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1 package com.thoughtworks.xstream.core;
2
3 import com.thoughtworks.xstream.alias.ClassMapper;
4 import com.thoughtworks.xstream.converters.ConverterLookup;
5 import com.thoughtworks.xstream.core.util.StringStack;
6 import com.thoughtworks.xstream.io.HierarchicalStreamReader;
7 import com.thoughtworks.xstream.io.path.PathTracker;
8 import com.thoughtworks.xstream.io.path.PathTrackingReader;
9 import com.thoughtworks.xstream.io.path.RelativePathCalculator;
10
11 import java.util.HashMap  ;
12 import java.util.Map ;
13
14 public class ReferenceByXPathUnmarshaller extends TreeUnmarshaller {
15
16 private Map values = new HashMap ();
17 private StringStack parentPathStack = new StringStack(16);
18 private PathTracker pathTracker = new PathTracker();
19 private RelativePathCalculator relativePathCalculator = new RelativePathCalculator();
20
21 public ReferenceByXPathUnmarshaller(Object root, HierarchicalStreamReader reader,
22 ConverterLookup converterLookup, ClassMapper classMapper,
23 String classAttributeIdentifier) {
24 super(root, reader, converterLookup, classMapper, classAttributeIdentifier);
25 this.reader = new PathTrackingReader(reader, pathTracker);
26 }
27
28 public Object convertAnother(Object parent, Class type) {
29 if (parentPathStack.size() > 0) { values.put(parentPathStack.peek(), parent);
31 }
32 String relativePathOfReference = reader.getAttribute("reference");
33 String currentPath = pathTracker.getCurrentPath();
34 if (relativePathOfReference != null) {
35 return values.get(relativePathCalculator.absolutePath(currentPath, relativePathOfReference));
36 } else {
37 parentPathStack.push(currentPath);
38 Object result = super.convertAnother(parent, type);
39 values.put(currentPath, result);
40 parentPathStack.popSilently();
41 return result;
42 }
43 }
44
45 }
46 |
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