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1   /**
2    * Copyright (c) 2002-2011 "Neo Technology,"
3    * Network Engine for Objects in Lund AB [http://neotechnology.com]
4    *
5    * This file is part of Neo4j.
6    *
7    * Neo4j is free software: you can redistribute it and/or modify
8    * it under the terms of the GNU General Public License as published by
9    * the Free Software Foundation, either version 3 of the License, or
10   * (at your option) any later version.
11   *
12   * This program is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   * GNU General Public License for more details.
16   *
17   * You should have received a copy of the GNU General Public License
18   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
19   */
20  package org.neo4j.server.rest.repr.formats;
21  
22  import java.net.URI;
23  import java.net.URISyntaxException;
24  import java.util.ArrayList;
25  import java.util.Collections;
26  import java.util.HashMap;
27  import java.util.List;
28  import java.util.Map;
29  
30  import javax.ws.rs.core.MediaType;
31  
32  import org.neo4j.server.rest.domain.JsonHelper;
33  import org.neo4j.server.rest.domain.JsonParseException;
34  import org.neo4j.server.rest.repr.BadInputException;
35  import org.neo4j.server.rest.repr.ListWriter;
36  import org.neo4j.server.rest.repr.MappingWriter;
37  import org.neo4j.server.rest.repr.RepresentationFormat;
38  
39  public class JsonFormat extends RepresentationFormat
40  {
41      public JsonFormat()
42      {
43          super( MediaType.APPLICATION_JSON_TYPE );
44      }
45  
46      @Override
47      protected ListWriter serializeList( String type )
48      {
49          return new ListWrappingWriter( new ArrayList<Object>() );
50      }
51  
52      @Override
53      protected String complete( ListWriter serializer )
54      {
55          return JsonHelper.createJsonFrom( ( (ListWrappingWriter) serializer ).data );
56      }
57  
58      @Override
59      protected MappingWriter serializeMapping( String type )
60      {
61          return new MapWrappingWriter( new HashMap<String, Object>() );
62      }
63  
64      @Override
65      protected String complete( MappingWriter serializer )
66      {
67          return JsonHelper.createJsonFrom( ( (MapWrappingWriter) serializer ).data );
68      }
69  
70      @Override
71      protected String serializeValue( String type, Object value )
72      {
73          return JsonHelper.createJsonFrom( value );
74      }
75  
76      private boolean empty( String input )
77      {
78          return input == null || "".equals( input.trim() );
79      }
80  
81      @Override
82      public Map<String, Object> readMap( String input ) throws BadInputException
83      {
84          if ( empty( input ) ) return Collections.emptyMap();
85          try
86          {
87              return JsonHelper.jsonToMap( stripByteOrderMark( input ) );
88          }
89          catch ( JsonParseException ex )
90          {
91              throw new BadInputException( ex );
92          }
93      }
94  
95      @Override
96      public List<Object> readList( String input )
97      {
98          // TODO tobias: Implement readList() [Dec 10, 2010]
99          throw new UnsupportedOperationException( "Not implemented: JsonInput.readList()" );
100     }
101 
102     @Override
103     public Object readValue( String input ) throws BadInputException
104     {
105         if ( empty( input ) ) return Collections.emptyMap();
106         try
107         {
108             return JsonHelper.jsonToSingleValue( stripByteOrderMark( input ) );
109         }
110         catch ( JsonParseException ex )
111         {
112             throw new BadInputException( ex );
113         }
114     }
115 
116     @Override
117     public URI readUri( String input ) throws BadInputException
118     {
119         try
120         {
121             return new URI( readValue( input ).toString() );
122         }
123         catch ( URISyntaxException e )
124         {
125             throw new BadInputException( e );
126         }
127     }
128 
129     private String stripByteOrderMark( String string )
130     {
131         if ( string != null && string.length() > 0 && string.charAt( 0 ) == 0xfeff )
132         {
133             return string.substring( 1 );
134         }
135         return string;
136     }
137 }