content: package org.apache.lucene.store;
  
  /**
   * 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 org.apache.lucene.util.BytesRef;
  
  /**
   * @lucene.experimental
   */
  public class ByteArrayDataOutput extends DataOutput {
    private byte[] bytes;
  
    private int pos;
    private int limit;
  
    public ByteArrayDataOutput(byte[] bytes) {
      reset(bytes);
    }
  
    public ByteArrayDataOutput(byte[] bytes, int offset, int len) {
      reset(bytes, offset, len);
    }
  
    public ByteArrayDataOutput() {
      reset(BytesRef.EMPTY_BYTES);
    }
  
    public void reset(byte[] bytes) {
      reset(bytes, 0, bytes.length);
    }
    
    public void reset(byte[] bytes, int offset, int len) {
      this.bytes = bytes;
      pos = offset;
      limit = offset + len;
    }
    
    public int getPosition() {
      return pos;
    }
  
    @Override
    public void writeByte(byte b) {
      assert pos < limit;
      bytes[pos++] = b;
    }
  
    @Override
    public void writeBytes(byte[] b, int offset, int length) {
      assert pos + length <= limit;
      System.arraycopy(b, offset, bytes, pos, length);
      pos += length;
    }
  }
  