http://xml.apache.org/commons/components/external/: xml-commons provides an Apache-hosted set of DOM, SAX, and JAXP interfaces for use in other xml-based projects. Our hope is that we can standardize on both a common version and packaging scheme for these critical XML standards interfaces to make the lives of both our developers and users easier. The External Components portion of xml-commons contains interfaces that are defined by external standards organizations. For DOM, that's the W3C; for SAX it's David Megginson and sax.sourceforge.net; for JAXP it's Sun. 
// SAX document handler.
// http://www.saxproject.org
// No warranty; no copyright -- use this as you will.
// $Id: DocumentHandler.java 226184 2005-04-08 10:53:24Z neeraj $

package org.xml.sax;


Receive notification of general document events.


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This was the main event-handling interface for SAX1; in SAX2, it has been replaced by 
ContentHandler, which provides Namespace support and reporting of skipped entities. This interface is included in SAX2 only to support legacy SAX1 applications.


The order of events in this interface is very important, and
mirrors the order of information in the document itself.  For
example, all of an element's content (character data, processing
instructions, and/or subelements) will appear, in order, between
the startElement event and the corresponding endElement event.


Application writers who do not want to implement the entire
interface can derive a class from HandlerBase, which implements
the default functionality; parser writers can instantiate
HandlerBase to obtain a default handler.  The application can find
the location of any document event using the Locator interface
supplied by the Parser through the setDocumentLocator method.


Author:David Megginson
See Also:
Deprecated:This interface has been replaced by the SAX2 ContentHandler interface, which includes Namespace support.
Since:SAX 1.0
Version:2.0.1 (sax2r2)
/**
 * Receive notification of general document events.
 *
 * <blockquote>
 * <em>This module, both source code and documentation, is in the
 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
 * See <a href='http://www.saxproject.org'>http://www.saxproject.org</a>
 * for further information.
 * </blockquote>
 *
 * <p>This was the main event-handling interface for SAX1; in
 * SAX2, it has been replaced by {@link org.xml.sax.ContentHandler
 * ContentHandler}, which provides Namespace support and reporting
 * of skipped entities.  This interface is included in SAX2 only
 * to support legacy SAX1 applications.</p>
 *
 * <p>The order of events in this interface is very important, and
 * mirrors the order of information in the document itself.  For
 * example, all of an element's content (character data, processing
 * instructions, and/or subelements) will appear, in order, between
 * the startElement event and the corresponding endElement event.</p>
 *
 * <p>Application writers who do not want to implement the entire
 * interface can derive a class from HandlerBase, which implements
 * the default functionality; parser writers can instantiate
 * HandlerBase to obtain a default handler.  The application can find
 * the location of any document event using the Locator interface
 * supplied by the Parser through the setDocumentLocator method.</p>
 *
 * @deprecated This interface has been replaced by the SAX2
 *             {@link org.xml.sax.ContentHandler ContentHandler}
 *             interface, which includes Namespace support.
 * @since SAX 1.0
 * @author David Megginson
 * @version 2.0.1 (sax2r2)
 * @see org.xml.sax.Parser#setDocumentHandler
 * @see org.xml.sax.Locator
 * @see org.xml.sax.HandlerBase
 */
public interface DocumentHandler {
    
    
    
Receive an object for locating the origin of SAX document events.

SAX parsers are strongly encouraged (though not absolutely
required) to supply a locator: if it does so, it must supply
the locator to the application by invoking this method before
invoking any of the other methods in the DocumentHandler
interface.


The locator allows the application to determine the end
position of any document-related event, even if the parser is
not reporting an error.  Typically, the application will
use this information for reporting its own errors (such as
character content that does not match an application's
business rules).  The information returned by the locator
is probably not sufficient for use with a search engine.


Note that the locator will return correct information only
during the invocation of the events in this interface.  The
application should not attempt to use it at any other time.


