org.eclipse.orion.server.cf.utils.MagicJSONObject.java Source code

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Here is the source code for org.eclipse.orion.server.cf.utils.MagicJSONObject.java

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/*******************************************************************************
 * Copyright (c) 2013 IBM Corporation and others 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.orion.server.cf.utils;

import org.json.JSONException;
import org.json.JSONObject;

public class MagicJSONObject extends JSONObject {

    public MagicJSONObject(String json) throws JSONException {
        super(json);
    }

    public JSONObject putOnce(String key, Object value) throws JSONException {
        Object storedValue;
        if (key != null && value != null) {
            if ((storedValue = this.opt(key)) != null) {
                if (!storedValue.equals(value)) // Throw if values are different
                    throw new JSONException("Duplicate key \"" + key + "\"");
                else
                    return this;
            }
            this.put(key, value);
        }
        return this;
    }
}