive or void) type signature.

static char C_ARRAY
          Character constant indicating an array type in a signature.

static char C_BOOLEAN
          Character constant indicating the primitive type boolean in a signature.

static char C_BYTE
          Character constant indicating the primitive type byte in a signature.

static char C_CAPTURE
          Character constant indicating a capture of a wildcard type in a signature.

static char C_CHAR
          Character constant indicating the primitive type char in a signature.

static char C_COLON
          Character constant indicating the colon in a signature.

static char C_DOLLAR
          Character constant indicating the dollar in a signature.

static char C_DOT
          Character constant indicating the dot in a signature.

static char C_DOUBLE
          Character constant indicating the primitive type double in a signature.

static char C_EXCEPTION_START
          Character constant indicating an exception in a signature.

static char C_EXTENDS
          Character constant indicating a bound wildcard type argument in a signature with extends clause.

static char C_FLOAT
          Character constant indicating the primitive type float in a signature.

static char C_GENERIC_END
          Character constant indicating the end of a generic type list in a signature.

static char C_GENERIC_START
          Character constant indicating the start of a formal type parameter (or type argument) list in a signature.

static char C_INT
          Character constant indicating the primitive type int in a signature.

static char C_LONG
          Character constant indicating the primitive type long in a signature.

static char C_NAME_END
          Character constant indicating the end of a named type in a signature.

static char C_PARAM_END
          Character constant indicating the end of a parameter type list in a signature.

static char C_PARAM_START
          Character constant indicating the start of a parameter type list in a signature.

static char C_RESOLVED
          Character constant indicating the start of a resolved, named type in a signature.

static char C_SEMICOLON
          Character constant indicating the semicolon in a signature.

static char C_SHORT
          Character constant indicating the primitive type short in a signature.

static char C_STAR
          Character constant indicating an unbound wildcard type argument in a signature.

static char C_SUPER
          Character constant indicating a bound wildcard type argument in a signature with super clause.

static char C_TYPE_VARIABLE
          Character constant indicating the start of a resolved type variable in a signature.

static char C_UNRESOLVED
          Character constant indicating the start of an unresolved, named type in a signature.

static char C_VOID
          Character constant indicating result type void in a signature.

static int CAPTURE_TYPE_SIGNATURE
          Kind constant for the capture of a wildcard type signature.

static int CLASS_TYPE_SIGNATURE
          Kind constant for a class type signature.

static String SIG_BOOLEAN
          String constant for the signature of the primitive type boolean.

static String SIG_BYTE
          String constant for the signature of the primitive type byte.

static String SIG_CHAR
          String constant for the signature of the primitive type char.

static String SIG_DOUBLE
          String constant for the signature of the primitive type double.

static String SIG_FLOAT
          String constant for the signature of the primitive type float.

static String SIG_INT
          String constant for the signature of the primitive type int.

static String SIG_LONG
          String constant for the signature of the primitive type long.

static String SIG_SHORT
          String constant for the signature of the primitive type short.

static String SIG_VOID
          String constant for the signature of result type void.

static int TYPE_VARIABLE_SIGNATURE
          Kind constant for a type variable signature.

static int WILDCARD_TYPE_SIGNATURE
          Kind constant for a wildcard type signature.

Method Summary

static char[] createArraySignature (char[] typeSignature, int arrayCount)
          Creates a new type signature with the given amount of array nesting added to the given type signature.

static String createArraySignature ( String typeSignature, int arrayCount)
          Creates a new type signature with the given amount of array nesting added to the given type signature.

static char[] createCharArrayTypeSignature (char[] typeName, boolean isResolved)
          Creates a new type signature from the given type name encoded as a character array.

static char[] createMethodSignature (char[][] parameterTypes, char[] returnType)
          Creates a method signature from the given parameter and return type signatures.

static String createMethodSignature ( String[] parameterTypes, String returnType)
          Creates a method signature from the given parameter and return type signatures.

static char[] createTypeParameterSignature (char[] typeParameterName, char[][] boundSignatures)
          Creates a new type parameter signature with the given name and bounds.

static String createTypeParameterSignature ( String typeParameterName, String[] boundSignatures)
          Creates a new type parameter signature with the given name and bounds.

static String createTypeSignature (char[] typeName, boolean isResolved)
          Creates a new type signature from the given type name encoded as a character array.

static String createTypeSignature ( String typeName, boolean isResolved)
          Creates a new type signature from the given type name.

static int getArrayCount (char[] typeSignature)
          Returns the array count (array nesting depth) of the given type signature.

static int getArrayCount ( String typeSignature)
          Returns the array count (array nesting depth) of the given type signature.

static char[] getElementType (char[] typeSignature)
          Returns the type signature without any array nesting.

static String getElementType ( String typeSignature)
          Returns the type signature without any array nesting.

static int getParameterCount (char[] methodSignature)
          Returns the number of parameter types in the given method signature.

static int getParameterCount ( String methodSignature)
          Returns the number of parameter types in the given method signature.

static char[][] getParameterTypes (char[] methodSignature)
          Extracts the parameter type signatures from the given method signature.

static String[] getParameterTypes ( String methodSignature)
          Extracts the parameter type signatures from the given method signature.

static char[] getQualifier (char[] name)
          Returns a char array containing all but the last segment of the given dot-separated qualified name.

static String getQualifier ( String name)
          Returns a string containing all but the last segment of the given dot-separated qualified name.

