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## org.xml.sax.helpers
Class XMLFilterImpl

    java.lang.Object
      |
      +--org.xml.sax.helpers.XMLFilterImpl

public class XMLFilterImpl
extends java.lang.Object
implements XMLFilter, EntityResolver, DTDHandler, ContentHandler, ErrorHandler

Base class for deriving an XML filter.

> This module, both source code and documentation, is in the Public Domain, and comes with NO WARRANTY.

This class is designed to sit between an `XMLReader` and the client application's event handlers. By default, it does nothing but pass requests up to the reader and events on to the handlers unmodified, but subclasses can override specific methods to modify the event stream or the configuration requests as they pass through.

Since:
  SAX 2.0
Version:
  2.0
Author:
  David Megginson, sax@megginson.com
See Also:
  `XMLFilter`, `XMLReader`, `EntityResolver`, `DTDHandler`, `ContentHandler`, `ErrorHandler`

Constructor Summary
`XMLFilterImpl()` Construct an empty XML filter, with no parent.
`XMLFilterImpl(XMLReader parent)` Construct an XML filter with the specified parent.

Method Summary
`void` | `characters(char[] ch, int start, int length)` Filter a character data event.
`void` | `endDocument()` Filter an end document event.
`void` | `endElement(java.lang.String uri, java.lang.String localName, java.lang.String qName)` Filter an end element event.
`void` | `endPrefixMapping(java.lang.String prefix)` Filter an end Namespace prefix mapping event.
`void` | `error(SAXParseException e)` Filter an error event.
`void` | `fatalError(SAXParseException e)` Filter a fatal error event.
`ContentHandler` | `getContentHandler()` Get the content event handler.
`DTDHandler` | `getDTDHandler()` Get the current DTD event handler.
`EntityResolver` | `getEntityResolver()` Get the current entity resolver.
`ErrorHandler` | `getErrorHandler()` Get the current error event handler.
`boolean` | `getFeature(java.lang.String name)` Look up the state of a feature.
`XMLReader` | `getParent()` Get the parent reader.
`java.lang.Object` | `getProperty(java.lang.String name)` Look up the value of a property.
`void` | `ignorableWhitespace(char[] ch, int start, int length)` Filter an ignorable whitespace event.
`void` | `notationDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId)` Filter a notation declaration event.
`void` | `parse(InputSource input)` Parse a document.
`void` | `parse(java.lang.String systemId)` Parse a document.
`void` | `processingInstruction(java.lang.String target, java.lang.String data)` Filter a processing instruction event.
`InputSource` | `resolveEntity(java.lang.String publicId, java.lang.String systemId)` Filter an external entity resolution.
`void` | `setContentHandler(ContentHandler handler)` Set the content event handler.
`void` | `setDocumentLocator(Locator locator)` Filter a new document locator event.
`void` | `setDTDHandler(DTDHandler handler)` Set the DTD event handler.
`void` | `setEntityResolver(EntityResolver resolver)` Set the entity resolver.
`void` | `setErrorHandler(ErrorHandler handler)` Set the error event handler.
`void` | `setFeature(java.lang.String name, boolean state)` Set the state of a feature.
`void` | `setParent(XMLReader parent)` Set the parent reader.
`void` | `setProperty(java.lang.String name, java.lang.Object value)` Set the value of a property.
`void` | `skippedEntity(java.lang.String name)` Filter a skipped entity event.
`void` | `startDocument()` Filter a start document event.
`void` | `startElement(java.lang.String uri, java.lang.String localName, java.lang.String qName, Attributes atts)` Filter a start element event.
`void` | `startPrefixMapping(java.lang.String prefix, java.lang.String uri)` Filter a start Namespace prefix mapping event.
`void` | `unparsedEntityDecl(java.lang.String name, java.lang.String publicId, java.lang.String systemId, java.lang.String notationName)` Filter an unparsed entity declaration event.
`void` | `warning(SAXParseException e)` Filter a warning event.

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

Constructor Detail

### XMLFilterImpl

    public XMLFilterImpl()

  Construct an empty XML filter, with no parent.

  This filter will have no parent: you must assign a parent before you start a parse or do any configuration with setFeature or setProperty.

