package org.apache.solr.store.hdfs;

/*
 * 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 java.io.IOException;

import org.apache.lucene.store.IndexOutput;

/**
 * @lucene.experimental
 */
public class NullIndexOutput extends IndexOutput {
  
  private long pos;
  private long length;
  
  @Override
  public void close() throws IOException {
    
  }
  
  @Override
  public void flush() throws IOException {
    
  }
  
  @Override
  public long getFilePointer() {
    return pos;
  }
  
  @Override
  public void writeByte(byte b) throws IOException {
    pos++;
    updateLength();
  }
  
  @Override
  public void writeBytes(byte[] b, int offset, int length) throws IOException {
    pos += length;
    updateLength();
  }
  
  private void updateLength() {
    if (pos > length) {
      length = pos;
    }
  }

  @Override
  public long getChecksum() throws IOException {
    return 0; // we don't write anything.
  }
}