ImmutableTypesMapper


1   package com.thoughtworks.xstream.mapper;
2   
3   import com.thoughtworks.xstream.alias.ClassMapper;
4   
5   import java.util.Collections  ;
6   import java.util.HashSet  ;
7   import java.util.Set  ;
8   
9   /**
10   * Mapper that specifies which types are basic immutable types. Types that are marked as immutable will be written
11   * multiple times in the serialization stream without using references.
12   *
13   * @author Joe Walnes
14   */
15  public class ImmutableTypesMapper extends MapperWrapper {
16  
17      private final Set   immutableTypes = Collections.synchronizedSet(new HashSet  ());
18  
19      public ImmutableTypesMapper(ClassMapper wrapped) {
20          super(wrapped);
21      }
22  
23      public void addImmutableType(Class   type) {
24          immutableTypes.add(type);
25      }
26  
27      public boolean isImmutableValueType(Class   type) {
28          if (immutableTypes.contains(type)) {
29              return true;
30          } else {
31              return super.isImmutableValueType(type);
32          }
33      }
34  
35  }
36

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