X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fcontent%2FOrderedPair.java;fp=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fcontent%2FOrderedPair.java;h=3f506ca5a886550e2db6335debaa7b59828213cc;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/content/OrderedPair.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/content/OrderedPair.java
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index 000000000..3f506ca5a
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/content/OrderedPair.java
@@ -0,0 +1,65 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.content;
+
+/**
+ * @author Tuukka Lehtonen
+ *
+ * @param <T> a comparable type
+ */
+public class OrderedPair<T extends Comparable<T>> {
+
+    private final T first;
+    private final T second;
+
+    public OrderedPair(T first, T second) {
+        assert first != null;
+        assert second != null;
+
+        int comp = first.compareTo(second);
+        if (comp < 0) {
+            this.first = first;
+            this.second = second;
+        } else {
+            this.first = second;
+            this.second = first;
+        }
+    }
+
+    public T first() {
+        return first;
+    }
+
+    public T second() {
+        return second;
+    }
+
+    @Override
+    public int hashCode() {
+        return (first.hashCode() * 31) + second.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (!(obj instanceof OrderedPair<?>))
+            return false;
+        OrderedPair<?> other = (OrderedPair<?>) obj;
+        return first.equals(other.first) && second.equals(other.second);
+    }
+
+    public static <T extends Comparable<T>> OrderedPair<T> make(T ra, T rb) {
+        return new OrderedPair<T>(ra, rb);
+    }
+
+}
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