/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: ToHTMLSAXHandler.java,v 1.8 2004/02/17 04:18:19 minchau Exp $
*/
package com.sun.org.apache.xml.internal.serializer;
import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import java.util.Properties;
import javax.xml.transform.Result;
import org.w3c.dom.Node;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.ext.LexicalHandler;
/**
* This class accepts SAX-like calls, then sends true SAX calls to a
* wrapped SAX handler. There is optimization done knowing that the ultimate
* output is HTML.
* @author Santiago Pericas-Geertsen
* @author G. Todd Miller
*/
public class ToHTMLSAXHandler extends ToSAXHandler
{
/**
* Keeps track of whether output escaping is currently enabled
*/
protected boolean m_escapeSetting = false;
/**
* Returns null.
* @return null
* @see com.sun.org.apache.xml.internal.serializer.Serializer#getOutputFormat()
*/
public Properties getOutputFormat()
{
return null;
}
/**
* Reurns null
* @return null
* @see com.sun.org.apache.xml.internal.serializer.Serializer#getOutputStream()
*/
public OutputStream getOutputStream()
{
return null;
}
/**
* Returns null
* @return null
* @see com.sun.org.apache.xml.internal.serializer.Serializer#getWriter()
*/
public Writer getWriter()
{
return null;
}
/**
* Does nothing.
*
*/
public void indent(int n) throws SAXException
{
}
/**
* Does nothing.
* @see com.sun.org.apache.xml.internal.serializer.DOMSerializer#serialize(Node)
*/
public void serialize(Node node) throws IOException
{
return;
}
/**
* Turns special character escaping on/off.
*
*
* @param excape true if escaping is to be set on.
*
* @see com.sun.org.apache.xml.internal.serializer.SerializationHandler#setEscaping(boolean)
*/
public boolean setEscaping(boolean escape) throws SAXException
{
boolean oldEscapeSetting = m_escapeSetting;
m_escapeSetting = escape;
if (escape) {
processingInstruction(Result.PI_ENABLE_OUTPUT_ESCAPING, "");
} else {
processingInstruction(Result.PI_DISABLE_OUTPUT_ESCAPING, "");
}
return oldEscapeSetting;
}
/**
* Does nothing
* @param indent the number of spaces to indent per indentation level
* (ignored)
* @see com.sun.org.apache.xml.internal.serializer.SerializationHandler#setIndent(boolean)
*/
public void setIndent(boolean indent)
{
}
/**
* Does nothing.
* @param format this parameter is not used
* @see com.sun.org.apache.xml.internal.serializer.Serializer#setOutputFormat(Properties)
*/
public void setOutputFormat(Properties format)
{
}
/**
* Does nothing.
* @param output this parameter is ignored
* @see com.sun.org.apache.xml.internal.serializer.Serializer#setOutputStream(OutputStream)
*/
public void setOutputStream(OutputStream output)
{
}
/**
* Does nothing.
* @param writer this parameter is ignored.
* @see com.sun.org.apache.xml.internal.serializer.Serializer#setWriter(Writer)
*/
public void setWriter(Writer writer)
{
}
/**
* @see org.xml.sax.ext.DeclHandler#attributeDecl(String, String, String, String, String)
*/
/**
* Does nothing.
*
* @param eName this parameter is ignored
* @param aName this parameter is ignored
* @param type this parameter is ignored
* @param valueDefault this parameter is ignored
* @param value this parameter is ignored
* @see org.xml.sax.ext.DeclHandler#attributeDecl(String, String, String,String,String)
*/
public void attributeDecl(
String eName,
String aName,
String type,
String valueDefault,
String value)
throws SAXException
{
}
/**
* Does nothing.
* @see org.xml.sax.ext.DeclHandler#elementDecl(String, String)
*/
public void elementDecl(String name, String model) throws SAXException
{
return;
}
/**
* @see org.xml.sax.ext.DeclHandler#externalEntityDecl(String, String, String)
*/
public void externalEntityDecl(String arg0, String arg1, String arg2)
throws SAXException
{
}
/**
* Does nothing.
