X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.browsing.ui.swt%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fswt%2Finputs%2FDatum.java;fp=bundles%2Forg.simantics.browsing.ui.swt%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fswt%2Finputs%2FDatum.java;h=6a554f4ac0f328f6f0d707236449fd0011eb377d;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/inputs/Datum.java b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/inputs/Datum.java
new file mode 100644
index 000000000..6a554f4ac
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.swt/src/org/simantics/browsing/ui/swt/inputs/Datum.java
@@ -0,0 +1,68 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2012 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.browsing.ui.swt.inputs;
+
+import org.eclipse.core.runtime.IAdaptable;
+
+/**
+ * An equals-comparable and adaptable container for a single datum. The datum
+ * may be <code>null</code>. Adaptability is provided through {@link IAdaptable}
+ * .
+ * 
+ * @author Tuukka Lehtonen
+ * 
+ * @param <T> the type of the datum
+ */
+public class Datum<T> implements IAdaptable {
+
+    protected final T datum;
+
+    public Datum(T datum) {
+        this.datum = datum;
+    }
+
+    public T getDatum() {
+        return datum;
+    }
+
+    @SuppressWarnings({ "unchecked", "rawtypes" })
+    @Override
+    public Object getAdapter(Class adapter) {
+        if (datum != null) {
+            if (adapter.isAssignableFrom(datum.getClass()))
+                return datum;
+            if (datum instanceof IAdaptable)
+                return ((IAdaptable) datum).getAdapter(adapter);
+        }
+        return null;
+    }
+
+    @Override
+    public int hashCode() {
+        return datum != null ? datum.hashCode() : 0;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Datum<?> other = (Datum<?>) obj;
+        if (datum == null)
+            return datum == other.datum;
+        return datum.equals(other.datum);
+    }
+
+}
\ No newline at end of file