/*
* 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.treeprocessor.sitemap;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.container.ContainerUtil;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.Processor;
import org.apache.cocoon.components.treeprocessor.AbstractProcessingNode;
import org.apache.cocoon.components.treeprocessor.InvokeContext;
import org.apache.cocoon.components.treeprocessor.TreeProcessor;
import org.apache.cocoon.components.treeprocessor.variables.VariableResolver;
import org.apache.cocoon.environment.Environment;
import org.apache.commons.lang.BooleanUtils;
/**
* @version $Id: MountNode.java 606646 2007-12-24 00:47:21Z vgritsenko $
*/
public class MountNode extends AbstractProcessingNode
implements Disposable {
/** The key to get the pass_through value from the Environment*/
public final static String COCOON_PASS_THROUGH = "COCOON_PASS_THROUGH";
/** The 'uri-prefix' attribute */
private final VariableResolver prefix;
/** The 'src' attribute */
private final VariableResolver source;
/** Processors for sources */
private Map processors = new HashMap();
/** The processor for this node */
private final TreeProcessor parentProcessor;
/** The value of the 'check-reload' attribute */
private final boolean checkReload;
/** The value of the 'pass-through' attribute */
private final Boolean passThrough;
public MountNode(VariableResolver prefix,
VariableResolver source,
TreeProcessor parentProcessor,
boolean checkReload,
boolean passThrough) {
this.prefix = prefix;
this.source = source;
this.parentProcessor = parentProcessor;
this.checkReload = checkReload;
this.passThrough = BooleanUtils.toBooleanObject(passThrough);
}
/**
* @see org.apache.cocoon.components.treeprocessor.ProcessingNode#invoke(Environment, InvokeContext)
*/
public final boolean invoke(Environment env, InvokeContext context)
throws Exception {
final Map objectModel = env.getObjectModel();
String resolvedSource = this.source.resolve(context, objectModel);
String resolvedPrefix = this.prefix.resolve(context, objectModel);
if (resolvedSource.length() == 0) {
throw new ProcessingException("Source of mount statement is empty");
}
// Handle directory mounts
if (resolvedSource.charAt(resolvedSource.length() - 1) == '/') {
resolvedSource = resolvedSource + "sitemap.xmap";
}
TreeProcessor processor = getProcessor(resolvedSource, resolvedPrefix);
// Save context
String oldPrefix = env.getURIPrefix();
String oldURI = env.getURI();
Object oldPassThrough = env.getAttribute(COCOON_PASS_THROUGH);
env.setAttribute(COCOON_PASS_THROUGH, this.passThrough);
try {
processor.getEnvironmentHelper().changeContext(env);
if (context.isBuildingPipelineOnly()) {
// Propagate pipelines
Processor.InternalPipelineDescription pp = processor.buildPipeline(env);
if (pp != null) {
context.setInternalPipelineDescription(pp);
return true;
}
return false;
}
// Processor will create its own pipelines
return processor.process(env);
} catch(Exception e) {
// Wrap with our location
throw ProcessingException.throwLocated("Sitemap: error when calling sub-sitemap", e, getLocation());
} finally {
// Restore context
env.setURI(oldPrefix, oldURI);
if (oldPassThrough != null) {
env.setAttribute(COCOON_PASS_THROUGH, oldPassThrough);
} else {
env.removeAttribute(COCOON_PASS_THROUGH);
}
}
}
private synchronized TreeProcessor getProcessor(String source, String prefix)
throws Exception {
TreeProcessor processor = (TreeProcessor) processors.get(source);
if (processor == null) {
processor = this.parentProcessor.createChildProcessor(source, this.checkReload, prefix);
// Associate to the original source
processors.put(source, processor);
}
return processor;
}
/**
* @see org.apache.avalon.framework.activity.Disposable#dispose()
*/
public void dispose() {
Iterator i = this.processors.values().iterator();
while (i.hasNext()) {
ContainerUtil.dispose(i.next());
}
this.processors.clear();
}
}