FsEntryJsonInputFormat.java

/*
Copyright 2011, Lightbox Technologies, Inc

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 com.lightboxtechnologies.spectrum;

import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.LineRecordReader;

import java.util.Date;
import java.util.Map;
import java.util.Set;
import java.util.List;
import java.io.IOException;

public class FsEntryJsonInputFormat extends FileInputFormat implements Configurable {

  private Configuration    Conf;

  public Configuration getConf() {
    return Conf;
  }

  public void setConf(Configuration c) {
    Conf = c;
  }

  public RecordReader<Text, FsEntry> createRecordReader(InputSplit split, TaskAttemptContext ctx) throws IOException {
    return new FsEntryRecordReader();
  }

  public static class FsEntryRecordReader extends RecordReader<Text, FsEntry> {
    private final LineRecordReader Liner;
    private final Text Key;
    private Text Line;
    private final FsEntry Value;

    public FsEntryRecordReader() {
      Liner = new LineRecordReader();
      Key = new Text();
      Line = new Text();
      Value = new FsEntry();
    }

    public void close() throws IOException {
      Liner.close();
    }

    public float getProgress() {
      return Liner.getProgress();
    }

    public void initialize(InputSplit split, TaskAttemptContext ctx) throws IOException {
      Liner.initialize(split, ctx);
    }

    public boolean nextKeyValue() throws IOException {
      if (Liner.nextKeyValue()) {
        Line = Liner.getCurrentValue();
        Value.parseJson(Line.toString());
        Key.set(Value.getID());
        return true;
      }
      else {
        return false;
      }
    }

    public Text getCurrentKey() throws IOException, InterruptedException {
      return Key;
    }

    public FsEntry getCurrentValue() throws IOException, InterruptedException {
      return Value;
    }
  }
}