static char[] getReturnType (char[] methodSignature)
          Extracts the return type from the given method signature.

static String getReturnType ( String methodSignature)
          Extracts the return type from the given method signature.

static char[] getSignatureQualifier (char[] typeSignature)
          Returns package fragment of a type signature.

static String getSignatureQualifier ( String typeSignature)
          Returns package fragment of a type signature.

static char[] getSignatureSimpleName (char[] typeSignature)
          Returns type fragment of a type signature.

static String getSignatureSimpleName ( String typeSignature)
          Returns type fragment of a type signature.

static char[] getSimpleName (char[] name)
          Returns the last segment of the given dot-separated qualified name.

static String getSimpleName ( String name)
          Returns the last segment of the given dot-separated qualified name.

static char[][] getSimpleNames (char[] name)
          Returns all segments of the given dot-separated qualified name.

static String[] getSimpleNames ( String name)
          Returns all segments of the given dot-separated qualified name.

static char[][] getThrownExceptionTypes (char[] methodSignature)
          Extracts the thrown exception type signatures from the given method signature if any The method signature is expected to be dot-based.

static String[] getThrownExceptionTypes ( String methodSignature)
          Extracts the thrown exception type signatures from the given method signature if any The method signature is expected to be dot-based.

static char[][] getTypeArguments (char[] parameterizedTypeSignature)
          Extracts the type argument signatures from the given type signature.

static String[] getTypeArguments ( String parameterizedTypeSignature)
          Extracts the type argument signatures from the given type signature.

static char[] getTypeErasure (char[] parameterizedTypeSignature)
          Extracts the type erasure signature from the given parameterized type signature.

static String getTypeErasure ( String parameterizedTypeSignature)
          Extracts the type erasure signature from the given parameterized type signature.

static char[][] getTypeParameterBounds (char[] formalTypeParameterSignature)
          Extracts the class and interface bounds from the given formal type parameter signature.

static String[] getTypeParameterBounds ( String formalTypeParameterSignature)
          Extracts the class and interface bounds from the given formal type parameter signature.

static char[][] getTypeParameters (char[] methodOrTypeSignature)
          Extracts the type parameter signatures from the given method or type signature.

static String[] getTypeParameters ( String methodOrTypeSignature)
          Extracts the type parameter signatures from the given method or type signature.

static int getTypeSignatureKind (char[] typeSignature)
          Returns the kind of type signature encoded by the given string.

static int getTypeSignatureKind ( String typeSignature)
          Returns the kind of type signature encoded by the given string.

static char[] getTypeVariable (char[] formalTypeParameterSignature)
          Extracts the type variable name from the given formal type parameter signature.

static String getTypeVariable ( String formalTypeParameterSignature)
          Extracts the type variable name from the given formal type parameter signature.

static char[] removeCapture (char[] methodOrTypeSignature)
          Removes any capture information from the given type or method signature and returns the resulting signature.

static String removeCapture ( String methodOrTypeSignature)
          Removes any capture information from the given type or method signature and returns the resulting signature.

static char[] toCharArray (char[] signature)
          Converts the given type signature to a readable string.

static char[] toCharArray (char[] methodSignature, char[] methodName, char[][] parameterNames, boolean fullyQualifyTypeNames, boolean includeReturnType)
          Converts the given method signature to a readable form.

static char[] toCharArray (char[] methodSignature, char[] methodName, char[][] parameterNames, boolean fullyQualifyTypeNames, boolean includeReturnType, boolean isVargArgs)
          Converts the given method signature to a readable form.

static char[] toQualifiedName (char[][] segments)
          Converts the given array of qualified name segments to a qualified name.

static String toQualifiedName ( String[] segments)
          Converts the given array of qualified name segments to a qualified name.

static String toString ( String signature)
          Converts the given type signature to a readable string.

static String toString ( String methodSignature, String methodName, String[] parameterNames, boolean fullyQualifyTypeNames, boolean includeReturnType)
          Converts the given method signature to a readable string.

static String toString ( String methodSignature, String methodName, String[] parameterNames, boolean fullyQualifyTypeNames, boolean includeReturnType, boolean isVarArgs)
          Converts the given method signature to a readable string.

Methods inherited from class java.lang. Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

C_BOOLEAN

public static final char C_BOOLEAN

Character constant indicating the primitive type boolean in a signature. Value is 'Z'.

See Also:: Constant Field Values

C_BYTE

public static final char C_BYTE

Character constant indicating the primitive type byte in a signature. Value is 'B'.

See Also:: Constant Field Values

C_CHAR

public static final char C_CHAR

Character constant indicating the primitive type char in a signature. Value is 'C'.

See Also:: Constant Field Values

C_DOUBLE

public static final char C_DOUBLE

Character constant indicating the primitive type double in a signature. Value is 'D'.

See Also:: Constant Field Values

C_FLOAT

public static final char C_FLOAT

Character constant indicating the primitive type float in a signature. Value is 'F'.

See Also:: Constant Field Values

C_INT

public static final char C_INT

Character constant indicating the primitive type int in a signature. Value is 'I'.

See Also:: Constant Field Values

C_SEMICOLON

public static final char C_SEMICOLON

Character constant indicating the semicolon in a signature. Value is ';'.

See Also:: Constant Field Values

C_COLON

public static final char C_COLON

Character constant indicating the colon in a signature. Value is ':'.

