1 /* 2 * File: EqualsUtil.java 3 * Created: 13.10.2006 8:52:33 4 * 5 * Copyright 2006 Michal Burda. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 package net.sf.webmancer.util; 22 23 import java.util.Arrays; 24 25 /** 26 * @see Arrays 27 * 28 * @author Michal Burda 29 */ 30 public class EqualsUtil { 31 /** 32 * Prevent instantiation 33 */ 34 private EqualsUtil() { 35 } 36 37 /** 38 * @param first 39 * @param second 40 * @return 41 */ 42 static public boolean areEqual(boolean first, boolean second) { 43 return first == second; 44 } 45 46 /** 47 * @param first 48 * @param second 49 * @return 50 */ 51 static public boolean areEqual(char first, char second) { 52 return first == second; 53 } 54 55 /** 56 * @param first 57 * @param second 58 * @return 59 */ 60 static public boolean areEqual(long first, long second) { 61 return first == second; 62 } 63 64 /** 65 * @param first 66 * @param second 67 * @return 68 */ 69 static public boolean areEqual(float first, float second) { 70 return Float.floatToIntBits(first) == Float.floatToIntBits(second); 71 } 72 73 /** 74 * @param first 75 * @param second 76 * @return 77 */ 78 static public boolean areEqual(double first, double second) { 79 return Double.doubleToLongBits(first) == Double.doubleToLongBits(second); 80 } 81 82 /** 83 * This method implements a <code>null</code> value safe comparison of two objects. If the two given parameters 84 * are both <code>null</code>, the method returns <code>true</code>. If either parameter is <code>null</code> 85 * while the other is not <code>null</code>, the method returns <code>false</code>. In the other case, a first 86 * parameter's {@link Object#equals(Object)} method is called and the result is returned. 87 * 88 * @param o1 First object to be compared or <code>null</code> 89 * @param o2 Second object to be compared or <code>null</code> 90 * @return <code>true</code> iff both parameters are <code>null</code> or they equal accordingly to 91 * {@link Object#equals(Object)} 92 */ 93 public static boolean areEqual(final Object o1, final Object o2) { 94 if (o1 != null) { 95 return o1.equals(o2); 96 } else { 97 return (o2 == null); 98 } 99 } 100 101 }