Source code

001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.network.util;
020
021import java.io.Serializable;
022
023public final class Pair<T1, T2> implements Serializable {
024
025  public final T1 first;
026  public final T2 second;
027
028  private String pairStr = null;
029
030  public Pair(final T1 first, final T2 second) {
031    this.first = first;
032    this.second = second;
033  }
034
035  @Override
036  public String toString() {
037    if (this.pairStr == null) {
038      this.pairStr = "(" + this.first + "," + this.second + ")";
039    }
040    return this.pairStr;
041  }
042}