001    // Copyright 2008, 2010 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.EventContext;
018    import org.apache.tapestry5.internal.EmptyEventContext;
019    import org.apache.tapestry5.internal.TapestryInternalUtils;
020    import org.apache.tapestry5.internal.URLEventContext;
021    import org.apache.tapestry5.ioc.internal.util.InternalUtils;
022    import org.apache.tapestry5.ioc.services.TypeCoercer;
023    import org.apache.tapestry5.services.ContextPathEncoder;
024    import org.apache.tapestry5.services.ContextValueEncoder;
025    import org.apache.tapestry5.services.URLEncoder;
026    
027    public class ContextPathEncoderImpl implements ContextPathEncoder
028    {
029        private static final int BUFFER_SIZE = 100;
030    
031        private final ContextValueEncoder valueEncoder;
032    
033        private final URLEncoder urlEncoder;
034    
035        private final TypeCoercer typeCoercer;
036    
037        private final EventContext EMPTY = new EmptyEventContext();
038    
039        public ContextPathEncoderImpl(ContextValueEncoder valueEncoder, URLEncoder urlEncoder, TypeCoercer typeCoercer)
040        {
041            this.valueEncoder = valueEncoder;
042            this.urlEncoder = urlEncoder;
043            this.typeCoercer = typeCoercer;
044        }
045    
046        public String encodeValue(Object value)
047        {
048            String valueEncoded = value == null ? null : valueEncoder.toClient(value);
049    
050            return urlEncoder.encode(valueEncoded);
051        }
052    
053        public String encodeIntoPath(Object[] context)
054        {
055            if (context == null || context.length == 0)
056                return "";
057    
058            return encodeIntoPath(new ArrayEventContext(typeCoercer, context));
059        }
060    
061        public String encodeIntoPath(EventContext context)
062        {
063            assert context != null;
064            int count = context.getCount();
065    
066            StringBuilder output = new StringBuilder(BUFFER_SIZE);
067    
068            for (int i = 0; i < count; i++)
069            {
070                Object raw = context.get(Object.class, i);
071    
072                String urlEncoded = encodeValue(raw);
073    
074                if (i > 0)
075                    output.append("/");
076    
077                output.append(urlEncoded);
078            }
079    
080            return output.toString();
081        }
082    
083        public EventContext decodePath(String path)
084        {
085            if (InternalUtils.isBlank(path))
086                return EMPTY;
087    
088            String[] split = TapestryInternalUtils.splitPath(path);
089    
090            for (int i = 0; i < split.length; i++)
091            {
092                split[i] = urlEncoder.decode(split[i]);
093            }
094    
095            return new URLEventContext(valueEncoder, split);
096        }
097    }