Params:
  • locator – An object that can return the location of
               any SAX document event.
See Also:
/**
     * Receive an object for locating the origin of SAX document events.
     *
     * <p>SAX parsers are strongly encouraged (though not absolutely
     * required) to supply a locator: if it does so, it must supply
     * the locator to the application by invoking this method before
     * invoking any of the other methods in the DocumentHandler
     * interface.</p>
     *
     * <p>The locator allows the application to determine the end
     * position of any document-related event, even if the parser is
     * not reporting an error.  Typically, the application will
     * use this information for reporting its own errors (such as
     * character content that does not match an application's
     * business rules).  The information returned by the locator
     * is probably not sufficient for use with a search engine.</p>
     *
     * <p>Note that the locator will return correct information only
     * during the invocation of the events in this interface.  The
     * application should not attempt to use it at any other time.</p>
     *
     * @param locator An object that can return the location of
     *                any SAX document event.
     * @see org.xml.sax.Locator
     */
    public abstract void setDocumentLocator (Locator locator);
    
    
    
Receive notification of the beginning of a document.

The SAX parser will invoke this method only once, before any
other methods in this interface or in DTDHandler (except for
setDocumentLocator).


Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
/**
     * Receive notification of the beginning of a document.
     *
     * <p>The SAX parser will invoke this method only once, before any
     * other methods in this interface or in DTDHandler (except for
     * setDocumentLocator).</p>
     *
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     */
    public abstract void startDocument ()
	throws SAXException;
    
    
    
Receive notification of the end of a document.

The SAX parser will invoke this method only once, and it will
be the last method invoked during the parse.  The parser shall
not invoke this method until it has either abandoned parsing
(because of an unrecoverable error) or reached the end of
input.


Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
/**
     * Receive notification of the end of a document.
     *
     * <p>The SAX parser will invoke this method only once, and it will
     * be the last method invoked during the parse.  The parser shall
     * not invoke this method until it has either abandoned parsing
     * (because of an unrecoverable error) or reached the end of
     * input.</p>
     *
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     */
    public abstract void endDocument ()
	throws SAXException;
    
    
    
Receive notification of the beginning of an element.

The Parser will invoke this method at the beginning of every
element in the XML document; there will be a corresponding
endElement() event for every startElement() event (even when the
element is empty). All of the element's content will be
reported, in order, before the corresponding endElement()
event.


If the element name has a namespace prefix, the prefix will
still be attached.  Note that the attribute list provided will
contain only attributes with explicit values (specified or
defaulted): #IMPLIED attributes will be omitted.


Params:
  • name – The element type name.
  • atts – The attributes attached to the element, if any.
Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
See Also:
/**
     * Receive notification of the beginning of an element.
     *
     * <p>The Parser will invoke this method at the beginning of every
     * element in the XML document; there will be a corresponding
     * endElement() event for every startElement() event (even when the
     * element is empty). All of the element's content will be
     * reported, in order, before the corresponding endElement()
     * event.</p>
     *
     * <p>If the element name has a namespace prefix, the prefix will
     * still be attached.  Note that the attribute list provided will
     * contain only attributes with explicit values (specified or
     * defaulted): #IMPLIED attributes will be omitted.</p>
     *
     * @param name The element type name.
     * @param atts The attributes attached to the element, if any.
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     * @see #endElement
     * @see org.xml.sax.AttributeList 
     */
    public abstract void startElement (String name, AttributeList atts)
	throws SAXException;
    
    
    
Receive notification of the end of an element.

The SAX parser will invoke this method at the end of every
element in the XML document; there will be a corresponding
startElement() event for every endElement() event (even when the
element is empty).


If the element name has a namespace prefix, the prefix will
still be attached to the name.


Params:
  • name – The element type name
Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
/**
     * Receive notification of the end of an element.
     *
     * <p>The SAX parser will invoke this method at the end of every
     * element in the XML document; there will be a corresponding
     * startElement() event for every endElement() event (even when the
     * element is empty).</p>
     *
     * <p>If the element name has a namespace prefix, the prefix will
     * still be attached to the name.</p>
     *
     * @param name The element type name
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     */
    public abstract void endElement (String name)
	throws SAXException;
    
    
    
Receive notification of character data.

