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ClientSerializationStreamReader.java
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ClientSerializationStreamReader.java
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/*
* Copyright 2008 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.GwtScriptOnly;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsonUtils;
import com.google.gwt.core.client.UnsafeNativeLong;
import com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException;
import com.google.gwt.user.client.rpc.SerializationException;
/**
* The web-mode only version of ClientSerializationStreamReader. Any changes to this class to deal
* with protocol changes must also be applied to the devmode version of
* ClientSerializationStreamReader.
*/
@GwtScriptOnly
public final class ClientSerializationStreamReader extends
AbstractSerializationStreamReader {
private static native JavaScriptObject eval(String encoded) /*-{
return eval(encoded);
}-*/;
private static native int getLength(JavaScriptObject array) /*-{
return array.length;
}-*/;
int index;
JavaScriptObject results;
JavaScriptObject stringTable;
private Serializer serializer;
public ClientSerializationStreamReader(Serializer serializer) {
this.serializer = serializer;
}
@Override
public void prepareToRead(String encoded) throws SerializationException {
/*
* Need to read the version from the string since version is later set in
* super.prepareToRead() from the evaluated payload but that is too late.
*/
if (readVersion(encoded) < SERIALIZATION_STREAM_JSON_VERSION) {
// Versions prior to 8 uses almost JSON with Javascript is special cases; e.g., using ].concat([,
// non-stringified NaN/Infinity or ''+'' concatenated strings.
results = eval(encoded);
} else {
results = JsonUtils.safeEval(encoded);
}
index = getLength(results);
super.prepareToRead(encoded);
if (getVersion() < SERIALIZATION_STREAM_MIN_VERSION
|| getVersion() > SERIALIZATION_STREAM_MAX_VERSION) {
throw new IncompatibleRemoteServiceException("Got version " + getVersion()
+ ", expected version between " + SERIALIZATION_STREAM_MIN_VERSION + " and "
+ SERIALIZATION_STREAM_MAX_VERSION);
}
if (!areFlagsValid()) {
throw new IncompatibleRemoteServiceException("Got an unknown flag from "
+ "server: " + getFlags());
}
stringTable = readJavaScriptObject();
}
public native boolean readBoolean() /*-{
return !!this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
}-*/;
public native byte readByte() /*-{
return this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
}-*/;
public native char readChar() /*-{
return this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
}-*/;
public native double readDouble() /*-{
return Number(this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index]);
}-*/;
public native float readFloat() /*-{
return Number(this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index]);
}-*/;
public native int readInt() /*-{
return this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
}-*/;
@UnsafeNativeLong
public native long readLong() /*-{
var s = this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
return @ClientSerializationStreamReader::longFromBase64(Ljava/lang/String;)(s);
}-*/;
public native short readShort() /*-{
return this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
}-*/;
public String readString() {
return getString(readInt());
}
@Override
protected Object deserialize(String typeSignature)
throws SerializationException {
int id = reserveDecodedObjectIndex();
Object instance = serializer.instantiate(this, typeSignature);
rememberDecodedObject(id, instance);
serializer.deserialize(this, instance, typeSignature);
return instance;
}
@Override
protected native String getString(int index) /*-{
// index is 1-based
return index > 0 ? this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::stringTable[index - 1] : null;
}-*/;
private native JavaScriptObject readJavaScriptObject() /*-{
return this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::results[--this.@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::index];
}-*/;
private static int readVersion(String encodedString) {
String versionStr =
encodedString.substring(encodedString.lastIndexOf(",") + 1, encodedString.lastIndexOf("]"));
int pos = versionStr.lastIndexOf("[");
if (pos >= 0) {
versionStr = versionStr.substring(pos + 1);
}
return Integer.parseInt(versionStr.trim());
}
}