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Eclipse Platform
Release 3.5

org.eclipse.core.runtime.content
Class XMLRootElementContentDescriber2

java.lang.Object
  extended by org.eclipse.core.internal.content.TextContentDescriber
      extended by 

org.eclipse.core.runtime.content.XMLContentDescriber
          extended by 
org.eclipse.core.runtime.content.XMLRootElementContentDescriber2
All Implemented Interfaces:
IContentDescriber, ITextContentDescriber, IExecutableExtension

public final class XMLRootElementContentDescriber2
extends XMLContentDescriber
implements IExecutableExtension

A content describer for detecting the name of the top-level element, its namespace and the DTD system identifier in an XML file.

This executable extension supports "element" parameter, that can be specified more than once. If the ":-" method is used, then the value is treated as "element" (always just one)

The value of "element" is specified using such a format {namespace}name/dtd. The namespace or dtd part can be omitted and accepted are values like name/dtd, {ns}name and name.

The describer will detect a document, if it matches at least one "element" what means, that dtd, namespace (if specified) and name in "element" match those in the document.

If the "element" name part is "*", e.g. {namespace}*, it denotes a wildcard match. If the "element" namespace part is empty, e.g. {}name, only these documents with the root element that belong to the unnamed namespace will be detected.

This class should be used instead of XMLRootElementContentDescriber which doesn't detect namespaces and doesn't allow to specify more than one set of dtds, root element names and namespaces which should be detected.

This class is not intended to be subclassed or instantiated by clients, only to be referenced by the "describer" configuration element in extensions to the org.eclipse.core.runtime.contentTypes extension point.

Since:
org.eclipse.core.contenttype 3.3

Field Summary
 
Fields inherited from interface org.eclipse.core.runtime.content. IContentDescriber
INDETERMINATE, INVALID, VALID
 
Constructor Summary
XMLRootElementContentDescriber2 ()
           
 
Method Summary
 int describe ( InputStream contents, IContentDescription description)
          Tries to fill a description for the given contents.
 int describe ( Reader contents, IContentDescription description)
          Tries to fill a description for the given contents.
 void setInitializationData ( IConfigurationElement config, String propertyName, Object data)
          This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information.
 
Methods inherited from class org.eclipse.core.runtime.content. XMLContentDescriber
getSupportedOptions
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

XMLRootElementContentDescriber2

public XMLRootElementContentDescriber2()
Method Detail

describe

public int describe(
InputStream contents,
                    
IContentDescription description)
             throws 
IOException
Description copied from interface: IContentDescriber
Tries to fill a description for the given contents. Returns an int indicating whether the given stream of bytes represents a valid sample for its corresponding content type. If no content description is provided, this method should perform content type validation.

The input stream must be kept open, and any IOExceptions while reading the stream should flow to the caller.

Specified by:
describe in interface IContentDescriber
Overrides:
describe in class XMLContentDescriber
Parameters:
contents - the contents to be examined
description - a description to be filled in, or null if only content type validation is to be performed
Returns:
one of the following:
  • VALID
  • ,
  • INVALID
  • ,
  • INDETERMINATE
Throws:
IOException - if an I/O error occurs
See Also:
IContentDescription, IContentDescriber.VALID, IContentDescriber.INVALID, IContentDescriber.INDETERMINATE

describe

public int describe(
Reader contents,
                    
IContentDescription description)
             throws 
IOException
Description copied from interface: ITextContentDescriber
Tries to fill a description for the given contents. Returns an int indicating whether the given stream of characters represents a valid sample for this describer's corresponding content type. If no content description is provided, this method should only perform content type validation.

The stream provided must be kept open, and any IOExceptions while reading it should flow to the caller.

Specified by:
describe in interface ITextContentDescriber
Overrides:
describe in class XMLContentDescriber
Parameters:
contents - the contents to be examined
description - a description to be filled in, or null if only content type validation is to be performed
Returns:
one of the following:
  • VALID
  • INVALID
  • INDETERMINATE
Throws:
IOException - if an I/O error occurs
See Also:
IContentDescription, IContentDescriber.VALID, IContentDescriber.INVALID, IContentDescriber.INDETERMINATE

setInitializationData

public void setInitializationData(
IConfigurationElement config,
                                  
String propertyName,
                                  
Object data)
                           throws 
CoreException
Description copied from interface: IExecutableExtension
This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information. Most executable extensions only make use of the first two call arguments.

Regular executable extensions specify their Java implementation class name as an attribute of the configuration element for the extension. For example

     <action run="com.example.BaseAction"/>
 
In the above example, this method would be called with a reference to the <action> element (first argument), and "run" as the name of the attribute that defined this executable extension (second argument).

The last parameter is for the specific use of extension adapters and is typically not used by regular executable extensions.

There are two supported ways of associating additional adapter-specific data with the configuration in a way that is transparent to the extension point implementor:

(1) by specifying adapter data as part of the implementation class attribute value. The Java class name can be followed by a ":" separator, followed by any adapter data in string form. For example, if the extension point specifies an attribute "run" to contain the name of the extension implementation, an adapter can be configured as

     <action run="com.example.ExternalAdapter:./cmds/util.exe -opt 3"/>
 

(2) by converting the attribute used to specify the executable extension to a child element of the original configuration element, and specifying the adapter data in the form of xml markup. Using this form, the example above would become

     <action>
         <run class="com.xyz.ExternalAdapter">
             <parameter name="exec" value="./cmds/util.exe"/>
             <parameter name="opt"  value="3"/>
         </run>
     </action>
 

Form (2) will typically only be used for extension points that anticipate the majority of extensions configured into it will in fact be in the form of adapters.

In either case, the specified adapter class is instantiated using its 0-argument public constructor. The adapter data is passed as the last argument of this method. The data argument is defined as Object. It can have the following values:

  • null, if no adapter data was supplied
  • in case (1), the initialization data string is passed as a String
  • in case (2), the initialization data is passed as a Hashtable containing the actual parameter names and values (both Strings)

Specified by:
setInitializationData in interface IExecutableExtension
Parameters:
config - the configuration element used to trigger this execution. It can be queried by the executable extension for specific configuration properties
propertyName - the name of an attribute of the configuration element used on the createExecutableExtension(String) call. This argument can be used in the cases where a single configuration element is used to define multiple executable extensions.
data - adapter data in the form of a String, a Hashtable, or null.
Throws:
CoreException - if error(s) detected during initialization processing
See Also:
IConfigurationElement.createExecutableExtension(String)

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire