Xerces2 Implementation: Class XPointerHandler

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## org.apache.xerces.xpointer
Class XPointerHandler

    java.lang.Object
      |
      +--org.apache.xerces.xinclude.XIncludeHandler
            |
            +--org.apache.xerces.xpointer.XPointerHandler

All Implemented Interfaces:
  org.apache.xerces.xni.parser.XMLComponent, org.apache.xerces.xni.parser.XMLDocumentFilter, org.apache.xerces.xni.XMLDocumentHandler, org.apache.xerces.xni.parser.XMLDocumentSource, org.apache.xerces.xni.parser.XMLDTDFilter, org.apache.xerces.xni.XMLDTDHandler, org.apache.xerces.xni.parser.XMLDTDSource, XPointerProcessor

public final class XPointerHandler
extends XIncludeHandler
implements XPointerProcessor

This is a pipeline component which extends the XIncludeHandler to perform XPointer specific processing specified in the W3C XPointerFramework and element() Scheme Recommendations.

This component analyzes each event in the pipeline, looking for an element that matches a PointerPart in the parent XInclude element's xpointer attribute value. If the match succeeds, all children are passed by this component.

See the XPointer Framework Recommendation for more information on the XPointer Framework and ShortHand Pointers. See the XPointer element() Scheme Recommendation for more information on the XPointer element() Scheme.

# INTERNAL:

  Usage of this class is not supported. It may be altered or removed at any time.

Version:
  $Id: XPointerHandler.java 447248 2006-09-18 05:25:21Z mrglavas $

Inner classes inherited from class org.apache.xerces.xinclude.XIncludeHandler
`XIncludeHandler.Notation, XIncludeHandler.UnparsedEntity`

Field Summary
`protected org.apache.xerces.xni.parser.XMLErrorHandler` | `fErrorHandler`
`protected boolean` | `fFixupBase`
`protected boolean` | `fFixupLang`
`protected boolean` | `fFoundMatchingPtrPart`
`protected boolean` | `fIsXPointerResolved`
`protected SymbolTable` | `fSymbolTable`
`protected XMLErrorReporter` | `fXPointerErrorReporter`
`protected XPointerPart` | `fXPointerPart`
`protected java.util.Vector` | `fXPointerParts`

Fields inherited from class org.apache.xerces.xinclude.XIncludeHandler
`ALLOW_UE_AND_NOTATION_EVENTS, BUFFER_SIZE, CURRENT_BASE_URI, DYNAMIC_VALIDATION, ENTITY_RESOLVER, ERROR_REPORTER, fBaseURI, fBaseURIScope, fBufferSize, fChildConfig, fCurrentBaseURI, fCurrentLanguage, fDocLocation, fDocumentHandler, fDocumentSource, fDTDHandler, fDTDSource, fEntityResolver, fErrorReporter, fExpandedSystemID, fHrefFromParent, fLanguageScope, fLanguageStack, fLiteralSystemID, fNamespaceContext, fParentRelativeURI, fParentXIncludeHandler, fSecurityManager, fSettings, fXInclude10TextReader, fXInclude11TextReader, fXIncludeChildConfig, fXIncludeLocator, fXIncludeMessageFormatter, fXPointerChildConfig, fXPtrProcessor, HTTP_ACCEPT, HTTP_ACCEPT_LANGUAGE, JAXP_SCHEMA_LANGUAGE, PARSER_SETTINGS, SCHEMA_VALIDATION, SECURITY_MANAGER, SYMBOL_TABLE, VALIDATION, XINCLUDE_ATTR_ACCEPT, XINCLUDE_ATTR_ACCEPT_LANGUAGE, XINCLUDE_ATTR_ENCODING, XINCLUDE_ATTR_HREF, XINCLUDE_ATTR_PARSE, XINCLUDE_DEFAULT_CONFIGURATION, XINCLUDE_FALLBACK, XINCLUDE_FIXUP_BASE_URIS, XINCLUDE_FIXUP_LANGUAGE, XINCLUDE_INCLUDE, XINCLUDE_INCLUDED, XINCLUDE_NS_URI, XINCLUDE_PARSE_TEXT, XINCLUDE_PARSE_XML, XPOINTER`

Fields inherited from interface org.apache.xerces.xpointer.XPointerProcessor
`EVENT_ELEMENT_EMPTY, EVENT_ELEMENT_END, EVENT_ELEMENT_START`

Fields inherited from interface org.apache.xerces.xni.XMLDTDHandler
`CONDITIONAL_IGNORE, CONDITIONAL_INCLUDE`

Constructor Summary
`XPointerHandler()`
`XPointerHandler(SymbolTable symbolTable, org.apache.xerces.xni.parser.XMLErrorHandler errorHandler, XMLErrorReporter errorReporter)`

Method Summary
`void` | `characters(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs)` Character content.
`void` | `comment(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs)` If the comment is a child of a matched element, then pass else return.
`void` | `emptyElement(org.apache.xerces.xni.QName element, org.apache.xerces.xni.XMLAttributes attributes, org.apache.xerces.xni.Augmentations augs)` An empty element.
`void` | `endCDATA(org.apache.xerces.xni.Augmentations augs)` The end of a CDATA section.
`void` | `endElement(org.apache.xerces.xni.QName element, org.apache.xerces.xni.Augmentations augs)` The end of an element.
`java.util.Vector` | `getPointerParts()` Returns a Vector of XPointerPart objects
`XPointerPart` | `getXPointerPart()` Returns the pointer part used to resolve the document fragment.
`void` | `ignorableWhitespace(org.apache.xerces.xni.XMLString text, org.apache.xerces.xni.Augmentations augs)` Ignorable whitespace.
`protected void` | `init()` Initializes the XPointer Processor;
`protected void` | `initErrorReporter()` Initializes error handling objects
`boolean` | `isChildFragmentResolved()` Returns true if the XPointer expression resolves to a non-element child of the current resource fragment.
`boolean` | `isFragmentResolved()` Returns true if the Node fragment is resolved.
`boolean` | `isXPointerResolved()` Returns true if the XPointer successfully found a sub-resource .
`void` | `parseXPointer(java.lang.String xpointer)` Parses the XPointer framework expression and delegates scheme specific parsing.
`void` | `processingInstruction(java.lang.String target, org.apache.xerces.xni.XMLString data, org.apache.xerces.xni.Augmentations augs)` A processing instruction.
`boolean` | `resolveXPointer(org.apache.xerces.xni.QName element, org.apache.xerces.xni.XMLAttributes attributes, org.apache.xerces.xni.Augmentations augs, int event)` Evaluates an XML resource with respect to an XPointer expressions by checking if it's element and attributes parameters match the criteria specified in the xpointer expression.
`void` | `setDocumentHandler(org.apache.xerces.xni.XMLDocumentHandler handler)` Sets the document handler.
`void` | `setProperty(java.lang.String propertyId, java.lang.Object value)` Sets the value of a property.
`void` | `startCDATA(org.apache.xerces.xni.Augmentations augs)` The start of a CDATA section.
`void` | `startElement(org.apache.xerces.xni.QName element, org.apache.xerces.xni.XMLAttributes attributes, org.apache.xerces.xni.Augmentations augs)` The start of an element.

Methods inherited from class org.apache.xerces.xinclude.XIncludeHandler
`addNotation, addUnparsedEntity, attributeDecl, checkAndSendNotation, checkAndSendUnparsedEntity, checkNotation, checkUnparsedEntity, copyFeatures, copyFeatures, doctypeDecl, elementDecl, endAttlist, endConditional, endDocument, endDTD, endExternalSubset, endGeneralEntity, endParameterEntity, externalEntityDecl, getBaseURI, getDocumentHandler, getDocumentSource, getDTDHandler, getDTDSource, getFeatureDefault, getLanguage, getPropertyDefault, getRecognizedFeatures, getRecognizedProperties, getRelativeBaseURI, getRelativeURI, getSawFallback, getSawInclude, getState, getState, handleFallbackElement, handleIncludeElement, hasXIncludeNamespace, ignoredCharacters, internalEntityDecl, isFallbackElement, isIncludeElement, isRootDocument, isTopLevelIncludedItem, isTopLevelIncludedItemViaFallback, isTopLevelIncludedItemViaInclude, modifyAugmentations, modifyAugmentations, notationDecl, processAttributes, processXMLBaseAttributes, processXMLLangAttributes, reportFatalError, reportFatalError, reportResourceError, reportResourceError, reset, restoreBaseURI, restoreLanguage, sameBaseURIAsIncludeParent, sameLanguageAsIncludeParent, saveBaseURI, saveLanguage, searchForRecursiveIncludes, setDocumentSource, setDTDHandler, setDTDSource, setFeature, setHref, setParent, setSawFallback, setSawInclude, setState, setupCurrentBaseURI, setXIncludeLocator, startAttlist, startConditional, startDocument, startDTD, startExternalSubset, startGeneralEntity, startParameterEntity, textDecl, unparsedEntityDecl, xmlDecl`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### fXPointerParts

