001    // Copyright 2009 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.tapestry5.internal.services;
016    
017    import org.apache.tapestry5.internal.util.Base64InputStream;
018    import org.apache.tapestry5.services.ClientDataEncoder;
019    import org.apache.tapestry5.services.ClientDataSink;
020    import org.apache.tapestry5.services.URLEncoder;
021    
022    import java.io.BufferedInputStream;
023    import java.io.IOException;
024    import java.io.ObjectInputStream;
025    import java.util.zip.GZIPInputStream;
026    
027    public class ClientDataEncoderImpl implements ClientDataEncoder
028    {
029        private final URLEncoder urlEncoder;
030    
031        public ClientDataEncoderImpl(URLEncoder urlEncoder)
032        {
033            this.urlEncoder = urlEncoder;
034        }
035    
036        public ClientDataSink createSink()
037        {
038            try
039            {
040                return new ClientDataSinkImpl(urlEncoder);
041            }
042            catch (IOException ex)
043            {
044                throw new RuntimeException(ex);
045            }
046        }
047    
048        public ObjectInputStream decodeClientData(String clientData)
049        {
050            // The clientData is Base64 that's been gzip'ed (i.e., this matches
051            // what ClientDataSinkImpl does.
052    
053            try
054            {
055                BufferedInputStream buffered = new BufferedInputStream(
056                        new GZIPInputStream(new Base64InputStream(clientData)));
057    
058                return new ObjectInputStream(buffered);
059            }
060            catch (IOException ex)
061            {
062                throw new RuntimeException(ex);
063            }
064        }
065    
066        public ObjectInputStream decodeEncodedClientData(String clientData) throws IOException
067        {
068            return decodeClientData(urlEncoder.decode(clientData));
069        }
070    }