*
* @see org.xml.sax.DTDHandler#unparsedEntityDecl
*/
public void internalEntityDecl(String name, String value)
throws SAXException
{
}
/**
* 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 namespaceURI The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param name The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @param name The element type name
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#endElement(String, String, String)
*/
public void endElement(String uri, String localName, String qName)
throws SAXException
{
flushPending();
m_saxHandler.endElement(uri, localName, qName);
// time to fire off endElement event
if (m_tracer != null)
super.fireEndElem(qName);
}
/**
* Does nothing.
*/
public void endPrefixMapping(String prefix) throws SAXException
{
}
/**
* Does nothing.
* @see org.xml.sax.ContentHandler#ignorableWhitespace(char[], int, int)
*/
public void ignorableWhitespace(char[] ch, int start, int length)
throws SAXException
{
}
/**
* 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.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @throws org.xml.sax.SAXException
* @see org.xml.sax.ContentHandler#processingInstruction(String, String)
*/
public void processingInstruction(String arg0, String arg1)
throws SAXException
{
flushPending();
m_saxHandler.processingInstruction(arg0,arg1);
// time to fire off processing instruction event
if (m_tracer != null)
super.fireEscapingEvent(arg0,arg1);
}
/**
* Does nothing.
* @see org.xml.sax.ContentHandler#setDocumentLocator(Locator)
*/
public void setDocumentLocator(Locator arg0)
{
// do nothing
}
/**
* Does nothing.
* @see org.xml.sax.ContentHandler#skippedEntity(String)
*/
public void skippedEntity(String arg0) throws SAXException
{
}
/**
* Receive notification of the beginning of an element, although this is a
* SAX method additional namespace or attribute information can occur before
* or after this call, that is associated with this element.
*
*
* @param namespaceURI The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param qName The elements name.
* @param atts The attributes attached to the element, if any.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#startElement
* @see org.xml.sax.ContentHandler#endElement
* @see org.xml.sax.AttributeList
*
* @throws org.xml.sax.SAXException
*
* @see org.xml.sax.ContentHandler#startElement(String, String, String, Attributes)
*/
public void startElement(
String namespaceURI,
String localName,
String qName,
Attributes atts)
throws SAXException
{
flushPending();
super.startElement(namespaceURI, localName, qName, atts);
m_saxHandler.startElement(namespaceURI, localName, qName, atts);
m_elemContext.m_startTagOpen = false;
}
/**
* Receive notification of a comment anywhere in the document. This callback
* will be used for comments inside or outside the document element.
* @param ch An array holding the characters in the comment.
* @param start The starting position in the array.
* @param length The number of characters to use from the array.
* @throws org.xml.sax.SAXException The application may raise an exception.
*
* @see org.xml.sax.ext.LexicalHandler#comment(char[], int, int)
*/
public void comment(char[] ch, int start, int length) throws SAXException
{
flushPending();
m_lexHandler.comment(ch, start, length);
// time to fire off comment event
if (m_tracer != null)
super.fireCommentEvent(ch, start, length);
return;
}
/**
* Does nothing.
* @see org.xml.sax.ext.LexicalHandler#endCDATA()
*/
public void endCDATA() throws SAXException
{
return;
}
/**
* Does nothing.
* @see org.xml.sax.ext.LexicalHandler#endDTD()
*/
public void endDTD() throws SAXException
{
}
/**
* Does nothing.
* @see org.xml.sax.ext.LexicalHandler#startCDATA()
*/
public void startCDATA() throws SAXException
{
}
/**
* Does nothing.
