]> gerrit.simantics Code Review - simantics/platform.git/blob - bundles/org.simantics.db.common/src/org/simantics/db/common/request/ResourceRead2.java
Fixed multiple issues causing dangling references to discarded queries
[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / ResourceRead2.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 ResourceRead2<T> extends ResourceReadBase<T> {
19
20         final protected Resource resource;
21         final protected Resource resource2;
22
23     @Override
24     public int hashCode() {
25         return resource.hashCode() + 31 * resource2.hashCode();
26     }
27
28     @Override
29     public boolean equals(Object object) {
30         if (this == object)
31             return true;
32         else if (object == null)
33             return false;
34         else if (getClass() != object.getClass())
35             return false;
36         ResourceRead2<?> r = (ResourceRead2<?>)object;
37         return resource.equals(r.resource) && resource2.equals(r.resource2);
38     }
39
40     public ResourceRead2(Resource resource, Resource resource2) {
41         if(resource == null) throw new IllegalArgumentException("Null resource.");
42         if(resource2 == null) throw new IllegalArgumentException("Null resource2.");
43         this.resource = resource;
44         this.resource2 = resource2;
45     }
46     
47     @Override
48     public boolean isImmutable(ReadGraph graph) throws DatabaseException {
49         return graph.isImmutable(resource) && graph.isImmutable(resource2);
50     }
51
52     
53     @Override
54     public String toString() {
55         return getClass().getSimpleName() + "|" + resource + "|" + resource2; 
56     }
57     
58 }