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    
015    package org.apache.tapestry.util.io;
016    
017    import org.apache.hivemind.ApplicationRuntimeException;
018    import org.apache.tapestry.Tapestry;
019    import org.apache.tapestry.services.DataSqueezer;
020    import org.apache.tapestry.util.ComponentAddress;
021    
022    /**
023     * Squeezes a org.apache.tapestry.ComponentAddress.
024     * 
025     * @author mindbridge
026     * @since 2.2
027     */
028    
029    public class ComponentAddressAdaptor implements SqueezeAdaptor
030    {
031        private static final String PREFIX = "A";
032    
033        private static final char SEPARATOR = ',';
034    
035        public String getPrefix()
036        {
037            return PREFIX;
038        }
039    
040        public Class getDataClass()
041        {
042            return ComponentAddress.class;
043        }
044    
045        public String squeeze(DataSqueezer squeezer, Object data)
046        {
047            ComponentAddress address = (ComponentAddress) data;
048    
049            // a 'null' id path is encoded as an empty string
050            String idPath = address.getIdPath();
051            if (idPath == null)
052                idPath = "";
053    
054            return PREFIX + address.getPageName() + SEPARATOR + idPath;
055        }
056    
057        public Object unsqueeze(DataSqueezer squeezer, String string)
058        {
059            int separator = string.indexOf(SEPARATOR);
060            if (separator < 0)
061                throw new ApplicationRuntimeException(Tapestry
062                        .getMessage("ComponentAddressAdaptor.no-separator"));
063    
064            String pageName = string.substring(1, separator);
065            String idPath = string.substring(separator + 1);
066            if (idPath.equals(""))
067                idPath = null;
068    
069            return new ComponentAddress(pageName, idPath);
070        }
071    
072    }