  See Also:
    `XMLReader.setFeature(java.lang.String, boolean)`, `XMLReader.setProperty(java.lang.String, java.lang.Object)`

### XMLFilterImpl

    public XMLFilterImpl(XMLReader parent)

  Construct an XML filter with the specified parent.
  See Also:
    `setParent(org.xml.sax.XMLReader)`, `getParent()`

Method Detail

### setParent

    public void setParent(XMLReader parent)

  Set the parent reader.

  This is the `XMLReader` from which this filter will obtain its events and to which it will pass its configuration requests. The parent may itself be another filter.

  If there is no parent reader set, any attempt to parse or to set or get a feature or property will fail.

  Specified by:
    setParent in interface XMLFilter
  Parameters:
    `parent` - The parent XML reader.
  Throws:
    java.lang.NullPointerException - If the parent is null.
  See Also:
    `getParent()`

### getParent

    public XMLReader getParent()

  Get the parent reader.
  Specified by:
    getParent in interface XMLFilter
  Returns:
    The parent XML reader, or null if none is set.
  See Also:
    `setParent(org.xml.sax.XMLReader)`

### setFeature

    public void setFeature(java.lang.String name,
                           boolean state)
                    throws SAXNotRecognizedException,
                           SAXNotSupportedException

  Set the state of a feature.

  This will always fail if the parent is null.

  Parameters:
    `name` - The feature name.
    `state` - The requested feature state.
  Throws:
    SAXNotRecognizedException - When the XMLReader does not recognize the feature name.
    SAXNotSupportedException - When the XMLReader recognizes the feature name but cannot set the requested value.
  See Also:
    `XMLReader.setFeature(java.lang.String, boolean)`

### getFeature

    public boolean getFeature(java.lang.String name)
                       throws SAXNotRecognizedException,
                              SAXNotSupportedException

  Look up the state of a feature.

  This will always fail if the parent is null.

  Parameters:
    `name` - The feature name.
  Returns:
    The current state of the feature.
  Throws:
    SAXNotRecognizedException - When the XMLReader does not recognize the feature name.
    SAXNotSupportedException - When the XMLReader recognizes the feature name but cannot determine its state at this time.
  See Also:
    `XMLReader.getFeature(java.lang.String)`

### setProperty

    public void setProperty(java.lang.String name,
                            java.lang.Object value)
                     throws SAXNotRecognizedException,
                            SAXNotSupportedException

  Set the value of a property.

  This will always fail if the parent is null.

  Parameters:
    `name` - The property name.
    `state` - The requested property value.
  Throws:
    SAXNotRecognizedException - When the XMLReader does not recognize the property name.
    SAXNotSupportedException - When the XMLReader recognizes the property name but cannot set the requested value.
  See Also:
    `XMLReader.setProperty(java.lang.String, java.lang.Object)`

### getProperty

    public java.lang.Object getProperty(java.lang.String name)
                                 throws SAXNotRecognizedException,
                                        SAXNotSupportedException

  Look up the value of a property.
  Parameters:
    `name` - The property name.
  Returns:
    The current value of the property.
  Throws:
    SAXNotRecognizedException - When the XMLReader does not recognize the feature name.
    SAXNotSupportedException - When the XMLReader recognizes the property name but cannot determine its value at this time.
  See Also:
    `XMLReader.setFeature(java.lang.String, boolean)`

### setEntityResolver

    public void setEntityResolver(EntityResolver resolver)

  Set the entity resolver.
  Parameters:
    `resolver` - The new entity resolver.
  Throws:
    java.lang.NullPointerException - If the resolver is null.
  See Also:
    `XMLReader.setEntityResolver(org.xml.sax.EntityResolver)`

### getEntityResolver

    public EntityResolver getEntityResolver()

  Get the current entity resolver.
  Returns:
    The current entity resolver, or null if none was set.
  See Also:
    `XMLReader.getEntityResolver()`

### setDTDHandler

    public void setDTDHandler(DTDHandler handler)

  Set the DTD event handler.
  Parameters:
    `resolver` - The new DTD handler.
  Throws:
    java.lang.NullPointerException - If the handler is null.
  See Also:
    `XMLReader.setDTDHandler(org.xml.sax.DTDHandler)`

