Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.diagram / src / org / simantics / diagram / symbolcontribution / AdaptableTriple.java

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AdaptableTriple.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AdaptableTriple.java
new file mode 100644 (file)
index 0000000..6da676d
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AdaptableTriple.java
@@ -0,0 +1,94 @@
+/*******************************************************************************\r
+ * Copyright (c) 2013 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
+ *     Semantum Oy - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.diagram.symbolcontribution;\r
+\r
+import org.eclipse.core.runtime.IAdaptable;\r
+\r
+/**\r
+ * A basic triple structure that implements IAdaptable. It tries to adapt the\r
+ * objects to the requested class in order (first, second, third).\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ * \r
+ * @param <T1> type of first\r
+ * @param <T2> type of second\r
+ * @param <T3> type of third\r
+ */\r
+final class AdaptableTriple<T1, T2, T3> implements IAdaptable {\r
+    public final T1 first;\r
+    public final T2 second;\r
+    public final T3 third;\r
+    private final int hash;\r
+\r
+    public static <T1, T2, T3> AdaptableTriple<T1, T2, T3> make(T1 t1, T2 t2, T3 t3) {\r
+        return new AdaptableTriple<T1, T2, T3>(t1, t2, t3);\r
+    }\r
+\r
+    public AdaptableTriple(T1 first, T2 second, T3 third) {\r
+        this.first = first;\r
+        this.second = second;\r
+        this.third = third;\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
+        AdaptableTriple<?, ?, ?> other = (AdaptableTriple<?, ?, ?>) 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
+        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+">";\r
+    }\r
+\r
+    private int makeHash() {\r
+        return (first == null ? 0 : first.hashCode())\r
+                + (second == null ? 0 : second.hashCode())*31\r
+                + (third == null ? 0 : third.hashCode())*31*31;\r
+    }\r
+\r
+    private Object adapt(Object o, Class<?> clazz) {\r
+        if (clazz.isInstance(o))\r
+            return o;\r
+        if (o instanceof IAdaptable)\r
+            return ((IAdaptable) o).getAdapter(clazz);\r
+        return null;\r
+    }\r
+\r
+    @SuppressWarnings("rawtypes")\r
+    @Override\r
+    public Object getAdapter(Class adapter) {\r
+        Object o = adapt(first, adapter);\r
+        if (o == null)\r
+            o = adapt(second, adapter);\r
+        if (o == null)\r
+            o = adapt(third, adapter);\r
+        return o;\r
+    }\r
+\r
+}\r