content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.job.plan.transform;
  
  import alluxio.job.plan.PlanConfig;
  
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.common.base.MoreObjects;
  import com.google.common.base.Objects;
  import com.google.common.base.Preconditions;
  import com.google.common.collect.ImmutableList;
  
  import java.util.Collection;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * Configuration for a job to compact files directly under a directory.
   *
   * Files will be compacted into a certain number of files,
   * if the number of existing files is less than the specified number, then no compaction happens,
   * otherwise, assume we want to compact 100 files to 10 files, then every 10 files will be
   * compacted into one file.
   * The original order of rows is preserved.
   */
  @ThreadSafe
  public final class CompactConfig implements PlanConfig {
    private static final long serialVersionUID = -3434270994964559796L;
  
    private static final String NAME = "Compact";
  
    private final PartitionInfo mInputPartitionInfo;
    /**
     * Files directly under this directory are compacted.
     */
    private final String mInput;
  
    private final PartitionInfo mOutputPartitionInfo;
    /**
     * Compacted files are stored under this directory.
     */
    private final String mOutput;
    /**
     * Max number of files after compaction.
     */
    private final int mMaxNumFiles;
    /**
     * Minimum file size for compaction.
     */
    private final long mMinFileSize;
  
    /**
     * @param inputPartitionInfo the input partition info
     * @param input the input directory
     * @param outputPartitionInfo the output partition info
     * @param output the output directory
     * @param maxNumFiles the maximum number of files after compaction
     * @param minFileSize the minimum file size for coalescing
     */
    public CompactConfig(@JsonProperty("inputPartitionInfo") PartitionInfo inputPartitionInfo,
                         @JsonProperty("input") String input,
                         @JsonProperty("outputPartitionInfo") PartitionInfo outputPartitionInfo,
                         @JsonProperty("output") String output,
                         @JsonProperty("maxNumFiles") Integer maxNumFiles,
                         @JsonProperty("minFileSize") Long minFileSize) {
      mInputPartitionInfo = inputPartitionInfo;
      mInput = Preconditions.checkNotNull(input, "input");
      mOutputPartitionInfo = outputPartitionInfo;
      mOutput = Preconditions.checkNotNull(output, "output");
      mMaxNumFiles = Preconditions.checkNotNull(maxNumFiles, "maxNumFiles");
      mMinFileSize = Preconditions.checkNotNull(minFileSize, "minFileSize");
    }
  
    /**
     * @return the input partition info
     */
    public PartitionInfo getInputPartitionInfo() {
      return mInputPartitionInfo;
    }
  
    /**
     * @return the output partition info
     */
    public PartitionInfo getOutputPartitionInfo() {
      return mOutputPartitionInfo;
    }
  
    /**
     * @return the input directory
     */
    public String getInput() {
      return mInput;
    }
  
    /**
     * @return the output directory
     */
    public String getOutput() {
      return mOutput;
    }
  
    /**
     * @return the number of files after compaction
     */
    public int getMaxNumFiles() {
      return mMaxNumFiles;
    }
  
    /**
     * @return the file size
     */
    public long getMinFileSize() {
      return mMinFileSize;
    }
  
    @Override
    public boolean equals(Object obj) {
      if (obj == null) {
        return false;
      }
      if (this == obj) {
        return true;
      }
      if (!(obj instanceof CompactConfig)) {
        return false;
      }
      CompactConfig that = (CompactConfig) obj;
      return mInputPartitionInfo.equals(that.mInputPartitionInfo)
          && mOutputPartitionInfo.equals(that.mOutputPartitionInfo)
          && mInput.equals(that.mInput)
          && mOutput.equals(that.mOutput)
          && mMaxNumFiles == that.mMaxNumFiles
          && mMinFileSize == that.mMinFileSize;
    }
  
    @Override
    public int hashCode() {
      return Objects.hashCode(mInputPartitionInfo, mOutputPartitionInfo, mInput, mOutput,
          mMaxNumFiles, mMinFileSize);
    }
  
    @Override
    public String toString() {
      return MoreObjects.toStringHelper(this)
          .add("input", mInput)
          .add("output", mOutput)
          .add("maxNumFiles", mMaxNumFiles)
          .add("minFileSize", mMinFileSize)
          .add("inputPartitionInfo", mInputPartitionInfo)
          .add("outputPartitionInfo", mOutputPartitionInfo)
          .toString();
    }
  
    @Override
    public String getName() {
      return NAME;
    }
  
    @Override
    public Collection<String> affectedPaths() {
      return ImmutableList.of(mInput, mOutput);
    }
  }
  