Pair.java

Go to the documentation of this file.

// Copyright 2012 Cloudera Inc.
//
// 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.cloudera.impala.common;

public class Pair<F, S> {
  public F first;
  public S second;

  public Pair(F first, S second) {
    this.first = first;
    this.second = second;
  }

  @Override
  public boolean equals(Object o) {
    if (o instanceof Pair) {
      Pair<F,S> other = (Pair<F,S>) o;
      return this.first.equals(other.first) && this.second.equals(other.second);
    }
    return false;
  }

  @Override
  public int hashCode() {
    int hashFirst = first != null ? first.hashCode() : 0;
    int hashSecond = second != null ? second.hashCode() : 0;

    return (hashFirst + hashSecond) * hashSecond + hashFirst;
  }

  static public <F, S> Pair<F, S> create(F first, S second) {
    return new Pair<F, S>(first, second);
  }
}