1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.db.common.uri;
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14 import org.simantics.databoard.Bindings;
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15 import org.simantics.databoard.util.URIStringUtils;
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16 import org.simantics.db.ReadGraph;
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17 import org.simantics.db.Resource;
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18 import org.simantics.db.common.request.ResourceRead;
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19 import org.simantics.db.exception.DatabaseException;
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20 import org.simantics.layer0.Layer0;
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23 * Tries to retrieve URIs for specified resources. Returns <code>null</code> if
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24 * URI is undefined. This query follows the semantics of
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25 * {@link ReadGraph#getPossibleURI(Resource)}.
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27 * @author Antti Villberg
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29 public class ResourceToPossibleURI extends ResourceRead<String> {
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31 public ResourceToPossibleURI(Resource resource) {
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36 public String perform(ReadGraph g) throws DatabaseException {
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37 if(g.getRootLibrary().equals(resource)) return "http:/";
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38 Layer0 L0 = Layer0.getInstance(g);
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39 String name = g.getPossibleRelatedValue(resource, L0.HasName, Bindings.STRING);
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40 if(name == null) return null;
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41 String escapedName = URIStringUtils.escape((String) name);
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42 Resource parent = g.getPossibleObject(resource, L0.PartOf);
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43 if(parent == null) return null;
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44 String parentURI = g.syncRequest(new ResourceToPossibleURI(parent));
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45 if(parentURI == null) return null;
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46 return parentURI + "/" + escapedName;
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