VariableOrResource SCL type

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / variable / VariableOrResource.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableOrResource.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableOrResource.java
new file mode 100644 (file)
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+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableOrResource.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2019 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.db.layer0.variable;
+
+import org.simantics.db.Resource;
+
+/**
+ * An interface to match the VariableOrResource SCL data type
+ * which represents either a Resource or a Variable. Allows
+ * defining SCL classes with either of the two as a input.
+ *
+ * @author Antti Villberg
+ * @since 1.40.0
+ */
+public interface VariableOrResource {
+
+    public static VariableOrResource make(Resource value) {
+        return new ResourceX(value);
+    }
+    
+    public static VariableOrResource make(Variable value) {
+        return new VariableX(value);
+    }
+
+    public static VariableOrResource make(Object value) {
+        if(value instanceof Resource)
+            return make((Resource)value);
+        if(value instanceof Variable)
+            return make((Variable)value);
+        throw new IllegalArgumentException("VariableOrResource acccepts only Variable or Resource, got " + value + " with class " + value.getClass().getName());
+    }
+
+}