/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.query.spatial;
import org.apache.jena.graph.Node ;
import org.apache.jena.graph.NodeFactory ;
public class SpatialQueryFuncs {
/** Create a string to put in a Lucene/Solr index for the subject node */
public static String subjectToString(Node s) {
if ( s == null )
throw new IllegalArgumentException("Subject node can not be null") ;
if ( ! (s.isURI() || s.isBlank() ) )
throw new SpatialIndexException("Found a subject that is not a URI nor a blank node: "+s) ;
return nodeToString(s) ;
}
/** Create a string to put in a Lucene/Solr index for a graph node */
public static String graphNodeToString(Node g) {
if ( g == null )
return null ;
if ( ! (g.isURI() || g.isBlank() ) )
throw new SpatialIndexException("Found a graph label that is not a URI nor a blank node: "+g) ;
return nodeToString(g) ;
}
private static String nodeToString(Node n) {
return (n.isURI() ) ? n.getURI() : "_:" + n.getBlankNodeLabel() ;
}
/** Recover a Node from a stored Lucene/Solr string */
public static Node stringToNode(String v) {
if ( v.startsWith("_:") ) {
v = v.substring("_:".length()) ;
return NodeFactory.createBlankNode(v) ;
}
else
return NodeFactory.createURI(v) ;
}
}