Since:: 3.0
See Also:: Constant Field Values

C_LONG

public static final char C_LONG

Character constant indicating the primitive type long in a signature. Value is 'J'.

See Also:: Constant Field Values

C_SHORT

public static final char C_SHORT

Character constant indicating the primitive type short in a signature. Value is 'S'.

See Also:: Constant Field Values

C_VOID

public static final char C_VOID

Character constant indicating result type void in a signature. Value is 'V'.

See Also:: Constant Field Values

C_TYPE_VARIABLE

public static final char C_TYPE_VARIABLE

Character constant indicating the start of a resolved type variable in a signature. Value is 'T'.

Since:: 3.0
See Also:: Constant Field Values

C_STAR

public static final char C_STAR

Character constant indicating an unbound wildcard type argument in a signature. Value is '*'.

Since:: 3.0
See Also:: Constant Field Values

C_EXCEPTION_START

public static final char C_EXCEPTION_START

Character constant indicating an exception in a signature. Value is '^'.

Since:: 3.1
See Also:: Constant Field Values

C_EXTENDS

public static final char C_EXTENDS

Character constant indicating a bound wildcard type argument in a signature with extends clause. Value is '+'.

Since:: 3.1
See Also:: Constant Field Values

C_SUPER

public static final char C_SUPER

Character constant indicating a bound wildcard type argument in a signature with super clause. Value is '-'.

Since:: 3.1
See Also:: Constant Field Values

C_DOT

public static final char C_DOT

Character constant indicating the dot in a signature. Value is '.'.

See Also:: Constant Field Values

C_DOLLAR

public static final char C_DOLLAR

Character constant indicating the dollar in a signature. Value is '$'.

See Also:: Constant Field Values

C_ARRAY

public static final char C_ARRAY

Character constant indicating an array type in a signature. Value is '['.

See Also:: Constant Field Values

C_RESOLVED

public static final char C_RESOLVED

Character constant indicating the start of a resolved, named type in a signature. Value is 'L'.

See Also:: Constant Field Values

C_UNRESOLVED

public static final char C_UNRESOLVED

Character constant indicating the start of an unresolved, named type in a signature. Value is 'Q'.

See Also:: Constant Field Values

C_NAME_END

public static final char C_NAME_END

Character constant indicating the end of a named type in a signature. Value is ';'.

See Also:: Constant Field Values

C_PARAM_START

public static final char C_PARAM_START

Character constant indicating the start of a parameter type list in a signature. Value is '('.

See Also:: Constant Field Values

C_PARAM_END

public static final char C_PARAM_END

Character constant indicating the end of a parameter type list in a signature. Value is ')'.

See Also:: Constant Field Values

C_GENERIC_START

public static final char C_GENERIC_START

Character constant indicating the start of a formal type parameter (or type argument) list in a signature. Value is '<'.

Since:: 3.0
See Also:: Constant Field Values

C_GENERIC_END

public static final char C_GENERIC_END

Character constant indicating the end of a generic type list in a signature. Value is '>'.

Since:: 3.0
See Also:: Constant Field Values

C_CAPTURE

public static final char C_CAPTURE

Character constant indicating a capture of a wildcard type in a signature. Value is '!'.

Since:: 3.1
See Also:: Constant Field Values

SIG_BOOLEAN

public static final 
String SIG_BOOLEAN

String constant for the signature of the primitive type boolean. Value is "Z".

See Also:: Constant Field Values

SIG_BYTE

public static final 
String SIG_BYTE

String constant for the signature of the primitive type byte. Value is "B".

See Also:: Constant Field Values

SIG_CHAR

public static final 
String SIG_CHAR

String constant for the signature of the primitive type char. Value is "C".

See Also:: Constant Field Values

SIG_DOUBLE

public static final 
String SIG_DOUBLE

String constant for the signature of the primitive type double. Value is "D".

See Also:: Constant Field Values

SIG_FLOAT

public static final 
String SIG_FLOAT

String constant for the signature of the primitive type float. Value is "F".

See Also:: Constant Field Values

SIG_INT

public static final 
String SIG_INT

String constant for the signature of the primitive type int. Value is "I".

See Also:: Constant Field Values

SIG_LONG

public static final 
String SIG_LONG

String constant for the signature of the primitive type long. Value is "J".

See Also:: Constant Field Values

SIG_SHORT

public static final 
String SIG_SHORT

String constant for the signature of the primitive type short. Value is "S".

See Also:: Constant Field Values

SIG_VOID

public static final 
String SIG_VOID

String constant for the signature of result type void. Value is "V".

See Also:: Constant Field Values

CLASS_TYPE_SIGNATURE

public static final int CLASS_TYPE_SIGNATURE

Kind constant for a class type signature.

Since:: 3.0
See Also:: getTypeSignatureKind(String), Constant Field Values

BASE_TYPE_SIGNATURE

public static final int BASE_TYPE_SIGNATURE

Kind constant for a base (primitive or void) type signature.

Since:: 3.0
See Also:: getTypeSignatureKind(String), Constant Field Values

TYPE_VARIABLE_SIGNATURE

public static final int TYPE_VARIABLE_SIGNATURE

Kind constant for a type variable signature.

Since:: 3.0
See Also:: getTypeSignatureKind(String), Constant Field Values

ARRAY_TYPE_SIGNATURE

public static final int ARRAY_TYPE_SIGNATURE

Kind constant for an array type signature.

