org.xml.sax.helpers.XMLReaderAdapter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of xercesImpl Show documentation
Show all versions of xercesImpl Show documentation
Xerces2 is the next generation of high performance, fully compliant XML parsers in the Apache Xerces family.
This new version of Xerces introduces the Xerces Native Interface (XNI), a complete framework for building
parser components and configurations that is extremely modular and easy to program. The Apache Xerces2 parser is
the reference implementation of XNI but other parser components, configurations, and parsers can be written
using the Xerces Native Interface. For complete design and implementation documents, refer to the XNI Manual.
Xerces2 is a fully conforming XML Schema 1.0 processor. A partial experimental implementation of the XML Schema
1.1 Structures and Datatypes Working Drafts (December 2009) and an experimental implementation of the XML Schema
Definition Language (XSD): Component Designators (SCD) Candidate Recommendation (January 2010) are provided for
evaluation. For more information, refer to the XML Schema page. Xerces2 also provides a complete implementation
of the Document Object Model Level 3 Core and Load/Save W3C Recommendations and provides a complete
implementation of the XML Inclusions (XInclude) W3C Recommendation. It also provides support for OASIS XML
Catalogs v1.1. Xerces2 is able to parse documents written according to the XML 1.1 Recommendation, except that
it does not yet provide an option to enable normalization checking as described in section 2.13 of this
specification. It also handles namespaces according to the XML Namespaces 1.1 Recommendation, and will correctly
serialize XML 1.1 documents if the DOM level 3 load/save APIs are in use.
The newest version!
// XMLReaderAdapter.java - adapt an SAX2 XMLReader to a SAX1 Parser
// http://www.saxproject.org
// Written by David Megginson
// NO WARRANTY! This class is in the public domain.
// $Id: XMLReaderAdapter.java 226184 2005-04-08 10:53:24Z neeraj $
package org.xml.sax.helpers;
import java.io.IOException;
import java.util.Locale;
import org.xml.sax.Parser; // deprecated
import org.xml.sax.Locator;
import org.xml.sax.InputSource;
import org.xml.sax.AttributeList; // deprecated
import org.xml.sax.EntityResolver;
import org.xml.sax.DTDHandler;
import org.xml.sax.DocumentHandler; // deprecated
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXNotSupportedException;
/**
* Adapt a SAX2 XMLReader as a SAX1 Parser.
*
*
* This module, both source code and documentation, is in the
* Public Domain, and comes with NO WARRANTY.
* See http://www.saxproject.org
* for further information.
*
*
* This class wraps a SAX2 {@link org.xml.sax.XMLReader XMLReader}
* and makes it act as a SAX1 {@link org.xml.sax.Parser Parser}. The XMLReader
* must support a true value for the
* http://xml.org/sax/features/namespace-prefixes property or parsing will fail
* with a {@link org.xml.sax.SAXException SAXException}; if the XMLReader
* supports a false value for the http://xml.org/sax/features/namespaces
* property, that will also be used to improve efficiency.
*
* @since SAX 2.0
* @author David Megginson
* @version 2.0.1 (sax2r2)
* @see org.xml.sax.Parser
* @see org.xml.sax.XMLReader
*/
public class XMLReaderAdapter implements Parser, ContentHandler
{
////////////////////////////////////////////////////////////////////
// Constructor.
////////////////////////////////////////////////////////////////////
/**
* Create a new adapter.
*
* Use the "org.xml.sax.driver" property to locate the SAX2
* driver to embed.
*
* @exception org.xml.sax.SAXException If the embedded driver
* cannot be instantiated or if the
* org.xml.sax.driver property is not specified.
*/
public XMLReaderAdapter ()
throws SAXException
{
setup(XMLReaderFactory.createXMLReader());
}
/**
* Create a new adapter.
*
* Create a new adapter, wrapped around a SAX2 XMLReader.
* The adapter will make the XMLReader act like a SAX1
* Parser.
*
* @param xmlReader The SAX2 XMLReader to wrap.
* @exception java.lang.NullPointerException If the argument is null.
*/
public XMLReaderAdapter (XMLReader xmlReader)
{
setup(xmlReader);
}
/**
* Internal setup.
*
* @param xmlReader The embedded XMLReader.
