001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    package org.apache.tapestry.services.impl;
015    
016    import java.io.IOException;
017    import java.util.List;
018    
019    import org.apache.hivemind.ApplicationRuntimeException;
020    import org.apache.tapestry.IRequestCycle;
021    import org.apache.tapestry.services.ResponseBuilder;
022    import org.apache.tapestry.services.ResponseContributor;
023    import org.apache.tapestry.services.ResponseDelegateFactory;
024    
025    /**
026     * Implementation of {@link ResponseDelegateFactory}.
027     *
028     * @author jkuhnert
029     */
030    public class ResponseDelegateFactoryImpl implements ResponseDelegateFactory {
031        
032        /** Configured response contribution choosers. */
033        protected List _responseContributors;
034        
035        /**
036         * {@inheritDoc}
037         */
038        public ResponseBuilder getResponseBuilder(IRequestCycle cycle)
039        throws IOException
040        {
041            if (_responseContributors == null)
042                return null;
043            
044            for (int i = 0; i < _responseContributors.size(); i++) {
045                ResponseContributor rc = (ResponseContributor)_responseContributors.get(i);
046                if (rc.handlesResponse(cycle))
047                    return rc.createBuilder(cycle);
048            }
049            
050            throw new ApplicationRuntimeException(ImplMessages.unknownRequest());
051        }
052        
053        /**
054         * Sets a configured list of {@link ResponseContributor} objects to be used
055         * in processing ajax requests.
056         * 
057         * @param responseContributors
058         */
059        public void setResponseContributors(List responseContributors)
060        {
061            this._responseContributors = responseContributors;
062        }
063    }