content: package org.apache.hadoop.chukwa.pig;
  
  /*
   * 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.
   */
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.TreeMap;
  
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
  import org.apache.hadoop.mapreduce.InputFormat;
  import org.apache.hadoop.mapreduce.RecordReader;
  import org.apache.hadoop.mapreduce.Job;
  import org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader;
  import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
  import org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat;
  import org.apache.hadoop.record.Buffer;
  import org.apache.pig.LoadFunc;
  import org.apache.pig.LoadMetadata;
  import org.apache.pig.ResourceSchema;
  import org.apache.pig.ResourceStatistics;
  import org.apache.pig.Expression;
  import org.apache.pig.impl.logicalLayer.schema.Schema;
  import org.apache.pig.backend.executionengine.ExecException;
  import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigSplit;
  import org.apache.pig.data.DataByteArray;
  import org.apache.pig.data.DefaultTupleFactory;
  import org.apache.pig.data.Tuple;
  import org.apache.pig.data.TupleFactory;
  import org.apache.pig.data.DataType;
  
  
  public class ChukwaLoader extends LoadFunc implements LoadMetadata {
    SequenceFileRecordReader<ChukwaRecordKey, ChukwaRecord> reader;
  
    private TupleFactory tf = DefaultTupleFactory.getInstance();
  
    public ChukwaLoader() {
    }
  
    @Override
    public Tuple getNext() throws IOException {
      ChukwaRecord record = null;
  
      try {
        if (!reader.nextKeyValue()) {
          return null;
        }
      } catch (InterruptedException e) {
          throw new IOException(e);
      }
  
      record = reader.getCurrentValue();
  
      Tuple ret = tf.newTuple(2);
      try
      {
        ret.set(0, new Long(record.getTime()));
  
        HashMap<Object, Object> pigMapFields = new HashMap<Object, Object>();
        TreeMap<String, Buffer> mapFields = record.getMapFields();
  
        if (mapFields != null)
        {
          for (String key : mapFields.keySet())
          {
            pigMapFields.put(key, new DataByteArray(record.getValue(key).getBytes()));
          }
        }
        ret.set(1, pigMapFields);
  
      } catch (ExecException e)
      {
        e.printStackTrace();
        throw new IOException(e);
      }
      return ret;
    }
  
    @Override
    public ResourceSchema getSchema(String s, Job job) throws IOException {
      Schema newSchema =  new Schema();
      newSchema.add(new Schema.FieldSchema("timestamp", DataType.LONG));
      newSchema.add(new Schema.FieldSchema("map", DataType.MAP));
      return new ResourceSchema(newSchema);
    }
  
    @Override
    public ResourceStatistics getStatistics(String s, Job job) throws IOException {
      return null;
    }
  
    @Override
    public String[] getPartitionKeys(String s, Job job) throws IOException {
      return null;
    }
  
    @Override
    public void setPartitionFilter(Expression expression) throws IOException {
    }
  
    @SuppressWarnings("unchecked")
    @Override
    public InputFormat getInputFormat() throws IOException {
      return new SequenceFileInputFormat<ChukwaRecordKey, ChukwaRecord>();
    }
  
    @SuppressWarnings("unchecked")
    @Override
    public void prepareToRead(RecordReader reader, PigSplit split) throws IOException {
      this.reader = (SequenceFileRecordReader)reader;
    }
  
    @Override
    public void setLocation(String location, Job job) throws IOException {
      FileInputFormat.setInputPaths(job, location);
    }
  }