*/
private void setup (XMLReader xmlReader)
{
if (xmlReader == null) {
throw new NullPointerException("XMLReader must not be null");
}
this.xmlReader = xmlReader;
qAtts = new AttributesAdapter();
}
////////////////////////////////////////////////////////////////////
// Implementation of org.xml.sax.Parser.
////////////////////////////////////////////////////////////////////
/**
* Set the locale for error reporting.
*
* This is not supported in SAX2, and will always throw
* an exception.
*
* @param locale the locale for error reporting.
* @see org.xml.sax.Parser#setLocale
* @exception org.xml.sax.SAXException Thrown unless overridden.
*/
public void setLocale (Locale locale)
throws SAXException
{
throw new SAXNotSupportedException("setLocale not supported");
}
/**
* Register the entity resolver.
*
* @param resolver The new resolver.
* @see org.xml.sax.Parser#setEntityResolver
*/
public void setEntityResolver (EntityResolver resolver)
{
xmlReader.setEntityResolver(resolver);
}
/**
* Register the DTD event handler.
*
* @param handler The new DTD event handler.
* @see org.xml.sax.Parser#setDTDHandler
*/
public void setDTDHandler (DTDHandler handler)
{
xmlReader.setDTDHandler(handler);
}
/**
* Register the SAX1 document event handler.
*
* Note that the SAX1 document handler has no Namespace
* support.
*
* @param handler The new SAX1 document event handler.
* @see org.xml.sax.Parser#setDocumentHandler
*/
public void setDocumentHandler (DocumentHandler handler)
{
documentHandler = handler;
}
/**
* Register the error event handler.
*
* @param handler The new error event handler.
* @see org.xml.sax.Parser#setErrorHandler
*/
public void setErrorHandler (ErrorHandler handler)
{
xmlReader.setErrorHandler(handler);
}
/**
* Parse the document.
*
* This method will throw an exception if the embedded
* XMLReader does not support the
* http://xml.org/sax/features/namespace-prefixes property.
*
* @param systemId The absolute URL of the document.
* @exception java.io.IOException If there is a problem reading
* the raw content of the document.
* @exception org.xml.sax.SAXException If there is a problem
* processing the document.
* @see #parse(org.xml.sax.InputSource)
* @see org.xml.sax.Parser#parse(java.lang.String)
*/
public void parse (String systemId)
throws IOException, SAXException
{
parse(new InputSource(systemId));
}
/**
* Parse the document.
*
* This method will throw an exception if the embedded
* XMLReader does not support the
* http://xml.org/sax/features/namespace-prefixes property.
*
* @param input An input source for the document.
* @exception java.io.IOException If there is a problem reading
* the raw content of the document.
* @exception org.xml.sax.SAXException If there is a problem
* processing the document.
* @see #parse(java.lang.String)
* @see org.xml.sax.Parser#parse(org.xml.sax.InputSource)
*/
public void parse (InputSource input)
throws IOException, SAXException
{
setupXMLReader();
xmlReader.parse(input);
}
/**
* Set up the XML reader.
*/
private void setupXMLReader ()
throws SAXException
{
xmlReader.setFeature("http://xml.org/sax/features/namespace-prefixes", true);
try {
xmlReader.setFeature("http://xml.org/sax/features/namespaces",
false);
} catch (SAXException e) {
// NO OP: it's just extra information, and we can ignore it
}
xmlReader.setContentHandler(this);
}
////////////////////////////////////////////////////////////////////
// Implementation of org.xml.sax.ContentHandler.
////////////////////////////////////////////////////////////////////
/**
* Set a document locator.
*
* @param locator The document locator.
* @see org.xml.sax.ContentHandler#setDocumentLocator
*/
public void setDocumentLocator (Locator locator)
{
if (documentHandler != null)
documentHandler.setDocumentLocator(locator);
}
/**
* Start document event.
*
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#startDocument
*/
public void startDocument ()
throws SAXException
{
if (documentHandler != null)
documentHandler.startDocument();
}
/**
* End document event.
*
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#endDocument
*/
public void endDocument ()
throws SAXException
{
if (documentHandler != null)
documentHandler.endDocument();
}
/**
* Adapt a SAX2 start prefix mapping event.
*
* @param prefix The prefix being mapped.
* @param uri The Namespace URI being mapped to.
* @see org.xml.sax.ContentHandler#startPrefixMapping
*/
public void startPrefixMapping (String prefix, String uri)
{
}
/**
* Adapt a SAX2 end prefix mapping event.
