/*
* Copyright 2012 Google Inc.
*
* 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.google.gwt.user.client.rpc.core.java.util;
import com.google.gwt.core.client.GwtScriptOnly;
import com.google.gwt.user.client.rpc.CustomFieldSerializer;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.client.rpc.SerializationStreamReader;
import com.google.gwt.user.client.rpc.SerializationStreamWriter;
import java.util.EnumMap;
/**
* Custom field serializer for {@link java.util.EnumMap}.
*/
@GwtScriptOnly
@SuppressWarnings({"unchecked", "rawtypes"})
public final class EnumMap_CustomFieldSerializer extends CustomFieldSerializer<EnumMap> {
public static void deserialize(SerializationStreamReader streamReader, EnumMap instance)
throws SerializationException {
Map_CustomFieldSerializerBase.deserialize(streamReader, instance);
}
/**
* EnumMap has no empty constructor; you must provide the class literal to the constructor.
* However GWT doesn't emulate java.lang.Class.forName() nor is java.util.Class GWT-RPC
* serializable. In order to get the type across the wire, one enum of the appropriate class is
* serialized at the beginning of the stream. Upon deserialization this enum's type is
* introspected and used in the constructor for the new EnumMap.
*/
public static EnumMap instantiate(SerializationStreamReader streamReader)
throws SerializationException {
Object exemplar = streamReader.readObject();
Class clazz = exemplar.getClass();
return new EnumMap(clazz);
}
public static native <E> E[] getKeyUniverse(EnumMap<?, ?> map) /*-{
return map.@java.util.EnumMap::keySet.@java.util.EnumSet$EnumSetImpl::all;
}-*/;
/**
* A jsni method is used to access the private keySet field of the EnumMap instance.
* This EnumSet field is filled with the universe of allowed enums even if the instance is empty.
* The first enum is pulled from the set and serialized to the stream in order to allow the other
* side to instantiate the correct type of EnumMap.
*/
public static void serialize(SerializationStreamWriter streamWriter, EnumMap instance)
throws SerializationException {
Object exemplar;
Object [] keyUniverse = getKeyUniverse(instance);
exemplar = keyUniverse[0];
streamWriter.writeObject(exemplar);
Map_CustomFieldSerializerBase.serialize(streamWriter, instance);
}
@Override
public void deserializeInstance(SerializationStreamReader streamReader, EnumMap instance)
throws SerializationException {
deserialize(streamReader, instance);
}
@Override
public boolean hasCustomInstantiateInstance() {
return true;
}
@Override
public EnumMap instantiateInstance(SerializationStreamReader streamReader)
throws SerializationException {
return instantiate(streamReader);
}
@Override
public void serializeInstance(SerializationStreamWriter streamWriter, EnumMap instance)
throws SerializationException {
serialize(streamWriter, instance);
}
}