org.utgenome.gwt.utgb.client.util.JSONUtil.java Source code

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Here is the source code for org.utgenome.gwt.utgb.client.util.JSONUtil.java

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/*--------------------------------------------------------------------------
 *  Copyright 2007 utgenome.org
 *
 *  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.
 *--------------------------------------------------------------------------*/
//--------------------------------------
// GenomeBrowser Project
//
// JSONUtil.java
// Since: Jul 23, 2007
//
// $URL$ 
// $Author$
//--------------------------------------
package org.utgenome.gwt.utgb.client.util;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;

public class JSONUtil {

    /**
     * Non constractable
     */
    private JSONUtil() {
    }

    /**
     * Create a JSONArray string from the given iterable list
     * 
     * @param iterable
     * @return
     */
    public static <T> String toJSONArray(List<T> iterable) {
        JSONArray array = new JSONArray();
        int index = 0;
        for (Iterator<T> it = iterable.iterator(); it.hasNext();) {
            array.set(index++, new JSONString(it.next().toString()));
        }
        return array.toString();
    }

    public static ArrayList<String> parseJSONArray(String jsonArray) {
        if (jsonArray == null)
            return new ArrayList<String>();

        if (!jsonArray.startsWith("[") || !jsonArray.endsWith("]"))
            throw new IllegalArgumentException("invalid json array data");

        ArrayList<String> elementList = new ArrayList<String>();
        JSONValue v = JSONParser.parse(jsonArray);
        JSONArray array = v.isArray();
        if (array != null) {
            for (int i = 0; i < array.size(); i++)
                elementList.add(toStringValue(array.get(i)));
        }
        return elementList;
    }

    /**
     * Get a string value (without double quotation) of JSONString, or other JSON types.
     * 
     * @param value
     * @return
     */
    public static String toStringValue(JSONValue value) {
        if (value == null)
            return "";

        JSONString str = value.isString();
        if (str != null)
            return str.stringValue();
        else
            return value.toString();
    }

}