ArrayConverter


1   package com.thoughtworks.xstream.converters.collections;
2   
3   import com.thoughtworks.xstream.alias.ClassMapper;
4   import com.thoughtworks.xstream.converters.MarshallingContext;
5   import com.thoughtworks.xstream.converters.UnmarshallingContext;
6   import com.thoughtworks.xstream.io.HierarchicalStreamReader;
7   import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
8   
9   import java.lang.reflect.Array  ;
10  import java.util.Iterator  ;
11  import java.util.LinkedList  ;
12  import java.util.List  ;
13  
14  /**
15   * Converts an array of objects or primitives to XML, using
16   * a nested child element for each item.
17   *
18   * @author Joe Walnes
19   */
20  public class ArrayConverter extends AbstractCollectionConverter {
21  
22      public ArrayConverter(ClassMapper classMapper, String   classAttributeIdentifier) {
23          super(classMapper, classAttributeIdentifier);
24      }
25  
26      public boolean canConvert(Class   type) {
27          return type.isArray();
28      }
29  
30      public void marshal(Object   source, HierarchicalStreamWriter writer, MarshallingContext context) {
31          int length = Array.getLength(source);
32          for (int i = 0; i < length; i++) {
33              Object   item = Array.get(source, i);
34              writeItem(item, context, writer);
35          }
36      }
37  
38      public Object   unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
39          // read the items from xml into a list
40          List   items = new LinkedList  ();
41          while (reader.hasMoreChildren()) {
42              reader.moveDown();
43              Object   item = readItem(reader, context, null); // TODO: arg, what should replace null?
44              items.add(item);
45              reader.moveUp();
46          }
47          // now convertAnother the list into an array
48          // (this has to be done as a separate list as the array size is not
49          //  known until all items have been read)
50          Object   array = Array.newInstance(context.getRequiredType().getComponentType(), items.size());
51          int i = 0;
52          for (Iterator   iterator = items.iterator(); iterator.hasNext();) {
53              Object   item = (Object  ) iterator.next();
54              Array.set(array, i, item);
55              i++;
56          }
57          return array;
58      }
59  }
60
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags