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/* |
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$Id $ |
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Copyright (C) 2010 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util; |
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import java.util.List; |
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|
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/** |
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Helper class for implementing equals and hash code calculations in |
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classes. |
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@author nicklas |
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@since 2.15 |
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*/ |
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public class EqualsHelper |
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{ |
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|
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/** |
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Check if two objects are equal according to their equals |
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implementation. This method is safe to use with null values |
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and returns true if both objects are null. Otherwise, |
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it calls o1.equals(o2). |
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|
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@param o1 The first object |
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@param o2 The second object |
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@return TRUE if the objects are equal |
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*/ |
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public static boolean equals(Object o1, Object o2) |
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{ |
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return o1 == o2 || (o1 != null && o1.equals(o2)); |
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} |
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|
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/** |
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Get the hashcode for an object. This method is safe to use |
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with null and returns 0. |
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@param o The object to get the hash code for |
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@return The hash code |
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*/ |
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public static int hashCode(Object o) |
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{ |
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return o == null ? 0 : o.hashCode(); |
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} |
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|
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/** |
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Hashcode calculation for an array of objects that doesn't |
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depend on the position in the array. Null objects are |
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ignored. |
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|
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@param objects An array of objects |
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@return The combined hash code for objects in the array |
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@see #invariantEquals(Object[], Object[]) |
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*/ |
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@SafeVarargs |
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public static <T> int hashCode(T... objects) |
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{ |
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if (objects == null) return 0; |
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int hashCode = 0; |
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for (T o : objects) |
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{ |
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if (o != null) hashCode += o.hashCode(); |
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} |
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if (hashCode == 0) hashCode = -1; |
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return hashCode; |
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} |
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|
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/** |
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Checks if two arrays contains equal elements disregarding |
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their positions in the array. Eg. [1, 2] is equal to [2, 1] |
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@param a1 The first array |
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@param a2 The second array |
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@return TRUE if both arrays contains the same elements |
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*/ |
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public static <T> boolean invariantEquals(T[] a1, T[] a2) |
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{ |
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if (a1 == a2) return true; |
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if (a1 == null || a2 == null) return false; |
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if (a1.length != a2.length) return false; |
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boolean[] matched = new boolean[a2.length]; |
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for (int i = 0; i < a1.length; ++i) |
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{ |
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T e1 = a1[i]; |
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boolean found = false; |
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for (int j = 0; j < a2.length; ++j) |
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{ |
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if (!matched[j] && equals(e1, a2[j])) |
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{ |
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matched[j] = true; |
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found = true; |
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break; |
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} |
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} |
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if (!found) return false; |
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} |
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return true; |
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} |
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|
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/** |
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Checks if two lists contains equal elements disregarding |
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their positions in the array. Eg. [1, 2] is equal to [2, 1] |
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@param l1 The first list |
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@param l2 The second list |
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@return TRUE if both list contains the same elements |
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@since 3.8 |
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*/ |
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public static boolean invariantEquals(List<?> l1, List<?> l2) |
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{ |
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if (l1 == l2) return true; |
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if (l1 == null || l2 == null) return false; |
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if (l1.size() != l2.size()) return false; |
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|
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boolean[] matched = new boolean[l2.size()]; |
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for (Object o1 : l1) |
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{ |
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boolean found = false; |
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for (int j = 0; j < l2.size(); ++j) |
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{ |
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if (!matched[j] && equals(o1, l2.get(j))) |
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{ |
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matched[j] = true; |
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found = true; |
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break; |
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} |
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} |
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if (!found) return false; |
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} |
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return true; |
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} |
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|
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|
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} |