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

/*
 * Copyright 1999-2005 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.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.thread.ThreadSafe;

import org.apache.cocoon.components.treeprocessor.ContainerNodeBuilder;
import org.apache.cocoon.components.treeprocessor.ProcessingNode;
import org.apache.cocoon.components.treeprocessor.ProcessingNodeBuilder;

import java.util.ArrayList;
import java.util.List;

/**
 * Builds a <map:pipelines>
 *
 * @version $Id$
 */
public class PipelinesNodeBuilder extends ContainerNodeBuilder implements ThreadSafe {

    public ProcessingNode buildNode(Configuration config)
    throws Exception {
        // Check for component configurations
        Configuration child = config.getChild("component-configurations", false);
        if (child != null) {
            checkNamespace(child);
            this.treeBuilder.getProcessor().setComponentConfigurations(child);
        }

        PipelinesNode node = new PipelinesNode();
        this.treeBuilder.setupNode(node, config);

        Configuration[] childConfigs = config.getChildren();
        List children = new ArrayList();
        HandleErrorsNode handler = null;

        for (int i = 0; i < childConfigs.length; i++) {
            Configuration childConfig = childConfigs[i];
            if (isChild(childConfig)) {

                ProcessingNodeBuilder builder = this.treeBuilder.createNodeBuilder(childConfig);
                if (builder instanceof HandleErrorsNodeBuilder) {
                    handler = (HandleErrorsNode)builder.buildNode(childConfig);
                } else {
                    // Regular builder
                    children.add(builder.buildNode(childConfig));
                }
            }
        }

        if (children.size() == 0) {
            String msg = "There must be at least one pipeline at " + config.getLocation();
            throw new ConfigurationException(msg);
        }

        node.setChildren(toNodeArray(children));
        node.setErrorHandler(handler);

        return node;
    }
}