Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.modeling.ui / src / org / simantics / modeling / ui / modelBrowser2 / contributions / RelationViewImager.java

diff --git a/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/modelBrowser2/contributions/RelationViewImager.java b/bundles/org.simantics.modeling.ui/src/org/simantics/modeling/ui/modelBrowser2/contributions/RelationViewImager.java
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+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 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
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.modeling.ui.modelBrowser2.contributions;\r
+\r
+import org.eclipse.jface.resource.ImageDescriptor;\r
+import org.simantics.browsing.ui.GraphExplorer;\r
+import org.simantics.browsing.ui.swt.ImagerContributor;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.exception.ServiceException;\r
+import org.simantics.modeling.ui.modelBrowser2.model.RelationViewNode;\r
+import org.simantics.operation.Layer0X;\r
+import org.simantics.ui.icons.ImageDescriptorProvider;\r
+import org.simantics.utils.datastructures.cache.ProvisionException;\r
+\r
+/**\r
+ * An imager contribution for giving {@link RelationViewNode} instances an image\r
+ * in a {@link GraphExplorer} based on the relation the :RelationView instance\r
+ * applies to.\r
+ * \r
+ * <p>\r
+ * Given\r
+ * \r
+ * <pre>\r
+ * _ : RelationView\r
+ *     L0.AppliesRelation R\r
+ * </pre>\r
+ * \r
+ * it will attempt to adapt <code>R</code> into an\r
+ * {@link ImageDescriptorProvider} and resolve the {@link ImageDescriptor} from\r
+ * there.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class RelationViewImager extends ImagerContributor<RelationViewNode> {\r
+\r
+    @Override\r
+    public ImageDescriptor getDescriptor(ReadGraph graph, RelationViewNode input) throws DatabaseException {\r
+        Resource relation = graph.getPossibleObject(input.resource, Layer0X.getInstance(graph).AppliesRelation);\r
+        if (relation == null)\r
+            return null;\r
+\r
+        ImageDescriptorProvider provider = graph.getPossibleAdapter(relation, ImageDescriptorProvider.class);\r
+        if (provider == null)\r
+            return null;\r
+\r
+        try {\r
+            return provider.get();\r
+        } catch (ProvisionException e) {\r
+            throw new ServiceException(e);\r
+        }\r
+    }\r
+\r
+}\r