Since:: 3.0
See Also:: getTypeSignatureKind(String), Constant Field Values

WILDCARD_TYPE_SIGNATURE

public static final int WILDCARD_TYPE_SIGNATURE

Kind constant for a wildcard type signature.

Since:: 3.1
See Also:: getTypeSignatureKind(String), Constant Field Values

CAPTURE_TYPE_SIGNATURE

public static final int CAPTURE_TYPE_SIGNATURE

Kind constant for the capture of a wildcard type signature.

Since:: 3.1
See Also:: getTypeSignatureKind(String), Constant Field Values

Method Detail

createArraySignature

public static char[] createArraySignature(char[] typeSignature,
                                          int arrayCount)

Creates a new type signature with the given amount of array nesting added to the given type signature.

Parameters:: typeSignature - the type signature; arrayCount - the desired number of levels of array nesting
Returns:: the encoded array type signature
Since:: 2.0

createArraySignature

public static 
String createArraySignature(
String typeSignature,
                                          int arrayCount)

Creates a new type signature with the given amount of array nesting added to the given type signature.

Parameters:: typeSignature - the type signature; arrayCount - the desired number of levels of array nesting
Returns:: the encoded array type signature

createMethodSignature

public static char[] createMethodSignature(char[][] parameterTypes,
                                           char[] returnType)

Creates a method signature from the given parameter and return type signatures. The encoded method signature is dot-based.

Parameters:: parameterTypes - the list of parameter type signatures; returnType - the return type signature
Returns:: the encoded method signature
Since:: 2.0

createMethodSignature

public static 
String createMethodSignature(
String[] parameterTypes,
                                           
String returnType)

Creates a method signature from the given parameter and return type signatures. The encoded method signature is dot-based. This method is equivalent to createMethodSignature(parameterTypes, returnType).

Parameters:: parameterTypes - the list of parameter type signatures; returnType - the return type signature
Returns:: the encoded method signature
See Also:: createMethodSignature(char[][], char[])

createTypeParameterSignature

public static char[] createTypeParameterSignature(char[] typeParameterName,
                                                  char[][] boundSignatures)

Creates a new type parameter signature with the given name and bounds.

Parameters:: typeParameterName - the type parameter name; boundSignatures - the signatures of associated bounds or empty array if none
Returns:: the encoded type parameter signature
Since:: 3.1

createTypeParameterSignature

public static 
String createTypeParameterSignature(
String typeParameterName,
                                                  
String[] boundSignatures)

Creates a new type parameter signature with the given name and bounds.

Parameters:: typeParameterName - the type parameter name; boundSignatures - the signatures of associated bounds or empty array if none
Returns:: the encoded type parameter signature
Since:: 3.1

createTypeSignature

public static 
String createTypeSignature(char[] typeName,
                                         boolean isResolved)

Creates a new type signature from the given type name encoded as a character array. The type name may contain primitive types, array types or parameterized types. This method is equivalent to createTypeSignature(new String(typeName),isResolved), although more efficient for callers with character arrays rather than strings. If the type name is qualified, then it is expected to be dot-based.

Parameters:: typeName - the possibly qualified type name; isResolved - true if the type name is to be considered resolved (for example, a type name from a binary class file), and false if the type name is to be considered unresolved (for example, a type name found in source code)
Returns:: the encoded type signature
See Also:: createTypeSignature(java.lang.String,boolean)

createCharArrayTypeSignature

public static char[] createCharArrayTypeSignature(char[] typeName,
                                                  boolean isResolved)

Creates a new type signature from the given type name encoded as a character array. The type name may contain primitive types or array types or parameterized types. This method is equivalent to createTypeSignature(new String(typeName),isResolved).toCharArray(), although more efficient for callers with character arrays rather than strings. If the type name is qualified, then it is expected to be dot-based.

Parameters:: typeName - the possibly qualified type name; isResolved - true if the type name is to be considered resolved (for example, a type name from a binary class file), and false if the type name is to be considered unresolved (for example, a type name found in source code)
Returns:: the encoded type signature
Since:: 2.0
See Also:: createTypeSignature(java.lang.String,boolean)

createTypeSignature

public static 
String createTypeSignature(
String typeName,
                                         boolean isResolved)

Creates a new type signature from the given type name. If the type name is qualified, then it is expected to be dot-based. The type name may contain primitive types or array types. However, parameterized types are not supported.

For example:

 
 createTypeSignature("int", hucairz) -> "I"
 createTypeSignature("java.lang.String", true) -> "Ljava.lang.String;"
 createTypeSignature("String", false) -> "QString;"
 createTypeSignature("java.lang.String", false) -> "Qjava.lang.String;"
 createTypeSignature("int []", false) -> "[I"

Parameters:: typeName - the possibly qualified type name; isResolved - true if the type name is to be considered resolved (for example, a type name from a binary class file), and false if the type name is to be considered unresolved (for example, a type name found in source code)
Returns:: the encoded type signature

getArrayCount

public static int getArrayCount(char[] typeSignature)
                         throws 
IllegalArgumentException

Returns the array count (array nesting depth) of the given type signature.

Parameters:: typeSignature - the type signature
Returns:: the array nesting depth, or 0 if not an array
Throws:: IllegalArgumentException - if the signature is not syntactically correct
Since:: 2.0

getArrayCount

public static int getArrayCount(
String typeSignature)
                         throws 
IllegalArgumentException

Returns the array count (array nesting depth) of the given type signature.

Parameters:: typeSignature - the type signature
Returns:: the array nesting depth, or 0 if not an array
Throws:: IllegalArgumentException - if the signature is not syntactically correct

getElementType

public static char[] getElementType(char[] typeSignature)
                             throws 
IllegalArgumentException

Returns the type signature without any array nesting.

For example:

 
 getElementType({'[', '[', 'I'}) --> {'I'}.

Parameters:: typeSignature - the type signature
Returns:: the type signature without arrays
Throws:: IllegalArgumentException - if the signature is not syntactically correct
Since:: 2.0

getElementType

public static 
String getElementType(
String typeSignature)
                             throws 
IllegalArgumentException

Returns the type signature without any array nesting.

For example:

 
 getElementType("[[I") --> "I".

Parameters:: typeSignature - the type signature
Returns:: the type signature without arrays
Throws:: IllegalArgumentException - if the signature is not syntactically correct

getParameterCount

public static int getParameterCount(char[] methodSignature)
                             throws 
IllegalArgumentException

Returns the number of parameter types in the given method signature.

Parameters:: methodSignature - the method signature
Returns:: the number of parameters
Throws:: IllegalArgumentException - if the signature is not syntactically correct
Since:: 2.0

getTypeSignatureKind

public static int getTypeSignatureKind(char[] typeSignature)

Returns the kind of type signature encoded by the given string.

Parameters:: typeSignature - the type signature string
Returns:: the kind of type signature; one of the kind constants: ARRAY_TYPE_SIGNATURE, CLASS_TYPE_SIGNATURE, BASE_TYPE_SIGNATURE, or TYPE_VARIABLE_SIGNATURE, or (since 3.1) WILDCARD_TYPE_SIGNATURE or CAPTURE_TYPE_SIGNATURE
Throws:: IllegalArgumentException - if this is not a type signature
Since:: 3.0

getTypeSignatureKind

public static int getTypeSignatureKind(
String typeSignature)

Returns the kind of type signature encoded by the given string.

Parameters:: typeSignature - the type signature string
Returns:: the kind of type signature; one of the kind constants: ARRAY_TYPE_SIGNATURE, CLASS_TYPE_SIGNATURE, BASE_TYPE_SIGNATURE, or TYPE_VARIABLE_SIGNATURE, or (since 3.1) WILDCARD_TYPE_SIGNATURE or CAPTURE_TYPE_SIGNATURE
Throws:: IllegalArgumentException - if this is not a type signature
Since:: 3.0

getParameterCount

public static int getParameterCount(
String methodSignature)
                             throws 
IllegalArgumentException

Returns the number of parameter types in the given method signature.

Parameters:: methodSignature - the method signature
Returns:: the number of parameters
Throws:: IllegalArgumentException - if the signature is not syntactically correct

getParameterTypes

public static char[][] getParameterTypes(char[] methodSignature)
                                  throws 
IllegalArgumentException

Extracts the parameter type signatures from the given method signature. The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature
Returns:: the list of parameter type signatures
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 2.0

getParameterTypes

public static 
String[] getParameterTypes(
String methodSignature)
                                  throws 
IllegalArgumentException

Extracts the parameter type signatures from the given method signature. The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature
Returns:: the list of parameter type signatures
Throws:: IllegalArgumentException - if the signature is syntactically incorrect

getThrownExceptionTypes

public static 
String[] getThrownExceptionTypes(
String methodSignature)
                                        throws 
IllegalArgumentException

Extracts the thrown exception type signatures from the given method signature if any The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature
Returns:: the list of thrown exception type signatures
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getThrownExceptionTypes

public static char[][] getThrownExceptionTypes(char[] methodSignature)
                                        throws 
IllegalArgumentException

Extracts the thrown exception type signatures from the given method signature if any The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature
Returns:: the list of thrown exception type signatures
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeArguments

public static char[][] getTypeArguments(char[] parameterizedTypeSignature)
                                 throws 
IllegalArgumentException

Extracts the type argument signatures from the given type signature. Returns an empty array if the type signature is not a parameterized type signature.

Parameters:: parameterizedTypeSignature - the parameterized type signature
Returns:: the signatures of the type arguments
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeArguments

public static 
String[] getTypeArguments(
String parameterizedTypeSignature)
                                 throws 
IllegalArgumentException

Extracts the type argument signatures from the given type signature. Returns an empty array if the type signature is not a parameterized type signature.

Parameters:: parameterizedTypeSignature - the parameterized type signature
Returns:: the signatures of the type arguments
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeErasure

public static char[] getTypeErasure(char[] parameterizedTypeSignature)
                             throws 
IllegalArgumentException

Extracts the type erasure signature from the given parameterized type signature. Returns the given type signature if it is not parameterized.

Parameters:: parameterizedTypeSignature - the parameterized type signature
Returns:: the signature of the type erasure
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeErasure

public static 
String getTypeErasure(
String parameterizedTypeSignature)
                             throws 
IllegalArgumentException

Extracts the type erasure signature from the given parameterized type signature. Returns the given type signature if it is not parameterized.

Parameters:: parameterizedTypeSignature - the parameterized type signature
Returns:: the signature of the type erasure
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeParameters

public static char[][] getTypeParameters(char[] methodOrTypeSignature)
                                  throws 
IllegalArgumentException

Extracts the type parameter signatures from the given method or type signature. The method or type signature is expected to be dot-based.

