/*
* 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.sling.scripting.xproc.cocoon.generator;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import javax.jcr.Session;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletResponse;
import org.apache.cocoon.pipeline.component.sax.AbstractGenerator;
import org.apache.cocoon.pipeline.util.XMLUtils;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.scripting.SlingScriptHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A Cocoon Generator that uses internal Sling
* request processing in order to get the initial
* XML for the pipeline.
*
* In order of preference the generator tries
* to resolve the current resource as:
*
* +-- a XML file (adapts to {@link InputStream})
* +-- dynamically generated XML (using inclusion procedure)
* +-- the underlying node´s export document view
*/
public class SlingGenerator extends AbstractGenerator {
private final Logger log = LoggerFactory.getLogger(getClass());
private SlingHttpServletRequest request;
private SlingHttpServletResponse response;
public SlingGenerator(SlingScriptHelper sling) {
this.request = sling.getRequest();
this.response = sling.getResponse();
}
public void execute() {
try {
Session session;
InputStream srcIs = genXmlSource();
if (srcIs != null)
XMLUtils.toSax(srcIs, this.getXMLConsumer());
else if ((session = request.getResource().adaptTo(Session.class)) != null) {
session.exportDocumentView(request.getResource().getPath(), this.getXMLConsumer(), true, true);
} else
throw new IllegalArgumentException("cannot generate xml source for " + request.getResource().getPath());
} catch (Throwable t) {
log.error("SlingGenerator: cannot generate xml source for "
+ request.getResource().getPath(), t);
}
}
private InputStream genXmlSource() throws Exception {
String xmlPath = request.getResource().getPath() + ".xml";
// The source is a xml file
Resource xmlResource = this.request.getResourceResolver().resolve(xmlPath);
InputStream xmlSourceFile = xmlResource.adaptTo(InputStream.class);
if (xmlSourceFile != null)
return xmlSourceFile;
// The source is dynamically generated
RequestDispatcher dispatcher = request.getRequestDispatcher(xmlPath);
SlingGeneratorServletOutputStream output = new SlingGeneratorServletOutputStream();
ServletResponse newResponse = new SlingGeneratorServletResponse(response, output);
dispatcher.include(request, newResponse);
byte[] bytes = output.toByteArray();
if (bytes.length > 0)
return new ByteArrayInputStream(bytes);
return null;
}
}