Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / uri / ResourceToPossibleURI.java

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/uri/ResourceToPossibleURI.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/uri/ResourceToPossibleURI.java
new file mode 100644 (file)
index 0000000..a8de839
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/uri/ResourceToPossibleURI.java
@@ -0,0 +1,49 @@
+/*******************************************************************************\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.db.common.uri;\r
+\r
+import org.simantics.databoard.Bindings;\r
+import org.simantics.databoard.util.URIStringUtils;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.common.request.ResourceRead;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+\r
+/**\r
+ * Tries to retrieve URIs for specified resources. Returns <code>null</code> if\r
+ * URI is undefined. This query follows the semantics of\r
+ * {@link ReadGraph#getPossibleURI(Resource)}.\r
+ * \r
+ * @author Antti Villberg\r
+ */\r
+public class ResourceToPossibleURI extends ResourceRead<String> {\r
+\r
+    public ResourceToPossibleURI(Resource resource) {\r
+        super(resource);\r
+    }\r
+\r
+    @Override\r
+    public String perform(ReadGraph g) throws DatabaseException {\r
+       if(g.getRootLibrary().equals(resource)) return "http:/";\r
+       Layer0 L0 = Layer0.getInstance(g);\r
+       String name = g.getPossibleRelatedValue(resource, L0.HasName, Bindings.STRING);\r
+       if(name == null) return null;\r
+        String escapedName = URIStringUtils.escape((String) name);\r
+        Resource parent = g.getPossibleObject(resource, L0.PartOf);\r
+        if(parent == null) return null;\r
+        String parentURI = g.syncRequest(new ResourceToPossibleURI(parent));\r
+        if(parentURI == null) return null;\r
+        return parentURI + "/" + escapedName;\r
+    }\r
+\r
+}\r