/*
* Copyright 2009 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.impl;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.core.client.JsArrayString;
import com.google.gwt.core.shared.GWT;
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.HashMap;
import java.util.Map;
/**
* Maps class literals to type signatures and type signatures to serialization
* methods. Relies on monotonic behavior of hashcodes in Production Mode defined
* in {@link com.google.gwt.core.client.impl.Impl#getHashCode(Object)} In hosted
* mode, we map the underlying signature JsArray onto a proper IdentityHashMap.
*/
public abstract class SerializerBase implements Serializer {
/**
* Used in JavaScript to map a type to a set of serialization functions.
*/
protected static final class MethodMap extends JavaScriptObject {
protected MethodMap() {
}
native void deserialize(SerializationStreamReader stream, Object instance,
String signature) throws SerializationException /*-{
this[signature][1](stream, instance);
}-*/;
native JsArray<JavaScriptObject> get(String signature) /*-{
return this[signature];
}-*/;
native Object instantiate(SerializationStreamReader stream, String signature)
throws SerializationException /*-{
return this[signature][0](stream);
}-*/;
native void put(String signature, JsArray<JavaScriptObject> methods) /*-{
this[signature] = methods;
}-*/;
native void serialize(SerializationStreamWriter stream, Object instance,
String signature) throws SerializationException /*-{
this[signature][2](stream, instance);
}-*/;
}
private final Map<String, TypeHandler> handlerCache;
private final Map<String, String> methodMapJava;
private final MethodMap methodMapNative;
private final Map<String, String> signatureMapJava;
private final JsArrayString signatureMapNative;
public SerializerBase(Map<String, String> methodMapJava,
MethodMap methodMapNative, Map<String, String> signatureMapJava,
JsArrayString signatureMapNative) {
this.handlerCache = new HashMap<String, TypeHandler>();
this.methodMapJava = methodMapJava;
this.methodMapNative = methodMapNative;
this.signatureMapJava = signatureMapJava;
this.signatureMapNative = signatureMapNative;
}
public final void deserialize(SerializationStreamReader stream,
Object instance, String typeSignature) throws SerializationException {
if (GWT.isScript()) {
check(typeSignature, 2);
methodMapNative.deserialize(stream, instance, typeSignature);
} else {
TypeHandler typeHandler = getTypeHandler(typeSignature);
typeHandler.deserial(stream, instance);
}
}
public final String getSerializationSignature(Class<?> clazz) {
assert clazz != null : "clazz";
if (GWT.isScript()) {
return signatureMapNative.get(clazz.hashCode());
} else {
return signatureMapJava.get(clazz.getName());
}
}
public final Object instantiate(SerializationStreamReader stream,
String typeSignature) throws SerializationException {
if (GWT.isScript()) {
check(typeSignature, 1);
return methodMapNative.instantiate(stream, typeSignature);
} else {
TypeHandler typeHandler = getTypeHandler(typeSignature);
return typeHandler.create(stream);
}
}
public final void serialize(SerializationStreamWriter stream,
Object instance, String typeSignature) throws SerializationException {
if (GWT.isScript()) {
check(typeSignature, 3);
methodMapNative.serialize(stream, instance, typeSignature);
} else {
TypeHandler typeHandler = getTypeHandler(typeSignature);
typeHandler.serial(stream, instance);
}
}
private void check(String typeSignature, int length)
throws SerializationException {
/*
* Probably trying to serialize a type that isn't supposed to be
* serializable.
*/
if (methodMapNative.get(typeSignature) == null) {
throw new SerializationException(typeSignature);
}
assert methodMapNative.get(typeSignature).length() >= length : "Not enough methods, expecting "
+ length + " saw " + methodMapNative.get(typeSignature).length();
}
private TypeHandler getTypeHandler(String typeSignature)
throws SerializationException {
String typeHandlerClass = methodMapJava.get(typeSignature);
if (typeHandlerClass == null) {
/*
* Probably trying to serialize a type that isn't supposed to be
* serializable.
*/
throw new SerializationException(typeSignature);
}
TypeHandler typeHandler = handlerCache.get(typeHandlerClass);
if (typeHandler == null) {
try {
Class<?> klass = ReflectionHelper.loadClass(typeHandlerClass);
typeHandler = (TypeHandler) ReflectionHelper.newInstance(klass);
handlerCache.put(typeHandlerClass, typeHandler);
} catch (Exception e) {
throw new SerializationException(e);
}
}
return typeHandler;
}
}