content: /**
   * Copyright 2010 Karthik Kumar
   *
   * 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.hbasene.index;
  
  import java.util.List;
  
  import org.apache.hadoop.hbase.util.Bytes;
  
  /**
   * Binary encoding of the term positions and constant time retrieval,
   * for the term frequencies
   */
  public class AlphaTermPositionsEncoder extends AbstractTermPositionsEncoder {
  
    @Override
    int[] decode(byte[] value) {
      int length = (value.length / Bytes.SIZEOF_INT);
      int [] result = new int[length];
      for (int i = 0 ; i < length ; ++i) {
        result[i] = Bytes.toInt(value, i * Bytes.SIZEOF_INT);
      }
      return result;
    }
  
    @Override
    byte[] encode(List<Integer> termPositions) {
      byte[] encoded = new byte[termPositions.size() * Bytes.SIZEOF_INT];
      for (int i = 0 ; i < termPositions.size() ; ++i) {
        Bytes.putInt(encoded, i * Bytes.SIZEOF_INT, termPositions.get(i));
      }
      return encoded;
    }
  
    @Override
    int getTermFrequency(byte[] termPositions) {
      return (termPositions.length / Bytes.SIZEOF_INT);
    }
  
  }
  