/*
* 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.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.context.ContextException;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.cocoon.Constants;
import org.apache.cocoon.components.flow.Interpreter;
import org.apache.cocoon.components.treeprocessor.AbstractProcessingNode;
import org.apache.cocoon.components.treeprocessor.InvokeContext;
import org.apache.cocoon.environment.Context;
import org.apache.cocoon.environment.Environment;
/**
* Handler for <map:flow> element in the sitemap.
*
* @author <a href="mailto:ovidiu@apache.org">Ovidiu Predescu</a>
* @since September 13, 2002
* @version CVS $Id: FlowNode.java,v 1.4 2004/03/05 13:02:52 bdelacretaz Exp $
*/
public class FlowNode extends AbstractProcessingNode
implements Composable, Contextualizable {
ComponentManager manager;
String language;
Context context;
Interpreter interpreter;
public FlowNode(String language) {
this.language = language;
}
/**
* This method should never be called by the TreeProcessor, since a
* <code><map:flow></code> element should not be in an
* "executable" sitemap node.
*
* @param env an <code>Environment</code> value
* @param context an <code>InvokeContext</code> value
* @return a <code>boolean</code> value
* @exception Exception if an error occurs
*/
public boolean invoke(Environment env, InvokeContext context) throws Exception {
return true;
}
public void contextualize(org.apache.avalon.framework.context.Context context)
throws ContextException {
this.context = (Context)context.get(Constants.CONTEXT_ENVIRONMENT_CONTEXT);
}
/**
*
* Lookup an flow {@link org.apache.cocoon.components.flow.Interpreter}
* instance to hold the scripts defined within the <code><map:flow></code>
* in the sitemap.
*
* @param manager a <code>ComponentManager</code> value
* @exception ComponentException if no flow interpreter could be obtained
*/
public void compose(ComponentManager manager) throws ComponentException {
this.manager = manager;
try {
ComponentSelector selector = (ComponentSelector)manager.lookup(Interpreter.ROLE);
// Obtain the Interpreter instance for this language
interpreter = (Interpreter)selector.select(language);
} catch (Exception ex) {
throw new ComponentException(language,
"ScriptNode: Couldn't obtain a flow interpreter for " + language + ": " + ex);
}
}
public Interpreter getInterpreter() {
return interpreter;
}
}