The Parser will call this method to report each chunk of
character data.  SAX parsers may return all contiguous character
data in a single chunk, or they may split it into several
chunks; however, all of the characters in any single event
must come from the same external entity, so that the Locator
provides useful information.


The application must not attempt to read from the array
outside of the specified range.


Note that some parsers will report whitespace using the
ignorableWhitespace() method rather than this one (validating
parsers must do so).


Params:
  • ch – The characters from the XML document.
  • start – The start position in the array.
  • length – The number of characters to read from the array.
Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
See Also:
/**
     * Receive notification of character data.
     *
     * <p>The Parser will call this method to report each chunk of
     * character data.  SAX parsers may return all contiguous character
     * data in a single chunk, or they may split it into several
     * chunks; however, all of the characters in any single event
     * must come from the same external entity, so that the Locator
     * provides useful information.</p>
     *
     * <p>The application must not attempt to read from the array
     * outside of the specified range.</p>
     *
     * <p>Note that some parsers will report whitespace using the
     * ignorableWhitespace() method rather than this one (validating
     * parsers must do so).</p>
     *
     * @param ch The characters from the XML document.
     * @param start The start position in the array.
     * @param length The number of characters to read from the array.
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     * @see #ignorableWhitespace 
     * @see org.xml.sax.Locator
     */
    public abstract void characters (char ch[], int start, int length)
	throws SAXException;
    
    
    
Receive notification of ignorable whitespace in element content.

Validating Parsers must use this method to report each chunk
of ignorable whitespace (see the W3C XML 1.0 recommendation,
section 2.10): non-validating parsers may also use this method
if they are capable of parsing and using content models.


SAX parsers may return all contiguous whitespace in a single
chunk, or they may split it into several chunks; however, all of
the characters in any single event must come from the same
external entity, so that the Locator provides useful
information.


The application must not attempt to read from the array
outside of the specified range.


Params:
  • ch – The characters from the XML document.
  • start – The start position in the array.
  • length – The number of characters to read from the array.
Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
See Also:
/**
     * Receive notification of ignorable whitespace in element content.
     *
     * <p>Validating Parsers must use this method to report each chunk
     * of ignorable whitespace (see the W3C XML 1.0 recommendation,
     * section 2.10): non-validating parsers may also use this method
     * if they are capable of parsing and using content models.</p>
     *
     * <p>SAX parsers may return all contiguous whitespace in a single
     * chunk, or they may split it into several chunks; however, all of
     * the characters in any single event must come from the same
     * external entity, so that the Locator provides useful
     * information.</p>
     *
     * <p>The application must not attempt to read from the array
     * outside of the specified range.</p>
     *
     * @param ch The characters from the XML document.
     * @param start The start position in the array.
     * @param length The number of characters to read from the array.
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     * @see #characters
     */
    public abstract void ignorableWhitespace (char ch[], int start, int length)
	throws SAXException;
    
    
    
Receive notification of a processing instruction.

The Parser will invoke this method once for each processing
instruction found: note that processing instructions may occur
before or after the main document element.


A SAX parser should never report an XML declaration (XML 1.0,
section 2.8) or a text declaration (XML 1.0, section 4.3.1)
using this method.


Params:
  • target – The processing instruction target.
  • data – The processing instruction data, or null if
       none was supplied.
Throws:
  • SAXException – Any SAX exception, possibly
           wrapping another exception.
/**
     * Receive notification of a processing instruction.
     *
     * <p>The Parser will invoke this method once for each processing
     * instruction found: note that processing instructions may occur
     * before or after the main document element.</p>
     *
     * <p>A SAX parser should never report an XML declaration (XML 1.0,
     * section 2.8) or a text declaration (XML 1.0, section 4.3.1)
     * using this method.</p>
     *
     * @param target The processing instruction target.
     * @param data The processing instruction data, or null if
     *        none was supplied.
     * @exception org.xml.sax.SAXException Any SAX exception, possibly
     *            wrapping another exception.
     */
    public abstract void processingInstruction (String target, String data)
	throws SAXException;
    
}

// end of DocumentHandler.java