CCM NG: CcmObjects helper class

git-svn-id: https://svn.libreccm.org/ccm/ccm_ng@6158 8810af33-2d31-482b-a856-94f89814c4df

Former-commit-id: 02ca16f7bc

ccm-core/src/main/java/org/libreccm/core/CcmObjects.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2019 LibreCCM Foundation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301  USA
+ */
+package org.libreccm.core;
+
+import java.util.Objects;
+
+/**
+ * Some helper functions
+ *
+ * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
+ */
+public final class CcmObjects {
+
+    private CcmObjects() {
+
+        // Nothing
+    }
+
+    public static int hashCodeUsingUuid(final CcmObject obj) {
+
+        if (obj == null) {
+            return 0;
+        } else {
+            return Objects.hashCode(obj.getUuid());
+        }
+
+    }
+
+    public static boolean equalsUsingUuid(final CcmObject obj1,
+                                          final CcmObject obj2) {
+
+        if (obj1 == null && obj2 == null) {
+            return true;
+        } else if (obj1 == obj2) {
+            return true;
+        } else if (obj1 == null && obj2 != null) {
+            return false;
+        } else if (obj1 != null && obj2 == null) {
+            return false;
+        } else if (obj1 != null && obj2 != null) {
+
+            final Class<?> class1 = obj1.getClass();
+            final Class<?> class2 = obj2.getClass();
+
+            if (class1.isAssignableFrom(class2)
+                    && class2.isAssignableFrom(class1)) {
+                final String uuid1 = obj1.getUuid();
+                final String uuid2 = obj2.getUuid();
+
+                return Objects.equals(uuid1, uuid2);
+            } else {
+                return false;
+            }
+        } else {
+            return false;
+        }
+    }
+
+}