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      1 /*******************************************************************************
      2  * Copyright (c) 2011 Google, Inc.
      3  * All rights reserved. This program and the accompanying materials
      4  * are made available under the terms of the Eclipse Public License v1.0
      5  * which accompanies this distribution, and is available at
      6  * http://www.eclipse.org/legal/epl-v10.html
      7  *
      8  * Contributors:
      9  *    Google, Inc. - initial API and implementation
     10  *******************************************************************************/
     11 package org.eclipse.wb.internal.core.utils;
     12 
     13 import com.google.common.base.Objects;
     14 
     15 /**
     16  * Pair of two objects.
     17  *
     18  * @author scheglov_ke
     19  * @coverage core.util
     20  */
     21 public final class Pair<L, R> {
     22   private final L left;
     23   private final R right;
     24 
     25   ////////////////////////////////////////////////////////////////////////////
     26   //
     27   // Constructor
     28   //
     29   ////////////////////////////////////////////////////////////////////////////
     30   public Pair(L left, R right) {
     31     this.left = left;
     32     this.right = right;
     33   }
     34 
     35   ////////////////////////////////////////////////////////////////////////////
     36   //
     37   // Object
     38   //
     39   ////////////////////////////////////////////////////////////////////////////
     40   @Override
     41   public boolean equals(Object o) {
     42     if (o == this) {
     43       return true;
     44     }
     45     if (!(o instanceof Pair<?, ?>)) {
     46       return false;
     47     }
     48     Pair<?, ?> other = (Pair<?, ?>) o;
     49     return Objects.equal(getLeft(), other.getLeft())
     50         && Objects.equal(getRight(), other.getRight());
     51   }
     52 
     53   @Override
     54   public int hashCode() {
     55     int hLeft = getLeft() == null ? 0 : getLeft().hashCode();
     56     int hRight = getRight() == null ? 0 : getRight().hashCode();
     57     return hLeft + 37 * hRight;
     58   }
     59 
     60   ////////////////////////////////////////////////////////////////////////////
     61   //
     62   // Access
     63   //
     64   ////////////////////////////////////////////////////////////////////////////
     65   public L getLeft() {
     66     return left;
     67   }
     68 
     69   public R getRight() {
     70     return right;
     71   }
     72 
     73   ////////////////////////////////////////////////////////////////////////////
     74   //
     75   // Factory
     76   //
     77   ////////////////////////////////////////////////////////////////////////////
     78   public static <L, R> Pair<L, R> create(L left, R right) {
     79     return new Pair<L, R>(left, right);
     80   }
     81 }