]> gerrit.simantics Code Review - simantics/platform.git/blob - bundles/org.simantics.db.common/src/org/simantics/db/common/request/ResourceRead3.java
Fixed multiple issues causing dangling references to discarded queries
[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / ResourceRead3.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.common.request;
13
14 import org.simantics.db.ReadGraph;
15 import org.simantics.db.Resource;
16 import org.simantics.db.exception.DatabaseException;
17
18 abstract public class ResourceRead3<T> extends ResourceReadBase<T> {
19
20         final protected Resource resource;
21         final protected Resource resource2;
22         final protected Resource resource3;
23
24     @Override
25     public int hashCode() {
26         return resource.hashCode() + 51 * (resource2.hashCode() + 31 * resource3.hashCode());
27     }
28
29     @Override
30     public boolean equals(Object object) {
31         if (this == object)
32             return true;
33         else if (object == null)
34             return false;
35         else if (getClass() != object.getClass())
36             return false;
37         ResourceRead3<?> r = (ResourceRead3<?>) object;
38         return resource.equals(r.resource) && resource2.equals(r.resource2) && resource3.equals(r.resource3);
39     }
40
41     public ResourceRead3(Resource r1, Resource r2, Resource r3) {
42         if(r1 == null) throw new IllegalArgumentException("Null resource1.");
43         if(r2 == null) throw new IllegalArgumentException("Null resource2.");
44         if(r3 == null) throw new IllegalArgumentException("Null resource3.");
45         this.resource = r1;
46         this.resource2 = r2;
47         this.resource3 = r3;
48     }
49
50     @Override
51     public boolean isImmutable(ReadGraph graph) throws DatabaseException {
52         return graph.isImmutable(resource) && graph.isImmutable(resource2) && graph.isImmutable(resource3);
53     }
54     
55 }