    protected java.util.Vector fXPointerParts

### fXPointerPart

    protected XPointerPart fXPointerPart

### fFoundMatchingPtrPart

    protected boolean fFoundMatchingPtrPart

### fXPointerErrorReporter

    protected XMLErrorReporter fXPointerErrorReporter

### fErrorHandler

    protected org.apache.xerces.xni.parser.XMLErrorHandler fErrorHandler

### fSymbolTable

    protected SymbolTable fSymbolTable

### fIsXPointerResolved

    protected boolean fIsXPointerResolved

### fFixupBase

    protected boolean fFixupBase

### fFixupLang

    protected boolean fFixupLang

Constructor Detail

### XPointerHandler

    public XPointerHandler()

### XPointerHandler

    public XPointerHandler(SymbolTable symbolTable,
                           org.apache.xerces.xni.parser.XMLErrorHandler errorHandler,
                           XMLErrorReporter errorReporter)

Method Detail

### setDocumentHandler

    public void setDocumentHandler(org.apache.xerces.xni.XMLDocumentHandler handler)

  Description copied from interface: `org.apache.xerces.xni.parser.XMLDocumentSource`
  Sets the document handler.
  Overrides:
    `setDocumentHandler` in class `XIncludeHandler`

### parseXPointer

    public void parseXPointer(java.lang.String xpointer)
                       throws org.apache.xerces.xni.XNIException

  Parses the XPointer framework expression and delegates scheme specific parsing.
  Specified by:
    `parseXPointer` in interface `XPointerProcessor`
  See Also:
    `XPointerProcessor.parseXPointer(java.lang.String)`

### resolveXPointer

    public boolean resolveXPointer(org.apache.xerces.xni.QName element,
                                   org.apache.xerces.xni.XMLAttributes attributes,
                                   org.apache.xerces.xni.Augmentations augs,
                                   int event)
                            throws org.apache.xerces.xni.XNIException

  Description copied from interface: `XPointerProcessor`
  Evaluates an XML resource with respect to an XPointer expressions by checking if it's element and attributes parameters match the criteria specified in the xpointer expression.
  Specified by:
    `resolveXPointer` in interface `XPointerProcessor`
  See Also:
    `XPointerProcessor.resolveXPointer(org.apache.xerces.xni.QName, org.apache.xerces.xni.XMLAttributes, org.apache.xerces.xni.Augmentations, int event)`

### isFragmentResolved

    public boolean isFragmentResolved()
                               throws org.apache.xerces.xni.XNIException

  Returns true if the Node fragment is resolved.
  Specified by:
    `isFragmentResolved` in interface `XPointerProcessor`
  See Also:
    `XPointerProcessor.isFragmentResolved()`

### isChildFragmentResolved

    public boolean isChildFragmentResolved()
                                    throws org.apache.xerces.xni.XNIException

  Returns true if the XPointer expression resolves to a non-element child of the current resource fragment.
  See Also:
    `XPointerPart.isChildFragmentResolved()`

### isXPointerResolved

    public boolean isXPointerResolved()
                               throws org.apache.xerces.xni.XNIException

  Returns true if the XPointer successfully found a sub-resource .
  Specified by:
    `isXPointerResolved` in interface `XPointerProcessor`
  See Also:
    `XPointerProcessor.isFragmentResolved()`

### getXPointerPart

    public XPointerPart getXPointerPart()

  Returns the pointer part used to resolve the document fragment.
  Returns:
    String - The pointer part used to resolve the document fragment.

### initErrorReporter

    protected void initErrorReporter()

  Initializes error handling objects

### init

    protected void init()

  Initializes the XPointer Processor;

### getPointerParts

    public java.util.Vector getPointerParts()

  Returns a Vector of XPointerPart objects
  Returns:
    A Vector of XPointerPart objects.

