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Eclipse Platform
Release 3.5
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org.eclipse.debug.core.model
Class MemoryByte


java.lang.Object
  extended by 
org.eclipse.debug.core.model.MemoryByte

public class MemoryByte

extends 
Object

A byte of memory in a memory block. Each byte of memory has a value and attributes indicating if the byte is read-only, valid, or if its value has changed.

Clients may instantiate this class. Clients may subclass this class to add other attributes to a memory byte, as required.

Since:
3.1
See Also:
IMemoryBlockExtension

Field Summary
static byte BIG_ENDIAN
          Bit mask used to indicate a this byte of memory is big endian.
static byte CHANGED
          Bit mask used to indicate a byte has changed since the last suspend event.
static byte ENDIANESS_KNOWN
          Bit mask used to indicate that the endianess of this byte of memory is known.
protected  byte flags
          Attribute flags.
static byte HISTORY_KNOWN
          Bit mask used to indicate a memory byte has history to determine if its value has changed.
static byte READABLE
          Bit mask used to indicate a byte is readable.
protected  byte value
          Value of this byte.
static byte WRITABLE
          Bit mask used to indicate a byte is writable.
 
Constructor Summary
MemoryByte ()
          Constructs a readable, writable memory byte without a change history, and a value of 0.
MemoryByte (byte byteValue)
          Constructs a readable, writable memory byte without a change history, with the given value.
MemoryByte (byte byteValue, byte byteFlags)
          Constructs a memory byte with the given value and attributes.
 
Method Summary
 byte getFlags ()
          Returns this memory byte's attribute as a bit mask.
 byte getValue ()
          Returns the value of this memory byte.
 boolean isBigEndian ()
          Returns whether this byte of memory is big endian.
 boolean isChanged ()
          Returns whether this memory byte has changed.
 boolean isEndianessKnown ()
          Returns whether the endianess of this byte of memory is known.
 boolean isHistoryKnown ()
          Returns whether the history of this byte is known.
 boolean isReadable ()
          Returns whether this memory byte is readable.
 boolean isWritable ()
          Returns whether this memory byte is writable.
 void setBigEndian (boolean isBigEndian)
          Sets whether this byte of memory is big endian.
 void setChanged (boolean changed)
          Sets whether this memory byte has changed.
 void setEndianessKnown (boolean isEndianessKnown)
          Sets whether the endianess of this byte of memory is known.
 void setFlags (byte flags)
          Sets this memory byte's attributes based on the given bit mask.
 void setHistoryKnown (boolean known)
          Sets whether the history of this byte is known.
 void setReadable (boolean readable)
          Sets whether this memory byte is readable.
 void setValue (byte value)
          Sets the value of this memory byte.
 void setWritable (boolean writable)
          Sets whether this memory byte is writable.
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

WRITABLE

public static final byte WRITABLE
Bit mask used to indicate a byte is writable.

See Also:
Constant Field Values

READABLE

public static final byte READABLE
Bit mask used to indicate a byte is readable. A memory byte is readable when its value and attributes are retrievable. Otherwise, a byte is considered non-readable.

See Also:
Constant Field Values

CHANGED

public static final byte CHANGED
Bit mask used to indicate a byte has changed since the last suspend event.

See Also:
DebugEvent.SUSPEND, Constant Field Values

HISTORY_KNOWN

public static final byte HISTORY_KNOWN
Bit mask used to indicate a memory byte has history to determine if its value has changed. When a memory byte's history is unknown, the change state has no meaning.

See Also:
Constant Field Values

BIG_ENDIAN

public static final byte BIG_ENDIAN
Bit mask used to indicate a this byte of memory is big endian. If this byte of memory is little endian, turn this bit mask to off.

See Also:
Constant Field Values

ENDIANESS_KNOWN

public static final byte ENDIANESS_KNOWN
Bit mask used to indicate that the endianess of this byte of memory is known. When a memory byte's endianess is unknown, the endianess of this byte has no meaning.

See Also:
Constant Field Values

value

protected byte value
Value of this byte.

flags

protected byte flags
Attribute flags.

To specify READABLE: flags |= MemoryByte.READABLE; To specify WRITABLE: flags |= MemoryByte.WRITABLE;

Constructor Detail

MemoryByte

public MemoryByte()
Constructs a readable, writable memory byte without a change history, and a value of 0. The byte's endianess is known and is little endian by default.

MemoryByte

public MemoryByte(byte byteValue)
Constructs a readable, writable memory byte without a change history, with the given value. The byte's endianess is known and is little endian by default.

Parameters:
byteValue - value of this memory byte

MemoryByte

public MemoryByte(byte byteValue,
                  byte byteFlags)
Constructs a memory byte with the given value and attributes.

Parameters:
byteValue - value of this memory byte
byteFlags - attributes of the byte specified as a bit mask
Method Detail

getFlags

public byte getFlags()
Returns this memory byte's attribute as a bit mask.

Returns:
this memory byte's attribute as a bit mask

setFlags

public void setFlags(byte flags)
Sets this memory byte's attributes based on the given bit mask.

Parameters:
flags - bit mask of attributes

getValue

public byte getValue()
Returns the value of this memory byte.

Returns:
the value of this memory byte

setValue

public void setValue(byte value)
Sets the value of this memory byte.

Parameters:
value - the new value of this memory byte

setReadable

public void setReadable(boolean readable)
Sets whether this memory byte is readable. A memory byte is considered readable when its value and attributes are retrievable.

Parameters:
readable - whether this memory byte is readable

isReadable

public boolean isReadable()
Returns whether this memory byte is readable. A memory byte is considered readable when its value and attributes are retrievable.

Returns:
whether this memory byte is readable

setWritable

public void setWritable(boolean writable)
Sets whether this memory byte is writable.

Parameters:
writable - whether this memory byte is writable.

isWritable

public boolean isWritable()
Returns whether this memory byte is writable.

Returns:
whether this memory byte is writable

setChanged

public void setChanged(boolean changed)
Sets whether this memory byte has changed.

Parameters:
changed - whether this memory byte has changed

isChanged

public boolean isChanged()
Returns whether this memory byte has changed.

Returns:
whether this memory byte has changed

setHistoryKnown

public void setHistoryKnown(boolean known)
Sets whether the history of this byte is known. When history is unknown, the change state of a memory byte has no meaning.

Parameters:
known - whether the change state of this byte is known

isHistoryKnown

public boolean isHistoryKnown()
Returns whether the history of this byte is known. When history is unknown, the change state of a memory byte has no meaning.

Returns:
whether the change state of this byte is known

setBigEndian

public void setBigEndian(boolean isBigEndian)
Sets whether this byte of memory is big endian.

Parameters:
isBigEndian - whether the byte of memory is big endian.

isBigEndian

public boolean isBigEndian()
Returns whether this byte of memory is big endian.

Returns:
whether the byte of memory is big endian.

setEndianessKnown

public void setEndianessKnown(boolean isEndianessKnown)
Sets whether the endianess of this byte of memory is known. If the endianess is unknown, the endianess of this byte has no meaning.

Parameters:
isEndianessKnown - whether the endianess of this byte is known.

isEndianessKnown

public boolean isEndianessKnown()
Returns whether the endianess of this byte of memory is known. If the endianess is unknown, the endianess of this byte has no meaning.

Returns:
whether the endianess of this byte of memory is known.
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