/*
 * Copyright (c) 2011-2014 Fernando Petrola
 *
 * 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 dragome.javascript;


public class JSObject<T>
{
    public static Object getProperty(Object obj, String propertyName)
    {
	ScriptHelper.put("obj", obj, null);
	ScriptHelper.put("propertyName", propertyName, null);
	return ScriptHelper.eval("obj[propertyName]", null);
    }

    public static boolean containsKey(Object obj, String propertyName)
    {
	ScriptHelper.put("obj", obj, null);
	ScriptHelper.put("propertyName", propertyName, null);
	// Warning: Cannot use (obj[propertyName] != undefined) because
	// (null == undefined) evaluates to true.
	return ScriptHelper.evalBoolean("typeof(obj[propertyName]) != 'undefined'", null);
    }

    public JSObject()
    {
	ScriptHelper.evalNoResult("this.obj = new Object()", null);
    }

    public JSObject(Object obj)
    {
	ScriptHelper.put("obj", obj, null);
	ScriptHelper.evalNoResult("this.obj = obj", null);
    }

    public JSObject(String javascriptRef)
    {
	ScriptHelper.put("javascriptRef", javascriptRef, null);
	ScriptHelper.evalNoResult("this.obj = eval(javascriptRef)", null);
    }

    public boolean containsKey(String propertyName)
    {
	return containsKey(ScriptHelper.eval("this.obj", null), propertyName);
    }

    public T get(String key)
    {
	ScriptHelper.put("key", key, null);
	if (containsKey(ScriptHelper.eval("this.obj", null), key))
	{
	    return (T) ScriptHelper.eval("this.obj[key]", null);
	}
	return null;
    }

    public void put(String key, T value)
    {
	ScriptHelper.put("key", key, null);
	ScriptHelper.put("value", value, null);
	ScriptHelper.evalNoResult("this.obj[key] = value", null);
    }

    public void remove(String key)
    {
	ScriptHelper.put("key", key, null);
	ScriptHelper.evalNoResult("delete this.obj[key]", null);
    }

    public String[] keys()
    {
	ScriptHelper.evalNoResult("var keys = new Array(); for (var e in this.obj) keys.push(e)", null);
	return (String[]) ScriptHelper.eval("keys", null);
    }
}