/*
* 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.Map;
import org.apache.avalon.framework.parameters.Parameters;
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.ProcessingNode;
import org.apache.cocoon.components.treeprocessor.variables.VariableResolver;
import org.apache.cocoon.environment.Environment;
import org.apache.cocoon.sitemap.ContentAggregator;
import org.apache.cocoon.sitemap.PatternException;
/**
*
* View-handling in aggregation :
* <ul>
* <li>map:aggregate can have a label, but doesn't match view from-position="first" like generators
* </li>
* <li>each map:part can have a label
* </li>
* <li>if at least one of the parts has a label matching the current view, only parts matching
* this view are added. Otherwise, all parts are added.
* </li>
* </ul>
* For more info on aggregation and views, see the mail archive
* <a href="http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=100525751417953">here</a> or
* <a href="http://marc.theaimsgroup.com/?l=xml-cocoon-dev&m=100517130418424">here</a>.
*
* @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
* @version CVS $Id: AggregateNode.java 30932 2004-07-29 17:35:38Z vgritsenko $
*/
public class AggregateNode extends AbstractProcessingNode {
private VariableResolver element;
private VariableResolver nsURI;
private VariableResolver nsPrefix;
/** All parts */
private Part[] allParts;
/** Pre-filtered Part[] for views that have a matching label in any of the parts */
private Map viewParts;
/** View nodes to jump to */
private Map viewNodes;
public AggregateNode(VariableResolver element, VariableResolver nsURI, VariableResolver nsPrefix) throws PatternException {
this.element = element;
this.nsURI = nsURI;
this.nsPrefix = nsPrefix;
}
public void setParts(Part[] allParts, Map viewParts) {
this.allParts = allParts;
this.viewParts = viewParts;
}
public void setViewNodes(Map viewNodes) {
this.viewNodes = viewNodes;
}
public boolean invoke(Environment env, InvokeContext context)
throws Exception {
boolean infoEnabled = getLogger().isInfoEnabled();
Map objectModel = env.getObjectModel();
// Setup aggregator
ProcessingPipeline processingPipeline = context.getProcessingPipeline();
processingPipeline.setGenerator("<aggregator>", null, Parameters.EMPTY_PARAMETERS, Parameters.EMPTY_PARAMETERS);
ContentAggregator aggregator = (ContentAggregator)processingPipeline.getGenerator();
aggregator.setRootElement(
this.element.resolve(context, objectModel),
this.nsURI.resolve(context, objectModel),
this.nsPrefix.resolve(context, objectModel)
);
// Get actual parts, potentially filtered by the view
Part[] actualParts;
String cocoonView = env.getView();
if (cocoonView == null) {
// Keep all parts
actualParts = this.allParts;
} else {
// Are there some parts that match this view ?
actualParts = (Part[])this.viewParts.get(cocoonView);
// If not, keep all parts
if (actualParts == null) {
actualParts = this.allParts;
}
}
// Add parts
for (int i = 0; i < actualParts.length; i++) {
Part part = actualParts[i];
if (part != null) {
aggregator.addPart(
part.source.resolve(context, objectModel),
part.element.resolve(context, objectModel),
part.nsURI.resolve(context, objectModel),
part.stripRoot.resolve(context, objectModel),
part.nsPrefix.resolve(context, objectModel)
);
}
}
// Bug #7196 : Some parts matched the view : jump to that view
if (actualParts != this.allParts) {
ProcessingNode viewNode = (ProcessingNode)this.viewNodes.get(cocoonView);
if (viewNode != null) {
if (infoEnabled) {
getLogger().info("Jumping to view '" + cocoonView + "' from aggregate part at " + this.getLocation());
}
return viewNode.invoke(env, context);
}
}
// Check aggregate-level view
if (cocoonView != null && this.viewNodes != null) {
ProcessingNode viewNode = (ProcessingNode)this.viewNodes.get(cocoonView);
if (viewNode != null) {
if (infoEnabled) {
getLogger().info("Jumping to view '" + cocoonView + "' from aggregate at " + this.getLocation());
}
return viewNode.invoke(env, context);
}
}
// Return false to continue sitemap invocation
return false;
}
public static class Part {
public Part(
VariableResolver source,
VariableResolver element,
VariableResolver nsURI,
VariableResolver nsPrefix,
VariableResolver stripRoot)
throws PatternException {
this.source = source;
this.element = element;
this.nsURI = nsURI;
this.nsPrefix = nsPrefix;
this.stripRoot = stripRoot;
}
protected VariableResolver source;
protected VariableResolver element;
protected VariableResolver nsURI;
protected VariableResolver nsPrefix;
protected VariableResolver stripRoot;
}
}