Parameters:: methodOrTypeSignature - the method or type signature
Returns:: the list of type parameter signatures
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeParameters

public static 
String[] getTypeParameters(
String methodOrTypeSignature)
                                  throws 
IllegalArgumentException

Extracts the type parameter signatures from the given method or type signature. The method or type signature is expected to be dot-based.

Parameters:: methodOrTypeSignature - the method or type signature
Returns:: the list of type parameter signatures
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.1

getTypeVariable

public static 
String getTypeVariable(
String formalTypeParameterSignature)
                              throws 
IllegalArgumentException

Extracts the type variable name from the given formal type parameter signature. The signature is expected to be dot-based.

Parameters:: formalTypeParameterSignature - the formal type parameter signature
Returns:: the name of the type variable
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.0

getTypeVariable

public static char[] getTypeVariable(char[] formalTypeParameterSignature)
                              throws 
IllegalArgumentException

Extracts the type variable name from the given formal type parameter signature. The signature is expected to be dot-based.

Parameters:: formalTypeParameterSignature - the formal type parameter signature
Returns:: the name of the type variable
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.0

getTypeParameterBounds

public static char[][] getTypeParameterBounds(char[] formalTypeParameterSignature)
                                       throws 
IllegalArgumentException

Extracts the class and interface bounds from the given formal type parameter signature. The class bound, if present, is listed before the interface bounds. The signature is expected to be dot-based.

Parameters:: formalTypeParameterSignature - the formal type parameter signature
Returns:: the (possibly empty) list of type signatures for the bounds
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.0

getTypeParameterBounds

public static 
String[] getTypeParameterBounds(
String formalTypeParameterSignature)
                                       throws 
IllegalArgumentException

Extracts the class and interface bounds from the given formal type parameter signature. The class bound, if present, is listed before the interface bounds. The signature is expected to be dot-based.

Parameters:: formalTypeParameterSignature - the formal type parameter signature
Returns:: the (possibly empty) list of type signatures for the bounds
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 3.0

getQualifier

public static char[] getQualifier(char[] name)

Returns a char array containing all but the last segment of the given dot-separated qualified name. Returns the empty char array if it is not qualified.

For example:

 
 getQualifier({'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'O', 'b', 'j', 'e', 'c', 't'}) -> {'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g'}
 getQualifier({'O', 'u', 't', 'e', 'r', '.', 'I', 'n', 'n', 'e', 'r'}) -> {'O', 'u', 't', 'e', 'r'}
 getQualifier({'j', 'a', 'v', 'a', '.', 'u', 't', 'i', 'l', '.', 'L', 'i', 's', 't', '<', 'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'S', 't', 'r', 'i', 'n', 'g', '>'}) -> {'j', 'a', 'v', 'a', '.', 'u', 't', 'i', 'l'}

Parameters:: name - the name
Returns:: the qualifier prefix, or the empty char array if the name contains no dots
Throws:: NullPointerException - if name is null
Since:: 2.0

getQualifier

public static 
String getQualifier(
String name)

Returns a string containing all but the last segment of the given dot-separated qualified name. Returns the empty string if it is not qualified.

For example:

 
 getQualifier("java.lang.Object") -> "java.lang"
 getQualifier("Outer.Inner") -> "Outer"
 getQualifier("java.util.List<java.lang.String>") -> "java.util"

Parameters:: name - the name
Returns:: the qualifier prefix, or the empty string if the name contains no dots
Throws:: NullPointerException - if name is null

getReturnType

public static char[] getReturnType(char[] methodSignature)
                            throws 
IllegalArgumentException

Extracts the return type from the given method signature. The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature
Returns:: the type signature of the return type
Throws:: IllegalArgumentException - if the signature is syntactically incorrect
Since:: 2.0

getReturnType

public static 
String getReturnType(
String methodSignature)
                            throws 
IllegalArgumentException

Extracts the return type from the given method signature. The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature
Returns:: the type signature of the return type
Throws:: IllegalArgumentException - if the signature is syntactically incorrect

getSignatureQualifier

public static char[] getSignatureQualifier(char[] typeSignature)

Returns package fragment of a type signature. The package fragment separator must be '.' and the type fragment separator must be '$'.

For example:

 
 getSignatureQualifier({'L', 'j', 'a', 'v', 'a', '.', 'u', 't', 'i', 'l', '.', 'M', 'a', 'p', '$', 'E', 'n', 't', 'r', 'y', ';'}) -> {'j', 'a', 'v', 'a', '.', 'u', 't', 'i', 'l'}

Parameters:: typeSignature - the type signature
Returns:: the package fragment (separators are '.')
Since:: 3.1

getSignatureQualifier

public static 
String getSignatureQualifier(
String typeSignature)

Returns package fragment of a type signature. The package fragment separator must be '.' and the type fragment separator must be '$'.

For example:

 
 getSignatureQualifier("Ljava.util.Map$Entry") -> "java.util"

Parameters:: typeSignature - the type signature
Returns:: the package fragment (separators are '.')
Since:: 3.1

getSignatureSimpleName

public static char[] getSignatureSimpleName(char[] typeSignature)

Returns type fragment of a type signature. The package fragment separator must be '.' and the type fragment separator must be '$'.