### comment

    public void comment(org.apache.xerces.xni.XMLString text,
                        org.apache.xerces.xni.Augmentations augs)
                 throws org.apache.xerces.xni.XNIException

  If the comment is a child of a matched element, then pass else return.
  Overrides:
    `comment` in class `XIncludeHandler`
  Parameters:
    `text` - The text in the comment.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by application to signal an error.

### processingInstruction

    public void processingInstruction(java.lang.String target,
                                      org.apache.xerces.xni.XMLString data,
                                      org.apache.xerces.xni.Augmentations augs)
                               throws org.apache.xerces.xni.XNIException

  A processing instruction. Processing instructions consist of a target name and, optionally, text data. The data is only meaningful to the application.

  Typically, a processing instruction's data will contain a series of pseudo-attributes. These pseudo-attributes follow the form of element attributes but are not parsed or presented to the application as anything other than text. The application is responsible for parsing the data.

  Overrides:
    `processingInstruction` in class `XIncludeHandler`
  Parameters:
    `target` - The target.
    `data` - The data or null if none specified.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### startElement

    public void startElement(org.apache.xerces.xni.QName element,
                             org.apache.xerces.xni.XMLAttributes attributes,
                             org.apache.xerces.xni.Augmentations augs)
                      throws org.apache.xerces.xni.XNIException

  The start of an element.
  Overrides:
    `startElement` in class `XIncludeHandler`
  Parameters:
    `element` - The name of the element.
    `attributes` - The element attributes.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### emptyElement

    public void emptyElement(org.apache.xerces.xni.QName element,
                             org.apache.xerces.xni.XMLAttributes attributes,
                             org.apache.xerces.xni.Augmentations augs)
                      throws org.apache.xerces.xni.XNIException

  An empty element.
  Overrides:
    `emptyElement` in class `XIncludeHandler`
  Parameters:
    `element` - The name of the element.
    `attributes` - The element attributes.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### characters

    public void characters(org.apache.xerces.xni.XMLString text,
                           org.apache.xerces.xni.Augmentations augs)
                    throws org.apache.xerces.xni.XNIException

  Character content.
  Overrides:
    `characters` in class `XIncludeHandler`
  Parameters:
    `text` - The content.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### ignorableWhitespace

    public void ignorableWhitespace(org.apache.xerces.xni.XMLString text,
                                    org.apache.xerces.xni.Augmentations augs)
                             throws org.apache.xerces.xni.XNIException

  Ignorable whitespace. For this method to be called, the document source must have some way of determining that the text containing only whitespace characters should be considered ignorable. For example, the validator can determine if a length of whitespace characters in the document are ignorable based on the element content model.
  Overrides:
    `ignorableWhitespace` in class `XIncludeHandler`
  Parameters:
    `text` - The ignorable whitespace.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### endElement

    public void endElement(org.apache.xerces.xni.QName element,
                           org.apache.xerces.xni.Augmentations augs)
                    throws org.apache.xerces.xni.XNIException

  The end of an element.
  Overrides:
    `endElement` in class `XIncludeHandler`
  Parameters:
    `element` - The name of the element.
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### startCDATA

    public void startCDATA(org.apache.xerces.xni.Augmentations augs)
                    throws org.apache.xerces.xni.XNIException

  The start of a CDATA section.
  Overrides:
    `startCDATA` in class `XIncludeHandler`
  Parameters:
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### endCDATA

    public void endCDATA(org.apache.xerces.xni.Augmentations augs)
                  throws org.apache.xerces.xni.XNIException

  The end of a CDATA section.
  Overrides:
    `endCDATA` in class `XIncludeHandler`
  Parameters:
    `augs` - Additional information that may include infoset augmentations
  Throws:
    `org.apache.xerces.xni.XNIException` - Thrown by handler to signal an error.

### setProperty

    public void setProperty(java.lang.String propertyId,
                            java.lang.Object value)
                     throws org.apache.xerces.xni.parser.XMLConfigurationException

  Sets the value of a property. This method is called by the component manager any time after reset when a property changes value.

  Note: Components should silently ignore properties that do not affect the operation of the component.
  Overrides:
    `setProperty` in class `XIncludeHandler`
  Parameters:
    `propertyId` - The property identifier.
    `value` - The value of the property.
  Throws:
    `org.apache.xerces.xni.parser.XMLConfigurationException` - Thrown for configuration error. In general, components should only throw this exception if it is really a critical error.

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