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possibleObjectForType utility
[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / variable / VariableRepository.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.variable;
13
14 import java.util.HashMap;
15 import java.util.Map;
16
17 import org.simantics.db.ReadGraph;
18 import org.simantics.db.exception.DatabaseException;
19 import org.simantics.db.layer0.exception.MissingVariableException;
20
21 final public class VariableRepository {
22
23         final private static HashMap<String, Variable> repository = new HashMap<String, Variable>(); 
24         
25         public static synchronized void register(String uri, Variable variable) {
26                 repository.put(uri, variable);
27         }
28
29         public static synchronized void unregister(String uri) {
30                 repository.remove(uri);
31         }
32
33         public static synchronized Variable get(ReadGraph graph, String uri) throws DatabaseException {
34                 for(Map.Entry<String, Variable> e : repository.entrySet()) {
35                         if(uri.startsWith(e.getKey())) {
36                                 return e.getValue().browse(graph, uri.substring(e.getKey().length()));
37                         }
38                 }
39                 throw new MissingVariableException(uri, null);
40         }
41
42         public static void clear() {
43             repository.clear();
44         }
45     
46 }