org.altlaw.hadoop.JsonReader.java Source code

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Here is the source code for org.altlaw.hadoop.JsonReader.java

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/* TarToSeqFile.java - Convert tar files into Hadoop SequenceFiles.
 *
 * Copyright (C) 2008 Stuart Sierra
 *
 * 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.
 */

package org.altlaw.hadoop;

/* From ant.jar, http://ant.apache.org/ */
import org.apache.tools.bzip2.CBZip2InputStream;
import org.apache.tools.tar.TarEntry;
import org.apache.tools.tar.TarInputStream;

/* From hadoop-*-core.jar, http://hadoop.apache.org/
 * Developed with Hadoop 0.16.3. */
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.Text;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.util.zip.GZIPInputStream;
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
//import java.io.File;
//import java.io.FileInputStream;
import java.io.InputStreamReader;

import org.json.simple.JSONObject;
import org.json.simple.JSONValue;

/**
 * @author SHIBAO KOUICHIRO  <shibacow@gmail.com>
 * Parase JSON add INFO
 * ????SMID??SequenceFile??
 */

public class JsonReader {
    public JsonReader() {

    }

    private String getSMID(String stm) {
        String[] basenames = stm.split("/", -1);
        int sz = basenames.length;
        String basename = basenames[sz - 1];
        String filename = basename.split("\\.", -1)[0];
        return filename;
    }

    private void appendStringToOuput(String k, String v, SequenceFile.Writer output) throws IOException {
        Text key = new Text(k);
        BytesWritable value = new BytesWritable(v.getBytes());
        output.append(key, value);
    }

    public void addSmidInJson(String src, String filename, SequenceFile.Writer output) throws Exception {
        InputStreamReader isr = new InputStreamReader(new FileInputStream(src));
        BufferedReader br = new BufferedReader(isr);
        String line;
        StringBuffer strings = new StringBuffer();
        while ((line = br.readLine()) != null) {
            JSONObject obj = (JSONObject) JSONValue.parse(line);
            obj.put("filename", filename);
            obj.put("video_id", this.getSMID(filename));
            StringWriter out = new StringWriter();
            obj.writeJSONString(out);
            String jsonText = out.toString();
            this.appendStringToOuput(filename, jsonText, output);
        }
        br.close();
        isr.close();
    }
}