/*
* 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.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;
import org.apache.excalibur.source.Source;
import org.apache.excalibur.source.SourceResolver;
/**
*
* @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,v 1.12 2004/03/10 14:18:01 stephan Exp $
*/
public class MountNode extends AbstractProcessingNode implements Composable {
/** The 'uri-prefix' attribute */
private VariableResolver prefix;
/** The 'src' attribute */
private VariableResolver source;
/** Processors for sources */
private Map processors = new HashMap();
/** The processor for this node */
private TreeProcessor parentProcessor;
/** The language for the mounted processor */
private String language;
/** The component manager to be used by the mounted processor */
private ComponentManager manager;
public MountNode(VariableResolver prefix, VariableResolver source, String language, TreeProcessor parentProcessor) {
this.prefix = prefix;
this.source = source;
this.language = language;
this.parentProcessor = parentProcessor;
}
public void compose(ComponentManager manager) throws ComponentException {
this.manager = manager;
}
public final boolean invoke(Environment env, InvokeContext context)
throws Exception {
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);
String oldPrefix = env.getURIPrefix();
String oldURI = env.getURI();
String oldContext = env.getContext();
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);
// 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) 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;
}
SourceResolver resolver = (SourceResolver)this.manager.lookup(SourceResolver.ROLE);
try {
Source src = resolver.resolveURI(actualSource);
try {
processor = this.parentProcessor.createChildProcessor(this.manager, this.language, src);
} finally {
resolver.release(src);
}
} finally {
this.manager.release(resolver);
}
// 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();
}
}
}