EnumMapConverter


1   // ***** READ THIS *****
2   // This class will only compile with JDK 1.5.0 or above as it test Java enums.
3   // If you are using an earlier version of Java, just don't try to build this class. XStream should work fine without it.
4   
5   package com.thoughtworks.xstream.converters.enums;
6   
7   import com.thoughtworks.xstream.converters.collections.MapConverter;
8   import com.thoughtworks.xstream.converters.MarshallingContext;
9   import com.thoughtworks.xstream.converters.UnmarshallingContext;
10  import com.thoughtworks.xstream.mapper.Mapper;
11  import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
12  import com.thoughtworks.xstream.io.HierarchicalStreamReader;
13  import com.thoughtworks.xstream.core.util.Fields;
14  
15  import java.util.EnumMap  ;
16  import java.lang.reflect.Field  ;
17  
18  /**
19   * Serializes an Java 5 EnumMap, including the type of Enum it's for.
20   *
21   * @author Joe Walnes
22   */
23  public class EnumMapConverter extends MapConverter {
24  
25      private final Field   typeField;
26  
27      public EnumMapConverter(Mapper mapper) {
28          super(mapper);
29          typeField = Fields.find(EnumMap  .class, "keyType");
30      }
31  
32      public boolean canConvert(Class   type) {
33          return type == EnumMap  .class;
34      }
35  
36      public void marshal(Object   source, HierarchicalStreamWriter writer, MarshallingContext context) {
37          Class   type = (Class  ) Fields.read(typeField, source);
38          writer.addAttribute(mapper().attributeForEnumType(), mapper().serializedClass(type));
39          super.marshal(source, writer, context);
40      }
41  
42      public Object   unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
43          Class   type = mapper().realClass(reader.getAttribute(mapper().attributeForEnumType()));
44          EnumMap   map = new EnumMap  (type);
45          populateMap(reader, context, map);
46          return map;
47      }
48  }
49
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