/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.portal.event.impl;

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

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceSelector;

/**
 *
 * @author <a href="mailto:cziegeler@s-und-n.de">Carsten Ziegeler</a>
 * @author <a href="mailto:volker.schmitt@basf-it-services.com">Volker Schmitt</a>
 * 
 * @version CVS $Id$
 */
public final class EventAspectChain {
    
    private List aspects = new ArrayList();
    
    private List configs = new ArrayList();
    
    public void configure(ServiceSelector selector, Configuration conf) 
    throws ConfigurationException {
        if ( conf != null ) {
            Configuration[] aspects = conf.getChildren("aspect");
            if ( aspects != null ) {
                for(int i=0; i < aspects.length; i++) {
                    final Configuration current = aspects[i];
                    final String role = current.getAttribute("type");
                    try {
                        this.aspects.add(selector.select(role));
                        this.configs.add(Parameters.fromConfiguration(current));
                    } catch (ServiceException se) {
                        throw new ConfigurationException("Unable to lookup aspect " + role, se);
                    }
                }
            }
        } else {
            throw new ConfigurationException("No aspects configured");
        }
    }
    
    public Iterator getIterator() {
        return this.aspects.iterator();
    }
    
    public Iterator getConfigIterator() {
        return this.configs.iterator();
    }
    
    public void dispose(ServiceSelector selector) {
        Iterator i = this.aspects.iterator();
        while (i.hasNext()) {
            selector.release(i.next()); 
        }
        this.aspects.clear();
    }
}