* @see org.xml.sax.ext.LexicalHandler#startEntity(String)
*/
public void startEntity(String arg0) throws SAXException
{
}
/**
* 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>
*
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @throws org.xml.sax.SAXException
*
*
*/
public void endDocument() throws SAXException
{
flushPending();
// Close output document
m_saxHandler.endDocument();
if (m_tracer != null)
super.fireEndDoc();
}
/**
* This method is called when all the data needed for a call to the
* SAX handler's startElement() method has been gathered.
*/
protected void closeStartTag() throws SAXException
{
m_elemContext.m_startTagOpen = false;
// Now is time to send the startElement event
m_saxHandler.startElement(
EMPTYSTRING,
m_elemContext.m_elementName,
m_elemContext.m_elementName,
m_attributes);
m_attributes.clear();
}
/**
* Do nothing.
* @see com.sun.org.apache.xml.internal.serializer.SerializationHandler#close()
*/
public void close()
{
return;
}
/**
* Receive notification of character data.
*
* @param chars The string of characters to process.
*
* @throws org.xml.sax.SAXException
*
* @see com.sun.org.apache.xml.internal.serializer.ExtendedContentHandler#characters(String)
*/
public void characters(final String chars) throws SAXException
{
final int length = chars.length();
if (length > m_charsBuff.length)
{
m_charsBuff = new char[length * 2 + 1];
}
chars.getChars(0, length, m_charsBuff, 0);
this.characters(m_charsBuff, 0, length);
}
/**
* A constructor
* @param handler the wrapped SAX content handler
* @param encoding the encoding of the output HTML document
*/
public ToHTMLSAXHandler(ContentHandler handler, String encoding)
{
super(handler,encoding);
}
/**
* A constructor.
* @param handler the wrapped SAX content handler
* @param lex the wrapped lexical handler
* @param encoding the encoding of the output HTML document
*/
public ToHTMLSAXHandler(
ContentHandler handler,
LexicalHandler lex,
String encoding)
{
super(handler,lex,encoding);
}
/**
* An element starts, but attributes are not fully known yet.
*
* @param elementNamespaceURI the URI of the namespace of the element
* (optional)
* @param elementLocalName the element name, but without prefix
* (optional)
* @param elementName the element name, with prefix, if any (required)
*
* @see com.sun.org.apache.xml.internal.serializer.ExtendedContentHandler#startElement(String)
*/
public void startElement(
String elementNamespaceURI,
String elementLocalName,
String elementName) throws SAXException
{
super.startElement(elementNamespaceURI, elementLocalName, elementName);
flushPending();
// Handle document type declaration (for first element only)
if (m_lexHandler != null)
{
String doctypeSystem = getDoctypeSystem();
String doctypePublic = getDoctypePublic();
if ((doctypeSystem != null) || (doctypePublic != null))
m_lexHandler.startDTD(
elementName,
doctypePublic,
doctypeSystem);
m_lexHandler = null;
}
m_elemContext = m_elemContext.push(elementNamespaceURI, elementLocalName, elementName);
}
/**
* An element starts, but attributes are not fully known yet.
*
* @param elementName the element name, with prefix, if any
*
* @see com.sun.org.apache.xml.internal.serializer.ExtendedContentHandler#startElement(String)
*/
public void startElement(String elementName) throws SAXException
{
this.startElement(null,null, elementName);
}
/**
* Receive notification of the end of an element.
* @param elementName The element type name
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
*
* @see com.sun.org.apache.xml.internal.serializer.ExtendedContentHandler#endElement(String)
*/
public void endElement(String elementName) throws SAXException
{
flushPending();
m_saxHandler.endElement(EMPTYSTRING, elementName, elementName);
// time to fire off endElement event
if (m_tracer != null)
super.fireEndElem(elementName);
}
/**
* 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 off The start position in the array.
* @param len The number of characters to read from the array.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see #ignorableWhitespace
* @see org.xml.sax.Locator
*
* @throws org.xml.sax.SAXException
*
* @see org.xml.sax.ContentHandler#characters(char[], int, int)
*/
public void characters(char[] ch, int off, int len) throws SAXException
{
flushPending();
m_saxHandler.characters(ch, off, len);
// time to fire off characters event
if (m_tracer != null)
super.fireCharEvent(ch, off, len);
}
/**
* This method flushes any pending events, which can be startDocument()
* closing the opening tag of an element, or closing an open CDATA section.
