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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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: StylesheetPIHandler.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xml.utils;
import java.util.StringTokenizer;
import java.util.Vector;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXSource;
import org.apache.xml.utils.SystemIDResolver;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.DefaultHandler;
/**
* Search for the xml-stylesheet processing instructions in an XML document.
* @see Associating Style Sheets with XML documents, Version 1.0
*/
public class StylesheetPIHandler extends DefaultHandler
{
/** The baseID of the document being processed. */
String m_baseID;
/** The desired media criteria. */
String m_media;
/** The desired title criteria. */
String m_title;
/** The desired character set criteria. */
String m_charset;
/** A list of SAXSource objects that match the criteria. */
Vector m_stylesheets = new Vector();
// Add code to use a URIResolver. Patch from Dmitri Ilyin.
/**
* The object that implements the URIResolver interface,
* or null.
*/
URIResolver m_uriResolver;
/**
* Get the object that will be used to resolve URIs in href
* in xml-stylesheet processing instruction.
*
* @param resolver An object that implements the URIResolver interface,
* or null.
*/
public void setURIResolver(URIResolver resolver)
{
m_uriResolver = resolver;
}
/**
* Get the object that will be used to resolve URIs in href
* in xml-stylesheet processing instruction.
*
* @return The URIResolver that was set with setURIResolver.
*/
public URIResolver getURIResolver()
{
return m_uriResolver;
}
/**
* Construct a StylesheetPIHandler instance that will search
* for xml-stylesheet PIs based on the given criteria.
*
* @param baseID The base ID of the XML document, needed to resolve
* relative IDs.
* @param media The desired media criteria.
* @param title The desired title criteria.
* @param charset The desired character set criteria.
*/
public StylesheetPIHandler(String baseID, String media, String title,
String charset)
{
m_baseID = baseID;
m_media = media;
m_title = title;
m_charset = charset;
}
/**
* Return the last stylesheet found that match the constraints.
*
* @return Source object that references the last stylesheet reference
* that matches the constraints.
*/
public Source getAssociatedStylesheet()
{
int sz = m_stylesheets.size();
if (sz > 0)
{
Source source = (Source) m_stylesheets.elementAt(sz-1);
return source;
}
else
return null;
}
/**
* Handle the xml-stylesheet processing instruction.
*
* @param target The processing instruction target.
* @param data The processing instruction data, or null if
* none is supplied.
* @throws org.xml.sax.SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#processingInstruction
* @see Associating Style Sheets with XML documents, Version 1.0
*/
public void processingInstruction(String target, String data)
throws org.xml.sax.SAXException
{
if (target.equals("xml-stylesheet"))
{
String href = null; // CDATA #REQUIRED
String type = null; // CDATA #REQUIRED
String title = null; // CDATA #IMPLIED
String media = null; // CDATA #IMPLIED
String charset = null; // CDATA #IMPLIED
boolean alternate = false; // (yes|no) "no"
StringTokenizer tokenizer = new StringTokenizer(data, " \t=\n", true);
boolean lookedAhead = false;
Source source = null;
String token = "";
while (tokenizer.hasMoreTokens())
{
if (!lookedAhead)
token = tokenizer.nextToken();
else
lookedAhead = false;
if (tokenizer.hasMoreTokens() &&
(token.equals(" ") || token.equals("\t") || token.equals("=")))
continue;
String name = token;
if (name.equals("type"))
{
token = tokenizer.nextToken();
while (tokenizer.hasMoreTokens() &&
(token.equals(" " ) || token.equals("\t") || token.equals("=")))
token = tokenizer.nextToken();
type = token.substring(1, token.length() - 1);
}
else if (name.equals("href"))
{
token = tokenizer.nextToken();
while (tokenizer.hasMoreTokens() &&
(token.equals(" " ) || token.equals("\t") || token.equals("=")))
token = tokenizer.nextToken();
href = token;
if (tokenizer.hasMoreTokens())
{
token = tokenizer.nextToken();
// If the href value has parameters to be passed to a
// servlet(something like "foobar?id=12..."),
// we want to make sure we get them added to
// the href value. Without this check, we would move on
// to try to process another attribute and that would be
// wrong.
// We need to set lookedAhead here to flag that we
// already have the next token.
while ( token.equals("=") && tokenizer.hasMoreTokens())
{
href = href + token + tokenizer.nextToken();
if (tokenizer.hasMoreTokens())
{
token = tokenizer.nextToken();
lookedAhead = true;
}
else
{
break;
}
}
}
href = href.substring(1, href.length() - 1);
try
{
// Add code to use a URIResolver. Patch from Dmitri Ilyin.
if (m_uriResolver != null)
{
source = m_uriResolver.resolve(href, m_baseID);
}
else
{
href = SystemIDResolver.getAbsoluteURI(href, m_baseID);
source = new SAXSource(new InputSource(href));
}
}
catch(TransformerException te)
{
throw new org.xml.sax.SAXException(te);
}
}
else if (name.equals("title"))
{
token = tokenizer.nextToken();
while (tokenizer.hasMoreTokens() &&
(token.equals(" " ) || token.equals("\t") || token.equals("=")))
token = tokenizer.nextToken();
title = token.substring(1, token.length() - 1);
}
else if (name.equals("media"))
{
token = tokenizer.nextToken();
while (tokenizer.hasMoreTokens() &&
(token.equals(" " ) || token.equals("\t") || token.equals("=")))
token = tokenizer.nextToken();
media = token.substring(1, token.length() - 1);
}
else if (name.equals("charset"))
{
token = tokenizer.nextToken();
while (tokenizer.hasMoreTokens() &&
(token.equals(" " ) || token.equals("\t") || token.equals("=")))
token = tokenizer.nextToken();
charset = token.substring(1, token.length() - 1);
}
else if (name.equals("alternate"))
{
token = tokenizer.nextToken();
while (tokenizer.hasMoreTokens() &&
(token.equals(" " ) || token.equals("\t") || token.equals("=")))
token = tokenizer.nextToken();
alternate = token.substring(1, token.length()
- 1).equals("yes");
}
}
if ((null != type)
&& (type.equals("text/xsl") || type.equals("text/xml") || type.equals("application/xml+xslt"))
&& (null != href))
{
if (null != m_media)
{
if (null != media)
{
if (!media.equals(m_media))
return;
}
else
return;
}
if (null != m_charset)
{
if (null != charset)
{
if (!charset.equals(m_charset))
return;
}
else
return;
}
if (null != m_title)
{
if (null != title)
{
if (!title.equals(m_title))
return;
}
else
return;
}
m_stylesheets.addElement(source);
}
}
}
/**
* The spec notes that "The xml-stylesheet processing instruction is allowed only in the prolog of an XML document.",
* so, at least for right now, I'm going to go ahead an throw a TransformerException
* in order to stop the parse.
*
* @param namespaceURI The Namespace URI, or an empty string.
* @param localName The local name (without prefix), or empty string if not namespace processing.
* @param qName The qualified name (with prefix).
* @param atts The specified or defaulted attributes.
*
* @throws StopParseException since there can be no valid xml-stylesheet processing
* instructions past the first element.
*/
public void startElement(
String namespaceURI, String localName, String qName, Attributes atts)
throws org.xml.sax.SAXException
{
throw new StopParseException();
}
/**
* Added additional getter and setter methods for the Base Id
* to fix bugzilla bug 24187
*
*/
public void setBaseId(String baseId) {
m_baseID = baseId;
}
public String getBaseId() {
return m_baseID ;
}
}