*
* @param prefix The prefix being mapped.
* @see org.xml.sax.ContentHandler#endPrefixMapping
*/
public void endPrefixMapping (String prefix)
{
}
/**
* Adapt a SAX2 start element event.
*
* @param uri The Namespace URI.
* @param localName The Namespace local name.
* @param qName The qualified (prefixed) name.
* @param atts The SAX2 attributes.
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#endDocument
*/
public void startElement (String uri, String localName,
String qName, Attributes atts)
throws SAXException
{
if (documentHandler != null) {
qAtts.setAttributes(atts);
documentHandler.startElement(qName, qAtts);
}
}
/**
* Adapt a SAX2 end element event.
*
* @param uri The Namespace URI.
* @param localName The Namespace local name.
* @param qName The qualified (prefixed) name.
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#endElement
*/
public void endElement (String uri, String localName,
String qName)
throws SAXException
{
if (documentHandler != null)
documentHandler.endElement(qName);
}
/**
* Adapt a SAX2 characters event.
*
* @param ch An array of characters.
* @param start The starting position in the array.
* @param length The number of characters to use.
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#characters
*/
public void characters (char ch[], int start, int length)
throws SAXException
{
if (documentHandler != null)
documentHandler.characters(ch, start, length);
}
/**
* Adapt a SAX2 ignorable whitespace event.
*
* @param ch An array of characters.
* @param start The starting position in the array.
* @param length The number of characters to use.
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#ignorableWhitespace
*/
public void ignorableWhitespace (char ch[], int start, int length)
throws SAXException
{
if (documentHandler != null)
documentHandler.ignorableWhitespace(ch, start, length);
}
/**
* Adapt a SAX2 processing instruction event.
*
* @param target The processing instruction target.
* @param data The remainder of the processing instruction
* @exception org.xml.sax.SAXException The client may raise a
* processing exception.
* @see org.xml.sax.ContentHandler#processingInstruction
*/
public void processingInstruction (String target, String data)
throws SAXException
{
if (documentHandler != null)
documentHandler.processingInstruction(target, data);
}
/**
* Adapt a SAX2 skipped entity event.
*
* @param name The name of the skipped entity.
* @see org.xml.sax.ContentHandler#skippedEntity
* @exception org.xml.sax.SAXException Throwable by subclasses.
*/
public void skippedEntity (String name)
throws SAXException
{
}
////////////////////////////////////////////////////////////////////
// Internal state.
////////////////////////////////////////////////////////////////////
XMLReader xmlReader;
DocumentHandler documentHandler;
AttributesAdapter qAtts;
////////////////////////////////////////////////////////////////////
// Internal class.
////////////////////////////////////////////////////////////////////
/**
* Internal class to wrap a SAX2 Attributes object for SAX1.
*/
final class AttributesAdapter implements AttributeList
{
AttributesAdapter ()
{
}
/**
* Set the embedded Attributes object.
*
* @param The embedded SAX2 Attributes.
*/
void setAttributes (Attributes attributes)
{
this.attributes = attributes;
}
/**
* Return the number of attributes.
*
* @return The length of the attribute list.
* @see org.xml.sax.AttributeList#getLength
*/
public int getLength ()
{
return attributes.getLength();
}
/**
* Return the qualified (prefixed) name of an attribute by position.
*
* @return The qualified name.
* @see org.xml.sax.AttributeList#getName
*/
public String getName (int i)
{
return attributes.getQName(i);
}
/**
* Return the type of an attribute by position.
*
* @return The type.
* @see org.xml.sax.AttributeList#getType(int)
*/
public String getType (int i)
{
return attributes.getType(i);
}
/**
* Return the value of an attribute by position.
*
* @return The value.
* @see org.xml.sax.AttributeList#getValue(int)
*/
public String getValue (int i)
{
return attributes.getValue(i);
}
/**
* Return the type of an attribute by qualified (prefixed) name.
*
* @return The type.
* @see org.xml.sax.AttributeList#getType(java.lang.String)
*/
public String getType (String qName)
{
return attributes.getType(qName);
}
/**
* Return the value of an attribute by qualified (prefixed) name.
*
* @return The value.
* @see org.xml.sax.AttributeList#getValue(java.lang.String)
*/
public String getValue (String qName)
{
return attributes.getValue(qName);
}
private Attributes attributes;
}
}
// end of XMLReaderAdapter.java