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Cayenne Object Persistence Framework
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* 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
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* KIND, either express or implied. See the License for the
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package org.apache.cayenne.xml;
import java.util.Collection;
import java.util.Iterator;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.property.PropertyUtils;
import org.w3c.dom.Element;
/**
* A flyweight wrapper for serializing with XML mapping. This object is NOT thread-safe.
*
* @since 1.2
* @author Andrus Adamchik
*/
class SerializableEntity implements XMLSerializable {
Element descriptor;
XMLMappingDescriptor descriptorMap;
// same node can store more than one object during encoding
transient Object object;
public SerializableEntity(XMLMappingDescriptor descriptorMap, Element descriptor) {
this.descriptor = descriptor;
this.descriptorMap = descriptorMap;
}
String getName() {
return descriptor.getAttribute("name");
}
Element getDescriptor() {
return descriptor;
}
void setObject(Object object) {
this.object = object;
}
public void encodeAsXML(XMLEncoder encoder) {
if (object instanceof Collection) {
Collection c = (Collection) object;
if (!c.isEmpty()) {
// push the first node, and create the rest as peers.
Iterator it = c.iterator();
encodeObject(encoder, it.next(), true);
while (it.hasNext()) {
encodeObject(encoder, it.next(), false);
}
// Make sure we pop the node we just pushed -- needed for fix to CAY-597.
encoder.pop();
}
}
else {
encodeObject(encoder, this.object, true);
// Needed for fix to CAY-597. This makes sure we get back to the appropriate level in the DOM, rather than constantly re-rooting the tree.
encoder.pop();
}
}
public void decodeFromXML(XMLDecoder decoder) {
throw new CayenneRuntimeException("Decoding is not supported by this object");
}
void encodeObject(XMLEncoder encoder, Object object, boolean push) {
encoder.setRoot(descriptor.getAttribute("xmlTag"), null, push);
Iterator it = XMLUtil.getChildren(descriptor).iterator();
while (it.hasNext()) {
Element property = (Element) it.next();
String xmlTag = property.getAttribute("xmlTag");
String name = property.getAttribute("name");
Object value = PropertyUtils.getProperty(object, name);
if (value == null) {
continue;
}
SerializableEntity relatedEntity = descriptorMap.getEntity(xmlTag);
if (relatedEntity != null) {
relatedEntity.setObject(value);
relatedEntity.encodeAsXML(encoder);
}
else {
encoder.encodeProperty(xmlTag, value, false);
}
}
}
}
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