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/*
 * Copyright (C) 2014-2016 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */

package gobblin.hive;

import java.util.List;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

import gobblin.annotation.Alpha;
import lombok.Getter;


/**
 * A class that represents a Hive partition.
 *
 * 
 *   This class is used in {@link gobblin.hive.spec.HiveSpec} instead of Hive's
 *   {@link org.apache.hadoop.hive.metastore.api.Partition} class to minimize the dependency on the hive-metastore API
 *   (since it is unstable and may go through backward incompatible changes). {@link HivePartition} and Hive's
 *   {@link org.apache.hadoop.hive.metastore.api.Partition} can be converted to each other using
 *   {@link gobblin.hive.metastore.HiveMetaStoreUtils}.
 * 
 *
 * @author ziliu
 */
@Getter
@Alpha
public class HivePartition extends HiveRegistrationUnit {

  private final List values;

  private HivePartition(Builder builder) {
    super(builder);
    this.values = ImmutableList. copyOf(builder.values);
  }

  @Override
  public String toString() {
    return this.values.toString();
  }

  public static class Builder extends HiveRegistrationUnit.Builder {

    private List values = Lists.newArrayList();

    public Builder withPartitionValues(List values) {
      this.values = values;
      return this;
    }

    @Override
    public HivePartition build() {
      return new HivePartition(this);
    }

  }
}