non-releases/trunk_before_flattening/src/java/org/apache/cocoon/components/treeprocessor/sitemap/CallNode.java

/*
 * 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.cocoon.components.treeprocessor.AbstractProcessingNode;
import org.apache.cocoon.components.treeprocessor.CategoryNode;
import org.apache.cocoon.components.treeprocessor.InvokeContext;
import org.apache.cocoon.components.treeprocessor.ParameterizableProcessingNode;
import org.apache.cocoon.components.treeprocessor.variables.VariableResolver;
import org.apache.cocoon.environment.Environment;

/**
 *
 * @version $Id$
 */
public class CallNode extends AbstractProcessingNode
    implements ParameterizableProcessingNode {

    /** The parameters of this node */
    private Map parameters;

    /** The 'resource' attribute */
    private VariableResolver resourceName;

    /** The category node */
    private CategoryNode resources;

    public CallNode() {
        super(null);
    }
    
    /* (non-Javadoc)
     * @see org.apache.cocoon.components.treeprocessor.ParameterizableProcessingNode#setParameters(java.util.Map)
     */
    public void setParameters(Map parameterMap) {
        this.parameters = parameterMap;
    }

    public void setResource(CategoryNode resources, VariableResolver resourceName) throws Exception {
        this.resourceName = resourceName;
        this.resources = resources;
    }

    /* (non-Javadoc)
     * @see org.apache.cocoon.components.treeprocessor.ProcessingNode#invoke(org.apache.cocoon.environment.Environment, org.apache.cocoon.components.treeprocessor.InvokeContext)
     */
    public final boolean invoke(Environment env, InvokeContext context)
      throws Exception {

        Map objectModel = env.getObjectModel();
        // Resolve parameters, but push them only once the resource name has been
        // resolved, otherwise it adds an unwanted nesting level
        Map params = VariableResolver.buildMap(this.parameters, context, objectModel);

        // Resolved resource name
        String name = this.resourceName.resolve(context, objectModel);
        if (getLogger().isDebugEnabled()) {
            getLogger().debug("Calling resource " + name);
        }
        
        // and only now push the parameters
        params = this.executor.pushVariables(this, objectModel, null, params);
        context.pushMap(null,params);
        
        try {
            return this.resources.invokeByName(name, env, context);
        } finally {
            this.executor.popVariables(this, objectModel);
            context.popMap();
        }
    }
}