/*
* Copyright 2000-2012 JetBrains s.r.o.
*
* Licensed 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 com.intellij.openapi.components.impl.stores;
import com.intellij.openapi.components.StateStorageException;
import com.intellij.openapi.components.Storage;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.InvalidDataException;
import com.intellij.openapi.util.JDOMExternalizable;
import com.intellij.openapi.util.JDOMUtil;
import com.intellij.openapi.util.WriteExternalException;
import com.intellij.util.ReflectionUtil;
import com.intellij.util.xmlb.SkipDefaultValuesSerializationFilters;
import com.intellij.util.xmlb.XmlSerializer;
import org.jdom.Element;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
@SuppressWarnings({"deprecation"})
public class DefaultStateSerializer {
private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.components.impl.stores.DefaultStateSerializer");
private DefaultStateSerializer() {
}
@Nullable
static Element serializeState(@NotNull Object state, @Nullable final Storage storage) throws WriteExternalException {
if (state instanceof Element) {
return (Element)state;
}
else if (state instanceof JDOMExternalizable) {
Element element = new Element("temp_element");
((JDOMExternalizable)state).writeExternal(element);
return element;
}
else {
return XmlSerializer.serializeIfNotDefault(state, new SkipDefaultValuesSerializationFilters());
}
}
@SuppressWarnings({"unchecked"})
@Nullable
public static <T> T deserializeState(@Nullable Element stateElement, Class <T> stateClass, @Nullable T mergeInto) throws StateStorageException {
if (stateElement == null) return mergeInto;
if (stateClass.equals(Element.class)) {
//assert mergeInto == null;
return (T)stateElement;
}
else if (JDOMExternalizable.class.isAssignableFrom(stateClass)) {
if (mergeInto != null) {
String elementText = JDOMUtil.writeElement(stateElement, "\n");
LOG.error("State is " + stateClass.getName() + ", merge into is " + mergeInto.toString() + ", state element text is " + elementText);
}
final T t = ReflectionUtil.newInstance(stateClass);
try {
((JDOMExternalizable)t).readExternal(stateElement);
return t;
}
catch (InvalidDataException e) {
throw new StateStorageException(e);
}
}
else if (mergeInto == null) {
return XmlSerializer.deserialize(stateElement, stateClass);
}
else {
XmlSerializer.deserializeInto(mergeInto, stateElement);
return mergeInto;
}
}
}