]> gerrit.simantics Code Review - simantics/platform.git/blob - bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/combinators/Complement.java
Fixed multiple issues causing dangling references to discarded queries
[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / genericrelation / combinators / Complement.java
1 /*******************************************************************************
2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
3  * in Industry THTH ry.
4  * All rights reserved. This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License v1.0
6  * which accompanies this distribution, and is available at
7  * http://www.eclipse.org/legal/epl-v10.html
8  *
9  * Contributors:
10  *     VTT Technical Research Centre of Finland - initial API and implementation
11  *******************************************************************************/
12 package org.simantics.db.layer0.genericrelation.combinators;
13
14 import org.simantics.db.ReadGraph;
15 import org.simantics.db.exception.DatabaseException;
16 import org.simantics.db.layer0.adapter.GenericRelation;
17 import org.simantics.db.layer0.genericrelation.AbstractRelation;
18 import org.simantics.utils.datastructures.Pair;
19
20 /**
21  * Takes the complement of a relation;
22  */
23 public class Complement extends AbstractRelation {
24
25         GenericRelation base;
26         
27         public Complement(GenericRelation base) {
28                 this.base = base;
29         }
30
31         @Override
32         public boolean contains(ReadGraph g, Object[] tuple) throws DatabaseException {
33                 return !base.contains(g, tuple);
34         }
35         
36         @Override
37         public GenericRelation select(String bindingPattern, Object[] constants) {
38                 return new Complement(base.select(bindingPattern, constants));
39         }
40
41         @Override
42         public Pair<String, String>[] getFields() {
43                 return base.getFields();
44         }
45
46 }