/*
    * Copyright 2021 TiKV Project Authors.
    *
    * 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 org.tikv.common.util;
  
  import com.google.protobuf.ByteString;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.tikv.common.region.TiRegion;
  
  /** A Batch containing the region, a list of keys and/or values to send */
  public class Batch {
    private final BackOffer backOffer;
    private final TiRegion region;
    private final List<ByteString> keys;
    private final List<ByteString> values;
    private final Map<ByteString, ByteString> map;
  
    public Batch(BackOffer backOffer, TiRegion region, List<ByteString> keys) {
      this.backOffer = ConcreteBackOffer.create(backOffer);
      this.region = region;
      this.keys = keys;
      this.values = null;
      this.map = null;
    }
  
    public Batch(
        BackOffer backOffer, TiRegion region, List<ByteString> keys, List<ByteString> values) {
      this.backOffer = ConcreteBackOffer.create(backOffer);
      this.region = region;
      this.keys = keys;
      this.values = values;
      this.map = toMap(keys, values);
    }
  
    private Map<ByteString, ByteString> toMap(List<ByteString> keys, List<ByteString> values) {
      assert keys.size() == values.size();
      Map<ByteString, ByteString> kvMap = new HashMap<>();
      for (int i = 0; i < keys.size(); i++) {
        kvMap.put(keys.get(i), values.get(i));
      }
      return kvMap;
    }
  
    public BackOffer getBackOffer() {
      return ConcreteBackOffer.create(backOffer);
    }
  
    public TiRegion getRegion() {
      return region;
    }
  
    public List<ByteString> getKeys() {
      return keys;
    }
  
    public List<ByteString> getValues() {
      return values;
    }
  
    public Map<ByteString, ByteString> getMap() {
      return map;
    }
  }