001    // Copyright 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    
015    package org.apache.tapestry.describe;
016    
017    import java.util.ArrayList;
018    import java.util.Iterator;
019    import java.util.List;
020    
021    import org.apache.hivemind.util.Defense;
022    import org.apache.tapestry.IMarkupWriter;
023    import org.apache.tapestry.event.ReportStatusEvent;
024    import org.apache.tapestry.event.ReportStatusListener;
025    
026    /**
027     * Implementation of the tapestry.describe.ReportStatusHub service.
028     * 
029     * @author Howard M. Lewis Ship
030     * @since 4.0
031     */
032    public class ReportStatusHubImpl implements ReportStatusHub
033    {
034        private List _listeners = new ArrayList();
035    
036        private RootDescriptionReceiverFactory _receiverFactory;
037    
038        public synchronized void addReportStatusListener(ReportStatusListener listener)
039        {
040            Defense.notNull(listener, "listener");
041    
042            _listeners.add(listener);
043        }
044    
045        public synchronized void removeReportStatusListener(ReportStatusListener listener)
046        {
047            Defense.notNull(listener, "listener");
048    
049            _listeners.remove(listener);
050        }
051    
052        public synchronized void fireReportStatus(IMarkupWriter writer)
053        {
054            if (_listeners.isEmpty())
055                return;
056    
057            RootDescriptionReciever receiver = _receiverFactory.newRootDescriptionReceiver(writer);
058    
059            ReportStatusEvent event = new ReportStatusEvent(this, receiver);
060    
061            Iterator i = _listeners.iterator();
062    
063            while (i.hasNext())
064            {
065                ReportStatusListener listener = (ReportStatusListener) i.next();
066    
067                listener.reportStatus(event);
068    
069                receiver.finishUp();
070            }
071        }
072    
073        public void setReceiverFactory(RootDescriptionReceiverFactory receiverFactory)
074        {
075            _receiverFactory = receiverFactory;
076        }
077    
078    }