com.endgame.binarypig.util.JsonUtil.java Source code

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Here is the source code for com.endgame.binarypig.util.JsonUtil.java

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/**
 * 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.
 *
 *  Copyright 2013 Endgame Inc.
 *
 */

package com.endgame.binarypig.util;

import java.util.Map;

import org.apache.pig.data.DataBag;
import org.apache.pig.data.NonSpillableDataBag;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

import com.google.common.collect.Maps;

public class JsonUtil {

    final protected TupleFactory tupleFactory = TupleFactory.getInstance();

    /**
     * Note: copied from elephantbird pig JsonLoader
     */
    boolean isNestedLoadEnabled = true;

    public Object wrap(Object value) {

        if (isNestedLoadEnabled && value instanceof JSONObject) {
            return walkJson((JSONObject) value);
        } else if (isNestedLoadEnabled && value instanceof JSONArray) {

            JSONArray a = (JSONArray) value;
            DataBag mapValue = new NonSpillableDataBag(a.size());
            for (int i = 0; i < a.size(); i++) {
                Tuple t = tupleFactory.newTuple(wrap(a.get(i)));
                mapValue.add(t);
            }
            return mapValue;

        } else {
            return value != null ? value.toString() : null;
        }
    }

    /**
     * Note: copied from elephantbird pig JsonLoader
     */
    public Map<String, Object> walkJson(JSONObject jsonObj) {
        Map<String, Object> v = Maps.newHashMap();
        for (Object key : jsonObj.keySet()) {
            v.put(key.toString(), wrap(jsonObj.get(key)));
        }
        return v;
    }
}