/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
package org.apache.shindig.protocol.conversion.xstream;
import java.util.AbstractMap;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.shindig.protocol.model.ExtendableBeanImpl;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
/**
* Serializes an ExtendableBeanImpl type as a Map instead of a POJO.
*
* Note: For an ExtendableBean field within a POJO to be properly serialized to
* XML, the field must still be hardcoded into the POJO, even if the POJO itself
* is an ExtendableBean. This is because POJOs are still serialized to XML
* normally to preserve custom formatting (hence why this class ONLY converts
* ExtendableBeanImpl). If xstream does not expect the ExtendableBean field, it
* will not serialize it. This does not, however, affect JSON serialization,
* which always works without predefining the field when extending
* ExtendableBean.
*/
public class ExtendableBeanConverter implements Converter {
@SuppressWarnings("rawtypes")
public boolean canConvert(Class clazz) {
return clazz.equals(ExtendableBeanImpl.class);
}
@SuppressWarnings("rawtypes")
public void marshal(Object value, HierarchicalStreamWriter writer,
MarshallingContext context) {
AbstractMap map = (AbstractMap) value;
for (Object obj : map.entrySet()) {
Entry entry = (Entry) obj;
writer.startNode(entry.getKey().toString());
if (entry.getValue() instanceof String) {
writer.setValue(entry.getValue().toString());
} else if (entry.getValue() instanceof Map) {
marshal(entry.getValue(), writer, context);
} else {
context.convertAnother(entry.getValue());
}
writer.endNode();
}
}
public Object unmarshal(HierarchicalStreamReader reader,
UnmarshallingContext context) {
return null; // XML POST not supported
}
}