src/main/java/org/apache/hadoop/chukwa/hicc/JSONLoader.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.hadoop.chukwa.hicc;


import java.net.*;
import java.nio.charset.Charset;
import java.text.ParseException;
import java.io.*;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
import org.apache.log4j.Logger;
import org.apache.hadoop.chukwa.util.ExceptionUtil;

public class JSONLoader {
  public JSONArray jsonData;
  private static Logger log = Logger.getLogger(JSONLoader.class);

  static public String getContents(String source) {
    // ...checks on aFile are elided
    StringBuffer contents = new StringBuffer();

    try {
      // use buffering, reading one line at a time
      // FileReader always assumes default encoding is OK!
      URL yahoo = new URL(source);
      BufferedReader in = new BufferedReader(new InputStreamReader(yahoo
          .openStream(), Charset.forName("UTF-8")));

      String inputLine;

      while ((inputLine = in.readLine()) != null) {
        contents.append(inputLine);
        contents.append(System.getProperty("line.separator"));
      }
      in.close();
    } catch (IOException ex) {
      ex.printStackTrace();
    }

    return contents.toString();
  }

  public JSONLoader(String source) {
    String buffer = getContents(source);
    try {
      JSONObject rows = (JSONObject) JSONValue.parse(buffer);
      jsonData = (JSONArray) JSONValue.parse(rows.get("rows").toString());
    } catch (Exception e) {
      log.debug(ExceptionUtil.getStackTrace(e)); 
    }
  }

  public String getTS(int i) {
    String ts = null;
    try {
      ts = ((JSONObject) jsonData.get(i)).get("ts").toString();
    } catch (Exception e) {
      log.debug(ExceptionUtil.getStackTrace(e)); 
    }
    return ts;
  }

  public String getTags(int i) {
    String tags = null;
    try {
      tags = ((JSONObject) jsonData.get(i)).get("tags")
          .toString();
    } catch (Exception e) {
      log.debug(ExceptionUtil.getStackTrace(e)); 
    }
    return tags;
  }

  public String getValue(int i) {
    String value = null;
    try {
      value = ((JSONObject) jsonData.get(i)).get("value")
          .toString();
    } catch (Exception e) {
      log.debug(ExceptionUtil.getStackTrace(e)); 
    }
    return value;
  }

  public int length() {
    return jsonData.size();
  }
}