*/
public void flushPending() throws SAXException
{
if (m_needToCallStartDocument)
{
startDocumentInternal();
m_needToCallStartDocument = false;
}
// Close any open element
if (m_elemContext.m_startTagOpen)
{
closeStartTag();
m_elemContext.m_startTagOpen = false;
}
}
/**
* Handle a prefix/uri mapping, which is associated with a startElement()
* that is soon to follow. Need to close any open start tag to make
* sure than any name space attributes due to this event are associated wih
* the up comming element, not the current one.
* @see com.sun.org.apache.xml.internal.serializer.ExtendedContentHandler#startPrefixMapping
*
* @param prefix The Namespace prefix being declared.
* @param uri The Namespace URI the prefix is mapped to.
* @param shouldFlush true if any open tags need to be closed first, this
* will impact which element the mapping applies to (open parent, or its up
* comming child)
* @return returns true if the call made a change to the current
* namespace information, false if it did not change anything, e.g. if the
* prefix/namespace mapping was already in scope from before.
*
* @throws org.xml.sax.SAXException The client may throw
* an exception during processing.
*/
public boolean startPrefixMapping(
String prefix,
String uri,
boolean shouldFlush)
throws SAXException
{
// no namespace support for HTML
if (shouldFlush)
flushPending();
m_saxHandler.startPrefixMapping(prefix,uri);
return false;
}
/**
* Begin the scope of a prefix-URI Namespace mapping
* just before another element is about to start.
* This call will close any open tags so that the prefix mapping
* will not apply to the current element, but the up comming child.
*
* @see org.xml.sax.ContentHandler#startPrefixMapping
*
* @param prefix The Namespace prefix being declared.
* @param uri The Namespace URI the prefix is mapped to.
*
* @throws org.xml.sax.SAXException The client may throw
* an exception during processing.
*
*/
public void startPrefixMapping(String prefix, String uri)
throws org.xml.sax.SAXException
{
startPrefixMapping(prefix,uri,true);
}
/**
* This method is used when a prefix/uri namespace mapping
* is indicated after the element was started with a
* startElement() and before and endElement().
* startPrefixMapping(prefix,uri) would be used before the
* startElement() call.
* @param prefix the prefix associated with the given URI.
* @param uri the URI of the namespace
*
* @see com.sun.org.apache.xml.internal.serializer.ExtendedContentHandler#namespaceAfterStartElement(String, String)
*/
public void namespaceAfterStartElement(
final String prefix,
final String uri)
throws SAXException
{
// hack for XSLTC with finding URI for default namespace
if (m_elemContext.m_elementURI == null)
{
String prefix1 = getPrefixPart(m_elemContext.m_elementName);
if (prefix1 == null && EMPTYSTRING.equals(prefix))
{
// the elements URI is not known yet, and it
// doesn't have a prefix, and we are currently
// setting the uri for prefix "", so we have
// the uri for the element... lets remember it
m_elemContext.m_elementURI = uri;
}
}
startPrefixMapping(prefix,uri,false);
}
/**
* Try's to reset the super class and reset this class for
* re-use, so that you don't need to create a new serializer
* (mostly for performance reasons).
*
* @return true if the class was successfuly reset.
* @see com.sun.org.apache.xml.internal.serializer.Serializer#reset()
*/
public boolean reset()
{
boolean wasReset = false;
if (super.reset())
{
resetToHTMLSAXHandler();
wasReset = true;
}
return wasReset;
}
/**
* Reset all of the fields owned by ToHTMLSAXHandler class
*
*/
private void resetToHTMLSAXHandler()
{
this.m_escapeSetting = false;
}
}
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