add string comparer

git-svn-id: http://trooper/svn/projects/jSite/trunk@893 c3eda9e8-030b-0410-8277-bc7414b0a119

diff --git a/src/net/pterodactylus/util/beans/StringComparer.java b/src/net/pterodactylus/util/beans/StringComparer.java
new file mode 100644 (file)
index 0000000..ae58c6b
--- /dev/null
+++ b/src/net/pterodactylus/util/beans/StringComparer.java
@@ -0,0 +1,45 @@
+/*
+ * jSite2 - StringComparer.java
+ * Copyright © 2008 David Roden
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+package net.pterodactylus.util.beans;
+
+/**
+ * Compares different objects. Can be used to detect change in property values.
+ * 
+ * @author David ‘Bombe’ Roden <bombe@freenetproject.org>
+ * @version $Id$
+ */
+public class StringComparer {
+
+       /**
+        * Compares the two strings and returns whether they are equal. This method
+        * takes <code>null</code> into account as a valid value for a string.
+        * 
+        * @param first
+        *            The first string
+        * @param second
+        *            The second string
+        * @return <code>true</code> if the two strings are equal,
+        *         <code>false</code> otherwise
+        */
+       public static boolean equal(String first, String second) {
+               return ((first != null) && (second == null)) || ((first == null) && (second != null)) || ((first != null) && !first.equals(second));
+       }
+
+}