For example:

 
 getSignatureSimpleName({'L', 'j', 'a', 'v', 'a', '.', 'u', 't', 'i', 'l', '.', 'M', 'a', 'p', '$', 'E', 'n', 't', 'r', 'y', ';'}) -> {'M', 'a', 'p', '.', 'E', 'n', 't', 'r', 'y'}

Parameters:: typeSignature - the type signature
Returns:: the type fragment (separators are '.')
Since:: 3.1

getSignatureSimpleName

public static 
String getSignatureSimpleName(
String typeSignature)

Returns type fragment of a type signature. The package fragment separator must be '.' and the type fragment separator must be '$'.

For example:

 
 getSignatureSimpleName("Ljava.util.Map$Entry") -> "Map.Entry"

Parameters:: typeSignature - the type signature
Returns:: the type fragment (separators are '.')
Since:: 3.1

getSimpleName

public static char[] getSimpleName(char[] name)

Returns the last segment of the given dot-separated qualified name. Returns the given name if it is not qualified.

For example:

 
 getSimpleName({'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'O', 'b', 'j', 'e', 'c', 't'}) -> {'O', 'b', 'j', 'e', 'c', 't'}

Parameters:: name - the name
Returns:: the last segment of the qualified name
Throws:: NullPointerException - if name is null
Since:: 2.0

getSimpleName

public static 
String getSimpleName(
String name)

Returns the last segment of the given dot-separated qualified name. Returns the given name if it is not qualified.

For example:

 
 getSimpleName("java.lang.Object") -> "Object"
 
 
 getSimpleName("java.util.Map<java.lang.String, java.lang.Object>") -> "Map<String,Object>"

Parameters:: name - the name
Returns:: the last segment of the qualified name
Throws:: NullPointerException - if name is null

getSimpleNames

public static char[][] getSimpleNames(char[] name)

Returns all segments of the given dot-separated qualified name. Returns an array with only the given name if it is not qualified. Returns an empty array if the name is empty.

For example:

 
 getSimpleNames({'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'O', 'b', 'j', 'e', 'c', 't'}) -> {{'j', 'a', 'v', 'a'}, {'l', 'a', 'n', 'g'}, {'O', 'b', 'j', 'e', 'c', 't'}}
 getSimpleNames({'O', 'b', 'j', 'e', 'c', 't'}) -> {{'O', 'b', 'j', 'e', 'c', 't'}}
 getSimpleNames({}) -> {}
 getSimpleNames({'j', 'a', 'v', 'a', '.', 'u', 't', 'i', 'l', '.', 'L', 'i', 's', 't', '<', 'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'S', 't', 'r', 'i', 'n', 'g', '>'}) -> {{'j', 'a', 'v', 'a'}, {'l', 'a', 'n', 'g'}, {'L', 'i', 's', 't', '<', 'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'S', 't', 'r', 'i', 'n', 'g'}}

Parameters:: name - the name
Returns:: the list of simple names, possibly empty
Throws:: NullPointerException - if name is null
Since:: 2.0

getSimpleNames

public static 
String[] getSimpleNames(
String name)

Returns all segments of the given dot-separated qualified name. Returns an array with only the given name if it is not qualified. Returns an empty array if the name is empty.

For example:

 
 getSimpleNames("java.lang.Object") -> {"java", "lang", "Object"}
 getSimpleNames("Object") -> {"Object"}
 getSimpleNames("") -> {}
 getSimpleNames("java.util.List<java.lang.String>") ->
   {"java", "util", "List<java.lang.String>"}

Parameters:: name - the name
Returns:: the list of simple names, possibly empty
Throws:: NullPointerException - if name is null

removeCapture

public static char[] removeCapture(char[] methodOrTypeSignature)

Removes any capture information from the given type or method signature and returns the resulting signature. Returns the type or method signature itself if no capture information is present.

For example (using equivalent string-based method):

 
 removeCapture("LTest<!+Ljava.lang.Throwable;>;")
 will return: "LTest<+Ljava.lang.Throwable;>;"

Parameters:: methodOrTypeSignature - the signature which may have been captured
Returns:: a new signature without capture information or the signature itself if no specific capture information is present
Throws:: NullPointerException - if methodOrTypeSignature is null
Since:: 3.1

removeCapture

public static 
String removeCapture(
String methodOrTypeSignature)

Removes any capture information from the given type or method signature and returns the resulting signature. Returns the type or method signature itself if no capture information is present.

For example:

 
 removeCapture("LTest<!+Ljava.lang.Throwable;>;")
 will return: "LTest<+Ljava.lang.Throwable;>;"

Parameters:: methodOrTypeSignature - the signature which may have been captured
Returns:: a new signature without capture information or the signature itself if no specific capture information is present
Throws:: NullPointerException - if methodOrTypeSignature is null
Since:: 3.1

toCharArray

public static char[] toCharArray(char[] methodSignature,
                                 char[] methodName,
                                 char[][] parameterNames,
                                 boolean fullyQualifyTypeNames,
                                 boolean includeReturnType)

Converts the given method signature to a readable form. The method signature is expected to be dot-based.

For example:

 
 toString("([Ljava.lang.String;)V", "main", new String[] {"args"}, false, true) -> "void main(String[] args)"

Parameters:: methodSignature - the method signature to convert; methodName - the name of the method to insert in the result, or null if no method name is to be included; parameterNames - the parameter names to insert in the result, or null if no parameter names are to be included; if supplied, the number of parameter names must match that of the method signature; fullyQualifyTypeNames - true if type names should be fully qualified, and false to use only simple names; includeReturnType - true if the return type is to be included
Returns:: the char array representation of the method signature
Since:: 2.0

toCharArray

public static char[] toCharArray(char[] methodSignature,
                                 char[] methodName,
                                 char[][] parameterNames,
                                 boolean fullyQualifyTypeNames,
                                 boolean includeReturnType,
                                 boolean isVargArgs)

Converts the given method signature to a readable form. The method signature is expected to be dot-based.

