/* | |
* 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. | |
*/ | |
package org.apache.myfaces.buildtools.maven2.plugin.builder.trinidad.util; | |
import java.io.IOException; | |
import java.net.MalformedURLException; | |
import java.net.URL; | |
import java.util.Stack; | |
import javax.xml.parsers.ParserConfigurationException; | |
import javax.xml.parsers.SAXParser; | |
import javax.xml.parsers.SAXParserFactory; | |
import org.xml.sax.Attributes; | |
import org.xml.sax.InputSource; | |
import org.xml.sax.Locator; | |
import org.xml.sax.SAXException; | |
import org.xml.sax.XMLReader; | |
import org.xml.sax.helpers.NamespaceSupport; | |
import org.xml.sax.helpers.XMLFilterImpl; | |
public final class XIncludeFilter extends XMLFilterImpl | |
{ | |
public final static String XINCLUDE_NAMESPACE = "http://www.w3.org/2001/XInclude"; | |
public XIncludeFilter( | |
XMLReader parent, | |
URL base) | |
{ | |
super(parent); | |
bases.push(base); | |
} | |
public void setDocumentLocator( | |
Locator locator) | |
{ | |
locators.push(locator); | |
super.setDocumentLocator(locator); | |
} | |
public void startPrefixMapping( | |
String prefix, | |
String namespaceURI) throws SAXException | |
{ | |
if (!namespaceURI.equals(XINCLUDE_NAMESPACE)) | |
{ | |
namespaces.declarePrefix(prefix, namespaceURI); | |
super.startPrefixMapping(prefix, namespaceURI); | |
} | |
} | |
public void startElement( | |
String namespaceURI, | |
String localName, | |
String qualifiedName, | |
Attributes attributes) throws SAXException | |
{ | |
namespaces.pushContext(); | |
// support both DTD and Schema | |
if (namespaceURI.equals(XINCLUDE_NAMESPACE) && | |
localName.equals("include")) | |
{ | |
// href attribute is required | |
String href = attributes.getValue("href"); | |
if (href == null) | |
throw new SAXException("Missing href attribute"); | |
// xpointer attribute is optional | |
String xpointer = attributes.getValue("xpointer"); | |
doXInclude(href, xpointer); | |
} | |
else | |
{ | |
super.startElement(namespaceURI, localName, qualifiedName, attributes); | |
} | |
} | |
public void endElement( | |
String namespaceURI, | |
String localName, | |
String qualifiedName) throws SAXException | |
{ | |
if (!namespaceURI.equals(XINCLUDE_NAMESPACE)) | |
super.endElement(namespaceURI, localName, qualifiedName); | |
namespaces.popContext(); | |
} | |
public void startDocument() throws SAXException | |
{ | |
if (depth == 0) | |
super.startDocument(); | |
depth++; | |
} | |
public void endDocument() throws SAXException | |
{ | |
locators.pop(); | |
depth--; | |
if (depth == 0) | |
super.endDocument(); | |
} | |
private void doXInclude( | |
String href, | |
String xpointer) throws SAXException | |
{ | |
URL target = resolveURL(href); | |
try | |
{ | |
SAXParserFactory saxFactory = SAXParserFactory.newInstance(); | |
SAXParser saxParser = saxFactory.newSAXParser(); | |
XMLReader reader = saxParser.getXMLReader(); | |
if (xpointer != null) | |
{ | |
// pass all parsed SAX events through XPointerFilter | |
reader = new XPointerFilter(reader, namespaces, xpointer); | |
} | |
// pass all selected XPointer SAX events to XIncludeFilter | |
reader.setContentHandler(this); | |
reader.setEntityResolver(this); | |
reader.setErrorHandler(this); | |
reader.setDTDHandler(this); | |
// push on new base URL in case of nested xi:include | |
bases.push(target); | |
reader.parse(new InputSource(target.openStream())); | |
bases.pop(); | |
} | |
catch (ParserConfigurationException e) | |
{ | |
throw new SAXException("Error during xinclude of " + | |
target.toExternalForm(), e); | |
} | |
catch (IOException e) | |
{ | |
throw new SAXException("Error during xinclude of " + | |
target.toExternalForm(), e); | |
} | |
} | |
private URL resolveURL( | |
String href) throws SAXException | |
{ | |
URL base = (URL) bases.peek(); | |
try | |
{ | |
return new URL(base, href); | |
} | |
catch (MalformedURLException e) | |
{ | |
throw new SAXException("Error resolving href \"" + href + "\" " + | |
"at base \"" + base + "\"", e); | |
} | |
} | |
private int depth = 0; | |
private Stack bases = new Stack(); | |
private Stack locators = new Stack(); | |
private NamespaceSupport namespaces = new NamespaceSupport(); | |
} | |