/*
* 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.cocoon.components.xpointer;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.cocoon.xml.XMLConsumer;
import org.apache.cocoon.xml.dom.DOMStreamer;
import org.apache.cocoon.ResourceNotFoundException;
import org.apache.excalibur.xml.xpath.XPathProcessor;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.LocatorImpl;
/**
* Partly implementation of the xpointer() scheme. Only the XPath subset of xpointer is supported.
*/
public class XPointerPart implements PointerPart {
private String expression;
public XPointerPart(String expression) {
this.expression = expression;
}
public boolean process(XPointerContext xpointerContext) throws SAXException, ResourceNotFoundException {
Document document = xpointerContext.getDocument();
ServiceManager manager = xpointerContext.getServiceManager();
XPathProcessor xpathProcessor = null;
try {
try {
xpathProcessor = (XPathProcessor)manager.lookup(XPathProcessor.ROLE);
} catch (Exception e) {
throw new SAXException("XPointerPart: error looking up XPathProcessor.", e);
}
NodeList nodeList = xpathProcessor.selectNodeList(document, expression, xpointerContext);
if (nodeList.getLength() > 0) {
XMLConsumer consumer = xpointerContext.getXmlConsumer();
LocatorImpl locator = new LocatorImpl();
locator.setSystemId(xpointerContext.getSource().getURI());
consumer.setDocumentLocator(locator);
for (int i = 0; i < nodeList.getLength(); i++) {
DOMStreamer streamer = new DOMStreamer();
streamer.setConsumer(consumer);
streamer.stream(nodeList.item(i));
}
return true;
} else {
if (xpointerContext.getLogger().isDebugEnabled())
xpointerContext.getLogger().debug("XPointer: expression \"" + expression + "\" gave no results.");
return false;
}
} finally {
if (xpathProcessor != null)
manager.release(xpathProcessor);
}
}
}