1 files changed, 67 insertions, 0 deletions
diff --git a/src/proguard/util/ObjectUtil.java b/src/proguard/util/ObjectUtil.java
new file mode 100644
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+++ b/src/proguard/util/ObjectUtil.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * 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 proguard.util;
+
+/**
+ * This class contains utility methods operating on objects.
+ */
+public class ObjectUtil
+{
+    /**
+     * Returns whether the given objects are the same.
+     * @param object1 the first object, may be null.
+     * @param object2 the second object, may be null.
+     * @return whether the objects are the same.
+     */
+    public static boolean equal(Object object1, Object object2)
+    {
+        return object1 == null ?
+            object2 == null :
+            object1.equals(object2);
+    }
+
+
+    /**
+     * Returns the hash code of the given object, or 0 if it is null.
+     * @param object the object, may be null.
+     * @return the hash code.
+     */
+    public static int hashCode(Object object)
+    {
+        return object == null ? 0 : object.hashCode();
+    }
+
+
+    /**
+     * Returns a comparison of the two given objects.
+     * @param object1 the first object, may be null.
+     * @param object2 the second object, may be null.
+     * @return -1, 0, or 1.
+     * @see Comparable#compareTo(Object)
+     */
+    public static int compare(Comparable object1, Comparable object2)
+    {
+        return object1 == null ?
+            object2 == null ? 0 : -1 :
+            object2 == null ? 1 : object1.compareTo(object2);
+    }
+}