Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.utils / src / org / simantics / utils / ObjectUtils.java

diff --git a/bundles/org.simantics.utils/src/org/simantics/utils/ObjectUtils.java b/bundles/org.simantics.utils/src/org/simantics/utils/ObjectUtils.java
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index 0000000..2eb31c6
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+++ b/bundles/org.simantics.utils/src/org/simantics/utils/ObjectUtils.java
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+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+/*\r
+ * 27.12.2005\r
+ * @Author Toni Kalajainen\r
+ */\r
+package org.simantics.utils;\r
+\r
+import java.util.Collection;\r
+import java.util.Iterator;\r
+\r
+/**\r
+ * Basic utilities for any objects.\r
+ */\r
+public class ObjectUtils {\r
+\r
+    /**\r
+     * Compares two object for equality.\r
+     * <p>\r
+     * Some times it is annoying to compare two objects if their value may be\r
+     * null.\r
+     * \r
+     * @param o1 obj1\r
+     * @param o2 obj2\r
+     * @return true if equal or both null\r
+     */\r
+    public static boolean objectEquals(Object o1, Object o2) {\r
+        if (o1 == o2)\r
+            return true;\r
+        if (o1 == null && o2 == null)\r
+            return true;\r
+        if (o1 == null || o2 == null)\r
+            return false;\r
+        return o1.equals(o2);\r
+    }\r
+\r
+    public static int hashCode(Object obj) {\r
+        return (obj == null ? 0 : obj.hashCode());\r
+    }\r
+\r
+    public static boolean equals(Collection<?> c1, Collection<?> c2) {\r
+        if (c1.size() != c2.size())\r
+            return false;\r
+        Iterator<?> i1 = c1.iterator();\r
+        Iterator<?> i2 = c2.iterator();\r
+        while (i1.hasNext()) {\r
+            if (!ObjectUtils.objectEquals(i1.next(), i2.next()))\r
+                return false;\r
+        }\r
+        return true;\r
+    }\r
+\r
+}\r