For example:

 
 toString("([Ljava.lang.String;)V", "main", new String[] {"args"}, false, true) -> "void main(String[] args)"

Parameters:: methodSignature - the method signature to convert; methodName - the name of the method to insert in the result, or null if no method name is to be included; parameterNames - the parameter names to insert in the result, or null if no parameter names are to be included; if supplied, the number of parameter names must match that of the method signature; fullyQualifyTypeNames - true if type names should be fully qualified, and false to use only simple names; includeReturnType - true if the return type is to be included; isVargArgs - true if the last argument should be displayed as a variable argument, false otherwise.
Returns:: the char array representation of the method signature
Since:: 3.1

toCharArray

public static char[] toCharArray(char[] signature)
                          throws 
IllegalArgumentException

Converts the given type signature to a readable string. The signature is expected to be dot-based.

For example:

 
 toString({'[', 'L', 'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'S', 't', 'r', 'i', 'n', 'g', ';'}) -> {'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'S', 't', 'r', 'i', 'n', 'g', '[', ']'}
 toString({'I'}) -> {'i', 'n', 't'}
 toString({'+', 'L', 'O', 'b', 'j', 'e', 'c', 't', ';'}) -> {'?', ' ', 'e', 'x', 't', 'e', 'n', 'd', 's', ' ', 'O', 'b', 'j', 'e', 'c', 't'}

Note: This method assumes that a type signature containing a '$' is an inner type signature. While this is correct in most cases, someone could define a non-inner type name containing a '$'. Handling this correctly in all cases would have required resolving the signature, which generally not feasible.

Parameters:: signature - the type signature
Returns:: the string representation of the type
Throws:: IllegalArgumentException - if the signature is not syntactically correct
Since:: 2.0

toQualifiedName

public static char[] toQualifiedName(char[][] segments)

Converts the given array of qualified name segments to a qualified name.

For example:

 
 toQualifiedName({{'j', 'a', 'v', 'a'}, {'l', 'a', 'n', 'g'}, {'O', 'b', 'j', 'e', 'c', 't'}}) -> {'j', 'a', 'v', 'a', '.', 'l', 'a', 'n', 'g', '.', 'O', 'b', 'j', 'e', 'c', 't'}
 toQualifiedName({{'O', 'b', 'j', 'e', 'c', 't'}}) -> {'O', 'b', 'j', 'e', 'c', 't'}
 toQualifiedName({{}}) -> {}

Parameters:: segments - the list of name segments, possibly empty
Returns:: the dot-separated qualified name, or the empty string
Since:: 2.0

toQualifiedName

public static 
String toQualifiedName(
String[] segments)

Converts the given array of qualified name segments to a qualified name.

For example:

 
 toQualifiedName(new String[] {"java", "lang", "Object"}) -> "java.lang.Object"
 toQualifiedName(new String[] {"Object"}) -> "Object"
 toQualifiedName(new String[0]) -> ""

Parameters:: segments - the list of name segments, possibly empty
Returns:: the dot-separated qualified name, or the empty string

toString

public static 
String toString(
String signature)
                       throws 
IllegalArgumentException

Converts the given type signature to a readable string. The signature is expected to be dot-based.

For example:

 
 toString("[Ljava.lang.String;") -> "java.lang.String[]"
 toString("I") -> "int"
 toString("+QObject;") -> "? extends Object"

Parameters:: signature - the type signature
Returns:: the string representation of the type
Throws:: IllegalArgumentException - if the signature is not syntactically correct

toString

public static 
String toString(
String methodSignature,
                              
String methodName,
                              
String[] parameterNames,
                              boolean fullyQualifyTypeNames,
                              boolean includeReturnType)

Converts the given method signature to a readable string. The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature to convert; methodName - the name of the method to insert in the result, or null if no method name is to be included; parameterNames - the parameter names to insert in the result, or null if no parameter names are to be included; if supplied, the number of parameter names must match that of the method signature; fullyQualifyTypeNames - true if type names should be fully qualified, and false to use only simple names; includeReturnType - true if the return type is to be included
Returns:: the string representation of the method signature
See Also:: toCharArray(char[], char[], char[][], boolean, boolean)

toString

public static 
String toString(
String methodSignature,
                              
String methodName,
                              
String[] parameterNames,
                              boolean fullyQualifyTypeNames,
                              boolean includeReturnType,
                              boolean isVarArgs)

Converts the given method signature to a readable string. The method signature is expected to be dot-based.

Parameters:: methodSignature - the method signature to convert; methodName - the name of the method to insert in the result, or null if no method name is to be included; parameterNames - the parameter names to insert in the result, or null if no parameter names are to be included; if supplied, the number of parameter names must match that of the method signature; fullyQualifyTypeNames - true if type names should be fully qualified, and false to use only simple names; includeReturnType - true if the return type is to be included; isVarArgs - true if the last argument should be displayed as a variable argument, false otherwise
Returns:: the string representation of the method signature
Since:: 3.1
See Also:: toCharArray(char[], char[], char[][], boolean, boolean)

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getTypeParameters

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org.eclipse.jdt.core
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