### getDTDHandler

    public DTDHandler getDTDHandler()

  Get the current DTD event handler.
  Returns:
    The current DTD handler, or null if none was set.
  See Also:
    `XMLReader.getDTDHandler()`

### setContentHandler

    public void setContentHandler(ContentHandler handler)

  Set the content event handler.
  Parameters:
    `resolver` - The new content handler.
  Throws:
    java.lang.NullPointerException - If the handler is null.
  See Also:
    `XMLReader.setContentHandler(org.xml.sax.ContentHandler)`

### getContentHandler

    public ContentHandler getContentHandler()

  Get the content event handler.
  Returns:
    The current content handler, or null if none was set.
  See Also:
    `XMLReader.getContentHandler()`

### setErrorHandler

    public void setErrorHandler(ErrorHandler handler)

  Set the error event handler.
  Parameters:
    `handle` - The new error handler.
  Throws:
    java.lang.NullPointerException - If the handler is null.
  See Also:
    `XMLReader.setErrorHandler(org.xml.sax.ErrorHandler)`

### getErrorHandler

    public ErrorHandler getErrorHandler()

  Get the current error event handler.
  Returns:
    The current error handler, or null if none was set.
  See Also:
    `XMLReader.getErrorHandler()`

### parse

    public void parse(InputSource input)
               throws SAXException,
                      java.io.IOException

  Parse a document.
  Parameters:
    `input` - The input source for the document entity.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
    java.io.IOException - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.
  See Also:
    `XMLReader.parse(org.xml.sax.InputSource)`

### parse

    public void parse(java.lang.String systemId)
               throws SAXException,
                      java.io.IOException

  Parse a document.
  Parameters:
    `systemId` - The system identifier as a fully-qualified URI.
  Throws:
    SAXException - Any SAX exception, possibly wrapping another exception.
    java.io.IOException - An IO exception from the parser, possibly from a byte stream or character stream supplied by the application.
  See Also:
    `XMLReader.parse(java.lang.String)`

### resolveEntity

    public InputSource resolveEntity(java.lang.String publicId,
                                     java.lang.String systemId)
                              throws SAXException,
                                     java.io.IOException

  Filter an external entity resolution.
  Specified by:
    resolveEntity in interface EntityResolver
  Parameters:
    `publicId` - The entity's public identifier, or null.
    `systemId` - The entity's system identifier.
  Returns:
    A new InputSource or null for the default.
  Throws:
    SAXException - The client may throw an exception during processing.
    java.io.IOException - The client may throw an I/O-related exception while obtaining the new InputSource.
  See Also:
    `EntityResolver.resolveEntity(java.lang.String, java.lang.String)`

### notationDecl

    public void notationDecl(java.lang.String name,
                             java.lang.String publicId,
                             java.lang.String systemId)
                      throws SAXException

  Filter a notation declaration event.
  Specified by:
    notationDecl in interface DTDHandler
  Parameters:
    `name` - The notation name.
    `publicId` - The notation's public identifier, or null.
    `systemId` - The notation's system identifier, or null.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `DTDHandler.notationDecl(java.lang.String, java.lang.String, java.lang.String)`

### unparsedEntityDecl

    public void unparsedEntityDecl(java.lang.String name,
                                   java.lang.String publicId,
                                   java.lang.String systemId,
                                   java.lang.String notationName)
                            throws SAXException

  Filter an unparsed entity declaration event.
  Specified by:
    unparsedEntityDecl in interface DTDHandler
  Parameters:
    `name` - The entity name.
    `publicId` - The entity's public identifier, or null.
    `systemId` - The entity's system identifier, or null.
    `notationName` - The name of the associated notation.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `DTDHandler.unparsedEntityDecl(java.lang.String, java.lang.String, java.lang.String, java.lang.String)`

### setDocumentLocator

    public void setDocumentLocator(Locator locator)

  Filter a new document locator event.
  Specified by:
    setDocumentLocator in interface ContentHandler
  Parameters:
    `locator` - The document locator.
  See Also:
    `ContentHandler.setDocumentLocator(org.xml.sax.Locator)`

### startDocument

    public void startDocument()
                       throws SAXException

  Filter a start document event.
  Specified by:
    startDocument in interface ContentHandler
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.startDocument()`

