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// Copyright (C) 2012 The Android Open Source Project
//
// 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.gerrit.client.rpc;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.json.client.JSONObject;
import java.util.AbstractList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
public class Natives {
/**
* Get the names of defined properties on the object. The returned set
* iterates in the native iteration order, which may match the source order.
*/
public static Set<String> keys(JavaScriptObject obj) {
if (obj != null) {
return new JSONObject(obj).keySet();
}
return Collections.emptySet();
}
public static <T extends JavaScriptObject> List<T> asList(
final JsArray<T> arr) {
if (arr == null) {
return null;
}
return new AbstractList<T>() {
@Override
public T set(int index, T element) {
T old = arr.get(index);
arr.set(index, element);
return old;
}
@Override
public T get(int index) {
return arr.get(index);
}
@Override
public int size() {
return arr.length();
}
};
}
public static <T extends JavaScriptObject> JsArray<T> arrayOf(T element) {
JsArray<T> arr = JavaScriptObject.createArray().cast();
arr.push(element);
return arr;
}
@SuppressWarnings("unchecked")
public static <T extends JavaScriptObject> T parseJSON(String json) {
if (json.startsWith("\"")) {
return (T) NativeString.wrap(parseString(parser, json));
}
return Natives.<T> parseObject(parser, json); // javac generics bug
}
private static native <T extends JavaScriptObject>
T parseObject(JavaScriptObject p, String s)
/*-{ return p(s); }-*/;
private static native
String parseString(JavaScriptObject p, String s)
/*-{ return p(s); }-*/;
private static JavaScriptObject parser;
private static native JavaScriptObject bestJsonParser()
/*-{
if ($wnd.JSON && typeof $wnd.JSON.parse === 'function')
return $wnd.JSON.parse;
return function(s) { return eval('(' + s + ')'); };
}-*/;
static {
parser = bestJsonParser();
}
private Natives() {
}
}