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/*
 * 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.apache.ratis.datastream.impl;

import org.apache.ratis.io.FilePositionCount;
import org.apache.ratis.io.WriteOption;
import org.apache.ratis.protocol.DataStreamRequest;
import org.apache.ratis.protocol.DataStreamRequestHeader;

import java.util.List;

/**
 * Implements {@link DataStreamRequest} with {@link FilePositionCount}.
 * 
 * This class is immutable.
 */
public class DataStreamRequestFilePositionCount extends DataStreamPacketImpl implements DataStreamRequest {
  private final FilePositionCount file;
  private final List options;

  public DataStreamRequestFilePositionCount(DataStreamRequestHeader header, FilePositionCount file) {
    super(header.getClientId(), header.getType(), header.getStreamId(), header.getStreamOffset());
    this.options = header.getWriteOptionList();
    this.file = file;
  }

  @Override
  public long getDataLength() {
    return file.getCount();
  }

  /** @return the file with the starting position and the byte count. */
  public FilePositionCount getFile() {
    return file;
  }

  @Override
  public List getWriteOptionList() {
    return options;
  }
}