### endDocument

    public void endDocument()
                     throws SAXException

  Filter an end document event.
  Specified by:
    endDocument in interface ContentHandler
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.endDocument()`

### startPrefixMapping

    public void startPrefixMapping(java.lang.String prefix,
                                   java.lang.String uri)
                            throws SAXException

  Filter a start Namespace prefix mapping event.
  Specified by:
    startPrefixMapping in interface ContentHandler
  Parameters:
    `prefix` - The Namespace prefix.
    `uri` - The Namespace URI.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.startPrefixMapping(java.lang.String, java.lang.String)`

### endPrefixMapping

    public void endPrefixMapping(java.lang.String prefix)
                          throws SAXException

  Filter an end Namespace prefix mapping event.
  Specified by:
    endPrefixMapping in interface ContentHandler
  Parameters:
    `prefix` - The Namespace prefix.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.endPrefixMapping(java.lang.String)`

### startElement

    public void startElement(java.lang.String uri,
                             java.lang.String localName,
                             java.lang.String qName,
                             Attributes atts)
                      throws SAXException

  Filter a start element event.
  Specified by:
    startElement in interface ContentHandler
  Parameters:
    `uri` - The element's Namespace URI, or the empty string.
    `localName` - The element's local name, or the empty string.
    `qName` - The element's qualified (prefixed) name, or the empty string.
    `atts` - The element's attributes.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)`

### endElement

    public void endElement(java.lang.String uri,
                           java.lang.String localName,
                           java.lang.String qName)
                    throws SAXException

  Filter an end element event.
  Specified by:
    endElement in interface ContentHandler
  Parameters:
    `uri` - The element's Namespace URI, or the empty string.
    `localName` - The element's local name, or the empty string.
    `qName` - The element's qualified (prefixed) name, or the empty string.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.endElement(java.lang.String, java.lang.String, java.lang.String)`

### characters

    public void characters(char[] ch,
                           int start,
                           int length)
                    throws SAXException

  Filter a character data event.
  Specified by:
    characters in interface ContentHandler
  Parameters:
    `ch` - An array of characters.
    `start` - The starting position in the array.
    `length` - The number of characters to use from the array.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.characters(char[], int, int)`

### ignorableWhitespace

    public void ignorableWhitespace(char[] ch,
                                    int start,
                                    int length)
                             throws SAXException

  Filter an ignorable whitespace event.
  Specified by:
    ignorableWhitespace in interface ContentHandler
  Parameters:
    `ch` - An array of characters.
    `start` - The starting position in the array.
    `length` - The number of characters to use from the array.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.ignorableWhitespace(char[], int, int)`

### processingInstruction

    public void processingInstruction(java.lang.String target,
                                      java.lang.String data)
                               throws SAXException

  Filter a processing instruction event.
  Specified by:
    processingInstruction in interface ContentHandler
  Parameters:
    `target` - The processing instruction target.
    `data` - The text following the target.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.processingInstruction(java.lang.String, java.lang.String)`

### skippedEntity

    public void skippedEntity(java.lang.String name)
                       throws SAXException

  Filter a skipped entity event.
  Specified by:
    skippedEntity in interface ContentHandler
  Parameters:
    `name` - The name of the skipped entity.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ContentHandler.skippedEntity(java.lang.String)`

### warning

    public void warning(SAXParseException e)
                 throws SAXException

  Filter a warning event.
  Specified by:
    warning in interface ErrorHandler
  Parameters:
    `e` - The nwarning as an exception.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ErrorHandler.warning(org.xml.sax.SAXParseException)`

### error

    public void error(SAXParseException e)
               throws SAXException

  Filter an error event.
  Specified by:
    error in interface ErrorHandler
  Parameters:
    `e` - The error as an exception.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ErrorHandler.error(org.xml.sax.SAXParseException)`

### fatalError

    public void fatalError(SAXParseException e)
                    throws SAXException

  Filter a fatal error event.
  Specified by:
    fatalError in interface ErrorHandler
  Parameters:
    `e` - The error as an exception.
  Throws:
    SAXException - The client may throw an exception during processing.
  See Also:
    `ErrorHandler.fatalError(org.xml.sax.SAXParseException)`

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