com.uber.hoodie.common.table.log.block.HoodieCommandBlock Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 Uber Technologies, Inc. ([email protected])
 *
 * Licensed 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 com.uber.hoodie.common.table.log.block;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * Command block issues a specific command to the scanner
 */
public class HoodieCommandBlock implements HoodieLogBlock {

  private final HoodieCommandBlockTypeEnum type;

  public enum HoodieCommandBlockTypeEnum {ROLLBACK_PREVIOUS_BLOCK}

  public HoodieCommandBlock(HoodieCommandBlockTypeEnum type) {
    this.type = type;
  }

  @Override
  public byte[] getBytes() throws IOException {
    return ByteBuffer.allocate(4).putInt(type.ordinal()).array();
  }

  public HoodieCommandBlockTypeEnum getType() {
    return type;
  }

  @Override
  public HoodieLogBlockType getBlockType() {
    return HoodieLogBlockType.COMMAND_BLOCK;
  }

  public static HoodieLogBlock fromBytes(byte[] content) {
    int ordinal = ByteBuffer.wrap(content).getInt();
    return new HoodieCommandBlock(HoodieCommandBlockTypeEnum.values()[ordinal]);
  }
}