Created
December 14, 2011 10:11
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Java: using custom converter that maps an XML in a Map using an attribute as key.
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package com.example.android; | |
import com.thoughtworks.xstream.*; | |
import com.thoughtworks.xstream.io.*; | |
import com.thoughtworks.xstream.mapper.*; | |
import com.thoughtworks.xstream.converters.*; | |
import com.thoughtworks.xstream.converters.collections.*; | |
import java.util.*; | |
/** | |
* This came from http://osdir.com/ml/java.xstream.user/2007-07/msg00079.html | |
* | |
* <b>Example:</b> | |
* <pre> | |
* xstream.registerConverter(new MyMapConverter<Object>(xstream.getMapper(), "class"); | |
* xstream.alias("preferences", Map.class); | |
* xstream.alias("preference", String.class); | |
* ArrayList response = (ArrayList)xstream.fromXML("<response><preferences><preference key=\"miao\">bau</preference><preference key=\"geova\">allah</preference></preferences></response>"); | |
* Map<String, String> map = (Map<String, String>)response.get(0); | |
* </pre> | |
*/ | |
class MyMapConverter<T> extends MapConverter { | |
private final String attributename; | |
public MyMapConverter(Mapper mapper, String attributename) { | |
super(mapper); | |
this.attributename = attributename; | |
} | |
public boolean canConvert(Class type) { | |
return type == HashMap.class; | |
} | |
public void marshal(Object source, HierarchicalStreamWriter writer, MarshallingContext context) { | |
Map<String, T> map = (Map<String, T>) source; | |
for (Map.Entry<String, T> entry : map.entrySet()) { | |
T value = entry.getValue(); | |
writer.startNode(mapper().serializedClass(value.getClass())); | |
writer.addAttribute(attributename, entry.getKey()); | |
context.convertAnother(value); | |
writer.endNode(); | |
} | |
} | |
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) { | |
Map<String, T> map = new HashMap<String, T>(); | |
populateStringMap(reader, context, map); | |
return map; | |
} | |
protected void populateStringMap(HierarchicalStreamReader reader, UnmarshallingContext context, Map<String, T> map) { | |
while (reader.hasMoreChildren()) { | |
reader.moveDown(); | |
String key = reader.getAttribute(attributename); | |
T value = (T) readItem(reader, context, map); | |
reader.moveUp(); | |
map.put(key, value); | |
} | |
} | |
} |
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why need to call reader.moveUp();?