RELEASE_2_1_13/src/java/org/apache/cocoon/components/flow/javascript/JavaScriptFlowHelper.java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.cocoon.components.flow.javascript;

import org.apache.cocoon.components.flow.FlowHelper;

import org.mozilla.javascript.Undefined;
import org.mozilla.javascript.Wrapper;

public class JavaScriptFlowHelper extends FlowHelper {

    /**
     * Unwrap a Rhino object (getting the raw java object) and convert undefined to null
     * @since 2.1.10
     */
    public static Object unwrap(Object obj) {
        if (obj instanceof Wrapper) {
            obj = ((Wrapper)obj).unwrap();
        } else if (obj == Undefined.instance) {
            obj = null;
        }
        return obj;
    }

}