X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.browsing.ui.model%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fmodel%2Fchildren%2FRelationStatementRule.java;fp=bundles%2Forg.simantics.browsing.ui.model%2Fsrc%2Forg%2Fsimantics%2Fbrowsing%2Fui%2Fmodel%2Fchildren%2FRelationStatementRule.java;h=82b92055d7ac72532d13129d998018da47e9b473;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/RelationStatementRule.java b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/RelationStatementRule.java
new file mode 100644
index 000000000..82b92055d
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.model/src/org/simantics/browsing/ui/model/children/RelationStatementRule.java
@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * Copyright (c) 2010, 2011 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.model.children;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+
+import org.simantics.browsing.ui.model.tests.Test;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Statement;
+import org.simantics.db.exception.DatabaseException;
+
+/**
+ * A child rule that says that there is exactly one child node whose content 
+ * is equal to the content of the parent.
+ * @author Hannu Niemistö
+ */
+public class RelationStatementRule implements ChildRule {
+
+    Resource relation;
+    
+    public RelationStatementRule(Resource relation, Test test) {
+        this.relation = relation;
+    }
+    
+    @Override
+    public Collection<?> getChildren(ReadGraph graph, Object parent) throws DatabaseException {
+    	ArrayList<Statement> result = new ArrayList<Statement>();
+    	for(Resource property : graph.getPredicates((Resource)parent)) {
+    		if(graph.isSubrelationOf(property, relation)) {
+    			result.addAll(graph.getStatements((Resource)parent, property));
+    		}
+    	}
+        return result;
+    }
+
+    @Override
+    public Collection<?> getParents(ReadGraph graph, Object child)
+            throws DatabaseException {
+        return Collections.emptyList();
+    }
+    
+    @Override
+    public boolean isCompatible(Class<?> contentType) {
+        return contentType.equals(Resource.class);
+    }
+}