-/*******************************************************************************\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.layer0.genericrelation.combinators;\r
-\r
-import java.util.ArrayList;\r
-import java.util.Collection;\r
-import java.util.List;\r
-\r
-import org.simantics.db.ReadGraph;\r
-import org.simantics.db.exception.DatabaseException;\r
-import org.simantics.db.layer0.adapter.GenericRelation;\r
-import org.simantics.db.layer0.genericrelation.AbstractRelation;\r
-import org.simantics.utils.datastructures.Pair;\r
-\r
-/**\r
- * Takes the intersection of multiple relations.\r
- */\r
-public class Intersection extends AbstractRelation {\r
-\r
- GenericRelation realizable = null;\r
- Collection<GenericRelation> constraints;\r
- \r
- public Intersection(Collection<GenericRelation> relations) {\r
- for(GenericRelation relation : relations)\r
- if(realizable == null && relation.isRealizable()) {\r
- realizable = relation;\r
- }\r
- else\r
- constraints.add(relation);\r
- }\r
- \r
- public Intersection(GenericRelation realizable, Collection<GenericRelation> constraints) {\r
- assert(realizable.isRealizable());\r
- this.realizable = realizable;\r
- this.constraints = constraints;\r
- }\r
-\r
- @Override\r
- public boolean contains(ReadGraph g, Object[] tuple) throws DatabaseException {\r
- if(!realizable.contains(g, tuple))\r
- return false;\r
- for(GenericRelation relation : constraints)\r
- if(!relation.contains(g, tuple))\r
- return false;\r
- return true;\r
- }\r
-\r
- @Override\r
- public boolean isRealizable() {\r
- return realizable != null;\r
- }\r
-\r
- @Override\r
- public List<Object[]> realize(ReadGraph g) throws DatabaseException {\r
- ArrayList<Object[]> result = new ArrayList<Object[]>();\r
- loop:\r
- for(Object[] tuple : realizable.realize(g)) {\r
- for(GenericRelation constraint : constraints)\r
- if(!constraint.contains(g, tuple))\r
- continue loop;\r
- result.add(tuple);\r
- }\r
- return result;\r
- } \r
-\r
- // TODO optimize select\r
- \r
- @Override\r
- public GenericRelation selectByRelation(String bindingPattern,\r
- GenericRelation constraint) {\r
- if(realizable != null)\r
- return new Intersection(realizable.selectByRelation(bindingPattern, constraint),\r
- constraints);\r
- else\r
- return super.selectByRelation(bindingPattern, constraint);\r
- }\r
- \r
- @Override\r
- public Pair<String, String>[] getFields() {\r
- if(realizable != null)\r
- return realizable.getFields();\r
- for(GenericRelation relation : constraints)\r
- return relation.getFields();\r
- return null;\r
- }\r
-\r
-}\r
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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.db.layer0.genericrelation.combinators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.adapter.GenericRelation;
+import org.simantics.db.layer0.genericrelation.AbstractRelation;
+import org.simantics.utils.datastructures.Pair;
+
+/**
+ * Takes the intersection of multiple relations.
+ */
+public class Intersection extends AbstractRelation {
+
+ GenericRelation realizable = null;
+ Collection<GenericRelation> constraints;
+
+ public Intersection(Collection<GenericRelation> relations) {
+ for(GenericRelation relation : relations)
+ if(realizable == null && relation.isRealizable()) {
+ realizable = relation;
+ }
+ else
+ constraints.add(relation);
+ }
+
+ public Intersection(GenericRelation realizable, Collection<GenericRelation> constraints) {
+ assert(realizable.isRealizable());
+ this.realizable = realizable;
+ this.constraints = constraints;
+ }
+
+ @Override
+ public boolean contains(ReadGraph g, Object[] tuple) throws DatabaseException {
+ if(!realizable.contains(g, tuple))
+ return false;
+ for(GenericRelation relation : constraints)
+ if(!relation.contains(g, tuple))
+ return false;
+ return true;
+ }
+
+ @Override
+ public boolean isRealizable() {
+ return realizable != null;
+ }
+
+ @Override
+ public List<Object[]> realize(ReadGraph g) throws DatabaseException {
+ ArrayList<Object[]> result = new ArrayList<Object[]>();
+ loop:
+ for(Object[] tuple : realizable.realize(g)) {
+ for(GenericRelation constraint : constraints)
+ if(!constraint.contains(g, tuple))
+ continue loop;
+ result.add(tuple);
+ }
+ return result;
+ }
+
+ // TODO optimize select
+
+ @Override
+ public GenericRelation selectByRelation(String bindingPattern,
+ GenericRelation constraint) {
+ if(realizable != null)
+ return new Intersection(realizable.selectByRelation(bindingPattern, constraint),
+ constraints);
+ else
+ return super.selectByRelation(bindingPattern, constraint);
+ }
+
+ @Override
+ public Pair<String, String>[] getFields() {
+ if(realizable != null)
+ return realizable.getFields();
+ for(GenericRelation relation : constraints)
+ return relation.getFields();
+ return null;
+ }
+
+}
Code Review / simantics / platform.git / blobdiff