com.opensoc.json.serialization.JSONDecoderHelper.java Source code

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Here is the source code for com.opensoc.json.serialization.JSONDecoderHelper.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.
 */
package com.opensoc.json.serialization;

import java.io.DataInputStream;
import java.io.IOException;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

/**
 * Helper class used for decoding objects from byte arrays 
 *
 * @author kiran
 * 
 */
public class JSONDecoderHelper {

    public static String getString(DataInputStream data) throws IOException {

        int strSize = data.readInt();

        byte[] bytes = new byte[strSize];
        data.read(bytes);
        return new String(bytes);
    }

    public static Number getNumber(DataInputStream data) throws IOException {
        // Treating all ints,shorts, long as long.
        // Everything else as Double
        int flag = data.readByte();
        if (flag == 0)
            return data.readDouble();

        return data.readLong();
    }

    public static Boolean getBoolean(DataInputStream data) throws IOException {

        return data.readBoolean();
    }

    @SuppressWarnings("unchecked")
    public static JSONArray getArray(DataInputStream data) throws IOException {
        // TODO Auto-generated method stub
        JSONArray output = new JSONArray();
        int size = data.readInt();

        for (int i = 0; i < size; i++) {
            Object value = getObject(data);
            output.add(value);
        }

        return output;
    }

    @SuppressWarnings("unchecked")
    public static JSONObject getJSON(DataInputStream data) throws IOException {
        // TODO Auto-generated method stub
        JSONObject output = new JSONObject();
        int size = data.readInt();

        for (int i = 0; i < size; i++) {
            String key = (String) getObject(data);
            Object value = getObject(data);
            output.put(key, value);
        }

        return output;
    }

    public static Object getObject(DataInputStream data) throws IOException {
        // TODO Auto-generated method stub
        byte objID = data.readByte();

        if (objID == JSONKafkaSerializer.StringID)
            return getString(data);

        if (objID == JSONKafkaSerializer.JSONObjectID)
            return getJSON(data);

        if (objID == JSONKafkaSerializer.NumberID)
            return getNumber(data);

        if (objID == JSONKafkaSerializer.BooleanID)
            return getBoolean(data);

        if (objID == JSONKafkaSerializer.NULLID)
            return null;

        if (objID == JSONKafkaSerializer.JSONArrayID)
            return getArray(data);

        return null;
    }

}