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1 package com.thoughtworks.xstream.core;
2
3 import com.thoughtworks.xstream.alias.ClassMapper;
4 import com.thoughtworks.xstream.converters.*;
5 import com.thoughtworks.xstream.core.util.ClassStack;
6 import com.thoughtworks.xstream.io.HierarchicalStreamReader;
7
8 public class TreeUnmarshaller implements UnmarshallingContext {
9
10 private Object  root;
11 protected HierarchicalStreamReader reader;
12 private ConverterLookup converterLookup;
13 private ClassMapper classMapper;
14 private String classAttributeIdentifier;
15 private ClassStack types = new ClassStack(16);
16
17 public TreeUnmarshaller(Object root, HierarchicalStreamReader reader,
18 ConverterLookup converterLookup, ClassMapper classMapper,
19 String classAttributeIdentifier) {
20 this.root = root;
21 this.reader = reader;
22 this.converterLookup = converterLookup;
23 this.classMapper = classMapper;
24 this.classAttributeIdentifier = classAttributeIdentifier;
25 }
26
27 public Object convertAnother(Object current, Class type) {
28 try {
29 Converter converter = converterLookup.lookupConverterForType(type);
30 types.push(type);
31 Object result = converter.unmarshal(reader, this);
32 types.popSilently();
33 return result;
34 } catch (ConversionException conversionException) {
35 addInformationTo(conversionException, type);
36 throw conversionException;
37 } catch (RuntimeException e) {
38 ConversionException conversionException = new ConversionException(e);
39 addInformationTo(conversionException, type);
40 throw conversionException;
41 }
42 }
43
44 private void addInformationTo(ErrorWriter errorWriter, Class type) {
45 errorWriter.add("class", type.getName());
46 errorWriter.add("required-type", getRequiredType().getName());
47 reader.appendErrors(errorWriter);
48 }
49
50 public Object currentObject() {
51 return root;
52 }
53
54 public Class getRequiredType() {
55 return types.peek();
56 }
57
58 public Object start() {
59 String classAttribute = reader.getAttribute(classAttributeIdentifier);
60 Class type;
61 if (classAttribute == null) {
62 type = classMapper.lookupType(reader.getNodeName());
63 } else {
64 type = classMapper.lookupType(classAttribute);
65 }
66 return convertAnother(root, type);
67 }
68
69 }
70 |
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