/*
* 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.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.component.ComponentException;
import org.apache.avalon.framework.component.ComponentManager;
import org.apache.avalon.framework.component.Composable;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.components.pipeline.ProcessingPipeline;
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;
/**
*
* @author <a href="mailto:bluetkemeier@s-und-n.de">Björn Lütkemeier</a>
* @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
* @version CVS $Id: MountNode.java 55969 2004-10-29 14:01:54Z cziegeler $
*/
public class MountNode extends AbstractProcessingNode
implements Composable, Disposable {
/** The key to get the pass_through value fron the Environment */
protected 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 component manager to be used by the mounted processor */
private ComponentManager manager;
/** 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 = passThrough;
}
public void compose(ComponentManager manager) throws ComponentException {
this.manager = manager;
}
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");
}
TreeProcessor processor = getProcessor(resolvedSource, resolvedPrefix);
// Save context
String oldPrefix = env.getURIPrefix();
String oldURI = env.getURI();
String oldContext = env.getContext();
Object oldPassThrough = env.getAttribute(COCOON_PASS_THROUGH);
env.setAttribute(COCOON_PASS_THROUGH, new Boolean(passThrough));
try {
env.changeContext(resolvedPrefix, resolvedSource);
if (context.isBuildingPipelineOnly()) {
// Propagate pipelines
ProcessingPipeline pp = processor.buildPipeline(env);
if (pp != null) {
context.setProcessingPipeline( pp );
return true;
} else {
return false;
}
} else {
// Processor will create its own pipelines
return processor.process(env);
}
} finally {
// Restore context
env.setContext(oldPrefix, oldURI, oldContext);
if (oldPassThrough != null) {
env.setAttribute(COCOON_PASS_THROUGH, oldPassThrough);
} else {
env.removeAttribute(COCOON_PASS_THROUGH);
}
// Turning recomposing as a test, according to:
// http://marc.theaimsgroup.com/?t=106802211400005&r=1&w=2
// Recompose pipelines which may have been recomposed by subsitemap
// context.recompose(this.manager);
}
}
private synchronized TreeProcessor getProcessor(String source, String prefix) throws Exception {
TreeProcessor processor = (TreeProcessor)processors.get(source);
if (processor == null) {
// Handle directory mounts
String actualSource;
if (source.charAt(source.length() - 1) == '/') {
actualSource = source + "sitemap.xmap";
} else {
actualSource = source;
}
processor = this.parentProcessor.createChildProcessor(this.manager, actualSource, this.checkReload);
// Associate to the original source
processors.put(source, processor);
}
return processor;
}
/**
*
*/
public void dispose() {
Iterator iter = this.processors.values().iterator();
while(iter.hasNext()) {
((TreeProcessor)iter.next()).dispose();
}
}
}