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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 org.simantics.db.ReadGraph;
15 import org.simantics.db.Resource;
16 import org.simantics.db.exception.DatabaseException;
17
18 public final class VariablesImpl {
19
20         public final static int nextSeparator(String path, int startPosition) {
21                 int len = path.length();
22                 for (int i = startPosition; i < len; ++i) {
23                         char c = path.charAt(i);
24                         if (c == '/' || c == '#')
25                                 return i;
26                 }
27                 return -1;
28         }
29         
30     public final static Resource getFirst(ReadGraph graph, Resource type, String path, int startPosition) throws DatabaseException {
31
32         int position = nextSeparator(path, startPosition);
33         if (position == -1) {
34             Resource r = graph.getResource(path);
35             if (graph.isInstanceOf(r, type))
36                 return r;
37             return null;
38         }
39         
40         Resource r = graph.getResource(path.substring(0, position));
41         if (graph.isInstanceOf(r, type)) {
42             return r;
43         } else {
44             return getFirst(graph, type, path, position + 1);
45         }
46
47     }
48
49 }