Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.layer0.utils / src / org / simantics / layer0 / utils / binaryPredicates / Relation.java

diff --git a/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/binaryPredicates/Relation.java b/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/binaryPredicates/Relation.java
new file mode 100644 (file)
index 0000000..d9fdca7
--- /dev/null
+++ b/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/binaryPredicates/Relation.java
@@ -0,0 +1,122 @@
+/*******************************************************************************\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.layer0.utils.binaryPredicates;\r
+\r
+import java.util.Collection;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.common.utils.NameUtils;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.utils.datastructures.Pair;\r
+\r
+public class Relation extends BinaryPredicate {\r
+\r
+       Resource relation;\r
+       \r
+       public Relation(Resource relation) {\r
+               this.relation = relation;\r
+       }\r
+\r
+       @Override\r
+       public Collection<Resource> getObjects(ReadGraph g, Resource subject) throws DatabaseException {\r
+               return g.getObjects(subject, relation);\r
+       }\r
+\r
+       @Override\r
+       public Collection<Pair<Resource, Resource>> getStatements(ReadGraph g) {\r
+               throw new UnsupportedOperationException();\r
+       }\r
+\r
+       @Override\r
+       public Collection<Resource> getSubjects(ReadGraph g, Resource object) throws DatabaseException {\r
+               return g.getObjects(object, g.getInverse(relation));\r
+       }\r
+\r
+       @Override\r
+       public boolean has(ReadGraph g, Resource subject, Resource object) throws DatabaseException {\r
+               return g.hasStatement(subject, relation, object);\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsGetObjects() {\r
+               return true;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsGetStatements() {\r
+               return false;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsGetSubjects() {\r
+               return true;\r
+       }\r
+\r
+       @Override\r
+       public void add(WriteGraph g, Resource subject, Resource object) throws DatabaseException {\r
+               g.claim(subject, relation, object);\r
+       }\r
+\r
+       @Override\r
+       public void remove(WriteGraph g, Resource subject, Resource object) throws DatabaseException {\r
+               g.denyStatement(subject, relation, object);\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsAdditions() {\r
+               return true;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsRemovals() {\r
+               return false;\r
+       }\r
+\r
+       @Override\r
+       public int hashCode() {\r
+               final int prime = 31;\r
+               int result = 1;\r
+               result = prime * result\r
+                               + ((relation == null) ? 0 : relation.hashCode());\r
+               return result;\r
+       }\r
+\r
+       @Override\r
+       public boolean equals(Object obj) {\r
+               if (this == obj)\r
+                       return true;\r
+               if (obj == null)\r
+                       return false;\r
+               if (getClass() != obj.getClass())\r
+                       return false;\r
+               Relation other = (Relation) obj;\r
+               if (relation == null) {\r
+                       if (other.relation != null)\r
+                               return false;\r
+               } else if (!relation.equals(other.relation))\r
+                       return false;\r
+               return true;\r
+       }\r
+       \r
+       @Override\r
+       public IBinaryPredicate inverse(ReadGraph g) throws DatabaseException {\r
+               return new Relation(g.getInverse(relation));\r
+       }\r
+       \r
+       @Override\r
+       public String toString(ReadGraph g) throws DatabaseException {\r
+               return NameUtils.getSafeName(g, relation);\r
+       }\r
+       \r
+}\r