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%2Fsymbolcontribution%2FAdaptableTriple.java;fp=bundles%2Forg.simantics.diagram%2Fsrc%2Forg%2Fsimantics%2Fdiagram%2Fsymbolcontribution%2FAdaptableTriple.java;h=6da676d1c625d0685ea6c0712118a2d14341d777;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

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
index 000000000..6da676d1c
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AdaptableTriple.java
@@ -0,0 +1,94 @@
+/*******************************************************************************
+ * Copyright (c) 2013 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:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.diagram.symbolcontribution;
+
+import org.eclipse.core.runtime.IAdaptable;
+
+/**
+ * A basic triple structure that implements IAdaptable. It tries to adapt the
+ * objects to the requested class in order (first, second, third).
+ * 
+ * @author Tuukka Lehtonen
+ * 
+ * @param <T1> type of first
+ * @param <T2> type of second
+ * @param <T3> type of third
+ */
+final class AdaptableTriple<T1, T2, T3> implements IAdaptable {
+    public final T1 first;
+    public final T2 second;
+    public final T3 third;
+    private final int hash;
+
+    public static <T1, T2, T3> AdaptableTriple<T1, T2, T3> make(T1 t1, T2 t2, T3 t3) {
+        return new AdaptableTriple<T1, T2, T3>(t1, t2, t3);
+    }
+
+    public AdaptableTriple(T1 first, T2 second, T3 third) {
+        this.first = first;
+        this.second = second;
+        this.third = third;
+        this.hash = makeHash();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null)
+            return false;
+        if (!(obj.getClass().equals(this.getClass())))
+            return false;
+        AdaptableTriple<?, ?, ?> other = (AdaptableTriple<?, ?, ?>) obj;
+        if (other.first != first && (other.first == null || !other.first.equals(first)))
+            return false;
+        if (other.second != second && (other.second == null || !other.second.equals(second)))
+            return false;
+        if (other.third != third && (other.third == null || !other.third.equals(third)))
+            return false;
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return hash;
+    }
+
+    @Override
+    public String toString() {
+        return "<"+first+", "+second+", "+third+">";
+    }
+
+    private int makeHash() {
+        return (first == null ? 0 : first.hashCode())
+                + (second == null ? 0 : second.hashCode())*31
+                + (third == null ? 0 : third.hashCode())*31*31;
+    }
+
+    private Object adapt(Object o, Class<?> clazz) {
+        if (clazz.isInstance(o))
+            return o;
+        if (o instanceof IAdaptable)
+            return ((IAdaptable) o).getAdapter(clazz);
+        return null;
+    }
+
+    @SuppressWarnings("rawtypes")
+    @Override
+    public Object getAdapter(Class adapter) {
+        Object o = adapt(first, adapter);
+        if (o == null)
+            o = adapt(second, adapter);
+        if (o == null)
+            o = adapt(third, adapter);
+        return o;
+    }
+
+}