content: /*
   * 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;
  
  
  import java.util.*;
  import org.apache.hadoop.io.DataOutputBuffer;
  import java.io.*;
  
  /**
   * Right now, just handles record collection.
   * 
   */
  public class ChunkBuilder {
  
    ArrayList<Integer> recOffsets = new ArrayList<Integer>();
    int lastRecOffset = -1;
    DataOutputBuffer buf = new DataOutputBuffer();
  
    /**
     * Adds the data in rec to an internal buffer; rec can be reused immediately.
     * 
     * @param rec is byte array of data
     */
    public void addRecord(byte[] rec) {
      lastRecOffset = lastRecOffset + rec.length;
      recOffsets.add(lastRecOffset);
      try {
        buf.write(rec);
      } catch (IOException e) {
        throw new RuntimeException("buffer write failed.  Out of memory?", e);
      }
    }
  
    public Chunk getChunk() {
      ChunkImpl c = new ChunkImpl();
      c.setData(buf.getData());
      c.setSeqID(buf.getLength());
      int[] offsets = new int[recOffsets.size()];
      for (int i = 0; i < offsets.length; ++i)
        offsets[i] = recOffsets.get(i);
      c.setRecordOffsets(offsets);
  
      return c;
    }
  
  }
  