Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Quad.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Quad.java
new file mode 100644 (file)
index 0000000..76f2d62
--- /dev/null
+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/Quad.java
@@ -0,0 +1,73 @@
+/*******************************************************************************\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
+package org.simantics.utils.datastructures;\r
+\r
+/**\r
+ * A generic Quad (4-tuple) structure for containing four object instances of\r
+ * chosen types.\r
+ * \r
+ * @param <T1> type of first element\r
+ * @param <T2> type of second element\r
+ * @param <T3> type of third element\r
+ * @param <T4> type of fourth element\r
+ */\r
+public final class Quad<T1, T2, T3, T4> {\r
+    public final T1 first;\r
+    public final T2 second;\r
+    public final T3 third;\r
+    public final T4 fourth;\r
+    private final int hash;\r
+\r
+    public static <T1, T2, T3, T4> Quad<T1, T2, T3, T4> make(T1 t1, T2 t2, T3 t3, T4 t4) {\r
+        return new Quad<T1, T2, T3, T4>(t1, t2, t3, t4);\r
+    }\r
+\r
+    public Quad(T1 first, T2 second, T3 third, T4 fourth) {\r
+        this.first = first;\r
+        this.second = second;\r
+        this.third = third;\r
+        this.fourth = fourth;\r
+        this.hash = makeHash();\r
+    }\r
+    \r
+    @Override\r
+    public boolean equals(Object obj) {\r
+        if (obj == null)\r
+            return false;\r
+        if (!(obj.getClass().equals(this.getClass())))\r
+            return false;\r
+        Quad<?, ?, ?, ?> other = (Quad<?, ?, ?, ?>) obj;\r
+        if (other.first != first && (other.first == null || !other.first.equals(first)))\r
+            return false;\r
+        if (other.second != second && (other.second == null || !other.second.equals(second)))\r
+            return false;\r
+        if (other.third != third && (other.third == null || !other.third.equals(third)))\r
+            return false;\r
+        if (other.fourth != fourth && (other.fourth == null || !other.fourth.equals(fourth)))\r
+            return false;\r
+        return true;\r
+    }\r
+    \r
+    @Override\r
+    public int hashCode() {\r
+        return hash;\r
+    }\r
+    \r
+    @Override\r
+    public String toString() {\r
+        return "<"+first+", "+second+", "+third+", "+fourth+">";\r
+    }\r
+    \r
+    private int makeHash() {\r
+        return (first == null ? 0 : first.hashCode()) + (second == null ? 0 : second.hashCode())*31 + (third == null ? 0 : third.hashCode())*41+ (fourth == null ? 0 : fourth.hashCode())*71;\r
+    }\r
+}\r