lucene-java-3.4.0/lucene/src/java/org/apache/lucene/index/CharBlockPool.java

   1 package org.apache.lucene.index;
   2
   3 /**
   4  * Licensed to the Apache Software Foundation (ASF) under one or more
   5  * contributor license agreements.  See the NOTICE file distributed with
   6  * this work for additional information regarding copyright ownership.
   7  * The ASF licenses this file to You under the Apache License, Version 2.0
   8  * (the "License"); you may not use this file except in compliance with
   9  * the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 import static org.apache.lucene.util.RamUsageEstimator.NUM_BYTES_OBJECT_REF;
  21 import org.apache.lucene.util.ArrayUtil;
  22
  23 final class CharBlockPool {
  24
  25   public char[][] buffers = new char[10][];
  26   int numBuffer;
  27
  28   int bufferUpto = -1;                        // Which buffer we are upto
  29   public int charUpto = DocumentsWriter.CHAR_BLOCK_SIZE;             // Where we are in head buffer
  30
  31   public char[] buffer;                              // Current head buffer
  32   public int charOffset = -DocumentsWriter.CHAR_BLOCK_SIZE;          // Current head offset
  33   final private DocumentsWriter docWriter;
  34
  35   public CharBlockPool(DocumentsWriter docWriter) {
  36     this.docWriter = docWriter;
  37   }
  38
  39   public void reset() {
  40     docWriter.recycleCharBlocks(buffers, 1+bufferUpto);
  41     bufferUpto = -1;
  42     charUpto = DocumentsWriter.CHAR_BLOCK_SIZE;
  43     charOffset = -DocumentsWriter.CHAR_BLOCK_SIZE;
  44   }
  45
  46   public void nextBuffer() {
  47     if (1+bufferUpto == buffers.length) {
  48       char[][] newBuffers = new char[ArrayUtil.oversize(buffers.length+1,
  49                                                         NUM_BYTES_OBJECT_REF)][];
  50       System.arraycopy(buffers, 0, newBuffers, 0, buffers.length);
  51       buffers = newBuffers;
  52     }
  53     buffer = buffers[1+bufferUpto] = docWriter.getCharBlock();
  54     bufferUpto++;
  55
  56     charUpto = 0;
  57     charOffset += DocumentsWriter.CHAR_BLOCK_SIZE;
  58   }
  59 }
  60