/*
* 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 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.ComponentSelector;
import org.apache.avalon.framework.component.Composable;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.components.treeprocessor.InvokeContext;
import org.apache.cocoon.components.treeprocessor.ParameterizableProcessingNode;
import org.apache.cocoon.components.treeprocessor.SimpleSelectorProcessingNode;
import org.apache.cocoon.components.treeprocessor.variables.VariableResolver;
import org.apache.cocoon.environment.Environment;
import org.apache.cocoon.matching.Matcher;
import org.apache.cocoon.matching.PreparableMatcher;
import org.apache.cocoon.sitemap.PatternException;
import java.util.Map;
/**
*
* @author <a href="mailto:sylvain@apache.org">Sylvain Wallez</a>
* @version CVS $Id: PreparableMatchNode.java 30932 2004-07-29 17:35:38Z vgritsenko $
*/
public class PreparableMatchNode extends SimpleSelectorProcessingNode
implements ParameterizableProcessingNode, Composable, Disposable {
/** The 'pattern' attribute */
private String pattern;
/** The 'name' for the variable anchor */
private String name;
private Object preparedPattern;
private Map parameters;
/** The matcher, if it's ThreadSafe */
private PreparableMatcher threadSafeMatcher;
protected ComponentManager manager;
public PreparableMatchNode(String type, String pattern, String name) throws PatternException {
super(type);
this.pattern = pattern;
this.name = name;
}
public void setParameters(Map parameterMap) {
this.parameters = parameterMap;
}
public void compose(ComponentManager manager) throws ComponentException {
this.manager = manager;
setSelector((ComponentSelector)manager.lookup(Matcher.ROLE + "Selector"));
// Prepare the pattern, and keep matcher if ThreadSafe
PreparableMatcher matcher = (PreparableMatcher)selector.select(componentName);
if (matcher instanceof ThreadSafe) {
this.threadSafeMatcher = matcher;
}
try {
this.preparedPattern = matcher.preparePattern(this.pattern);
} catch(PatternException pe) {
String msg = "Invalid pattern '" + this.pattern + "' for matcher at " + this.getLocation();
throw new ComponentException(null, msg, pe);
} finally {
if (this.threadSafeMatcher == null) {
selector.release(matcher);
}
}
}
public final boolean invoke(Environment env, InvokeContext context)
throws Exception {
// Perform any common invoke functionality
super.invoke(env, context);
Map objectModel = env.getObjectModel();
Parameters resolvedParams = VariableResolver.buildParameters(
this.parameters, context, objectModel
);
Map result = null;
if (this.threadSafeMatcher != null) {
// Avoid select() and try/catch block (faster !)
result = this.threadSafeMatcher.preparedMatch(preparedPattern, objectModel, resolvedParams);
} else {
// Get matcher from selector
PreparableMatcher matcher = (PreparableMatcher)this.selector.select(this.componentName);
try {
result = matcher.preparedMatch(preparedPattern, objectModel, resolvedParams);
} finally {
this.selector.release(matcher);
}
}
if (result != null) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Matcher '" + this.componentName + "' matched prepared pattern '" +
this.pattern + "' at " + this.getLocation());
}
// Invoke children with the matcher results
return this.invokeNodes(children, env, context, name, result);
} else {
// Matcher failed
return false;
}
}
/**
* Disposable Interface
*/
public void dispose() {
if (this.threadSafeMatcher != null) {
selector.release(this.threadSafeMatcher);
this.threadSafeMatcher = null;
}
if (this.selector != null) {
this.manager.release(this.selector);
this.selector = null;
}
this.manager = null;
}
}