/**
* Copyright 2010 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 org.waveprotocol.wave.communication.gwt;
import com.google.gwt.core.client.JavaScriptObject;
import org.waveprotocol.wave.communication.json.JsonLongHelper;
/**
* This code wraps around a long value so that it can be transmitted efficiently
* over the wire. long value is sent as a pair of integers beause JSON doesn't
* support 64bit long values.
*
*/
public final class JsLong extends JavaScriptObject {
/** hidden constructor */
protected JsLong() {
}
/**
* @param value
* @return a new JsLong representation of the long
*/
public static JsLong create(long value) {
return toJavaScriptObject(JsonLongHelper.getHighWord(value),
JsonLongHelper.getLowWord(value));
}
/**
* @return the long value represented by this JavaScriptObject
*/
public long toLong() {
return JsonLongHelper.toLong(getHighInt(this), getLowInt(this));
}
private static native int getLowInt(JavaScriptObject obj) /*-{
return obj[
@org.waveprotocol.wave.communication.json.JsonLongHelper::LOW_WORD_INDEX
];
}-*/;
private static native int getHighInt(JavaScriptObject obj) /*-{
return obj[
@org.waveprotocol.wave.communication.json.JsonLongHelper::HIGH_WORD_INDEX
];
}-*/;
private static native JsLong toJavaScriptObject(int highInt, int lowInt) /*-{
return [lowInt, highInt];
}-*/;
}