/*
* Copyright 1999-2004 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.
*/
package org.apache.cocoon.forms.binding;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.cocoon.components.source.SourceUtil;
import org.apache.cocoon.forms.util.DomHelper;
import org.apache.excalibur.source.Source;
import org.apache.excalibur.source.SourceResolver;
import org.apache.excalibur.xml.xpath.XPathProcessor;
import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* InsertNodeJXPathBindingBuilder provides a helper class for the Factory
* implemented in {@link JXPathBindingManager} that helps construct the
* actual {@link InsertNodeJXPathBinding} out of the configuration in the
* provided configElement which looks like:
* <pre><code>
* <fb:insert-node>
* <!-- in here comes a template that will be inserted in the target
* document -->
* </fb:insert-node>
* </code></pre>
*
* @version CVS $Id: InsertNodeJXPathBindingBuilder.java,v 1.3 2004/04/01 12:59:57 mpo Exp $
*/
public class InsertNodeJXPathBindingBuilder
extends JXPathBindingBuilderBase {
/**
* Creates an instance of {@link InsertNodeJXPathBinding} configured
* with the nested template of the bindingElm.
*/
public JXPathBindingBase buildBinding(
Element bindingElm,
JXPathBindingManager.Assistant assistant) throws BindingException {
try {
CommonAttributes commonAtts = JXPathBindingBuilderBase.getCommonAttributes(bindingElm);
DocumentFragment domTemplate = null;
String src = bindingElm.getAttribute("src");
if (!src.equals("")) {
ServiceManager manager = assistant.getServiceManager();
SourceResolver sourceResolver = (SourceResolver)manager.lookup(SourceResolver.ROLE);
Source source = null;
try {
source = sourceResolver.resolveURI(src);
Document document = SourceUtil.toDOM(source);
Element element = document.getDocumentElement();
String xpath = bindingElm.getAttribute("xpath");
if (!xpath.equals("")) {
XPathProcessor xpathProcessor = (XPathProcessor)manager.lookup(XPathProcessor.ROLE);
try {
Node node = xpathProcessor.selectSingleNode(document, xpath);
if (node == null)
throw new BindingException("XPath expression \"" + xpath + "\" didn't return a result.");
if (!(node instanceof Element))
throw new BindingException("XPath expression \"" + xpath + "\" did not return an element node.");
element = (Element)node;
} finally {
manager.release(xpathProcessor);
}
}
domTemplate = document.createDocumentFragment();
domTemplate.appendChild(element);
} finally {
if (source != null) {
sourceResolver.release(source);
}
manager.release(sourceResolver);
}
} else {
domTemplate = bindingElm.getOwnerDocument().createDocumentFragment();
NodeList nested = bindingElm.getChildNodes();
int size = nested.getLength();
for (int i = 0; i < size; i++) {
domTemplate.appendChild(nested.item(i).cloneNode(true));
}
}
return new InsertNodeJXPathBinding(commonAtts, domTemplate);
} catch (Exception e) {
throw new BindingException("Error building the insert-node binding defined at " + DomHelper.getLocation(bindingElm), e);
}
}
}