content: package org.apache.lucene.index;
  
  /**
   * 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 static org.apache.lucene.util.RamUsageEstimator.NUM_BYTES_OBJECT_REF;
  import org.apache.lucene.util.ArrayUtil;
  
  final class CharBlockPool {
  
    public char[][] buffers = new char[10][];
    int numBuffer;
  
    int bufferUpto = -1;                        // Which buffer we are upto
    public int charUpto = DocumentsWriter.CHAR_BLOCK_SIZE;             // Where we are in head buffer
  
    public char[] buffer;                              // Current head buffer
    public int charOffset = -DocumentsWriter.CHAR_BLOCK_SIZE;          // Current head offset
    final private DocumentsWriter docWriter;
  
    public CharBlockPool(DocumentsWriter docWriter) {
      this.docWriter = docWriter;
    }
  
    public void reset() {
      docWriter.recycleCharBlocks(buffers, 1+bufferUpto);
      bufferUpto = -1;
      charUpto = DocumentsWriter.CHAR_BLOCK_SIZE;
      charOffset = -DocumentsWriter.CHAR_BLOCK_SIZE;
    }
  
    public void nextBuffer() {
      if (1+bufferUpto == buffers.length) {
        char[][] newBuffers = new char[ArrayUtil.oversize(buffers.length+1,
                                                          NUM_BYTES_OBJECT_REF)][];
        System.arraycopy(buffers, 0, newBuffers, 0, buffers.length);
        buffers = newBuffers;
      }
      buffer = buffers[1+bufferUpto] = docWriter.getCharBlock();
      bufferUpto++;
  
      charUpto = 0;
      charOffset += DocumentsWriter.CHAR_BLOCK_SIZE;
    }
  }
  
  