Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.diagram / src / org / simantics / diagram / adapter / CanvasAdapterFactory.java

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/CanvasAdapterFactory.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/CanvasAdapterFactory.java
new file mode 100644 (file)
index 0000000..317966b
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/adapter/CanvasAdapterFactory.java
@@ -0,0 +1,54 @@
+/*******************************************************************************\r
+ * Copyright (c) 2011 Association for Decentralized Information Management in\r
+ * 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
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.diagram.adapter;\r
+\r
+import java.util.concurrent.atomic.AtomicBoolean;\r
+\r
+import org.eclipse.core.runtime.IAdaptable;\r
+import org.eclipse.core.runtime.IAdapterFactory;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class CanvasAdapterFactory implements IAdapterFactory {\r
+\r
+    /**\r
+     * Hack for preventing eternal {@link #getAdapter(Object, Class)} recursion\r
+     */\r
+    AtomicBoolean adapting = new AtomicBoolean(false);\r
+\r
+    @SuppressWarnings("rawtypes")\r
+    @Override\r
+    public Object getAdapter(Object adaptableObject, Class adapterType) {\r
+        if (!adapting.compareAndSet(false, true)) {\r
+            return null;\r
+        }\r
+        try {\r
+            if (ICanvasContext.class.equals(adapterType)) {\r
+                if (adaptableObject instanceof IAdaptable) {\r
+                    return ((IAdaptable) adaptableObject).getAdapter(adapterType);\r
+                }\r
+            }\r
+            return null;\r
+        } finally {\r
+            adapting.set(false);\r
+        }\r
+    }\r
+\r
+    @SuppressWarnings("rawtypes")\r
+    @Override\r
+    public Class[] getAdapterList() {\r
+        return new Class[] { ICanvasContext.class };\r
+    }\r
+\r
+}\r