| /* |
| * 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.sparql.algebra; |
| |
| import java.util.Map ; |
| |
| import org.apache.jena.graph.Node ; |
| import org.apache.jena.graph.Triple ; |
| import org.apache.jena.shared.PrefixMapping ; |
| import org.apache.jena.shared.impl.PrefixMappingImpl ; |
| import org.apache.jena.sparql.algebra.op.OpBGP ; |
| import org.apache.jena.sparql.algebra.op.OpFilter ; |
| import org.apache.jena.sparql.algebra.op.OpGraph ; |
| import org.apache.jena.sparql.algebra.op.OpQuadPattern ; |
| import org.apache.jena.sparql.core.BasicPattern ; |
| |
| public class OpPrefixesUsed |
| { |
| static public PrefixMapping used(Op op, PrefixMapping pmap) |
| { |
| PrefixMapping pmap2 = new PrefixMappingImpl() ; |
| PrefixFinder finder = new PrefixFinder(pmap2, pmap.getNsPrefixMap()) ; |
| OpWalker.walk(op, finder) ; |
| return pmap2 ; |
| } |
| |
| |
| static class PrefixFinder extends OpVisitorBase |
| { |
| Map<String, String> pmap ; |
| PrefixMapping usedPMap ; |
| |
| public PrefixFinder(PrefixMapping pmap2, Map<String, String> pmap) |
| { |
| this.pmap = pmap ; |
| this.usedPMap = pmap2 ; |
| } |
| |
| @Override |
| public void visit(OpGraph opGraph) |
| { |
| node(opGraph.getNode()) ; |
| } |
| |
| @Override |
| public void visit(OpQuadPattern quadPattern) |
| { |
| node(quadPattern.getGraphNode()) ; |
| visit(quadPattern.getBasicPattern()) ; |
| } |
| |
| @Override |
| public void visit(OpBGP opBGP) |
| { |
| BasicPattern p = opBGP.getPattern() ; |
| visit(opBGP.getPattern()) ; |
| } |
| |
| private void visit(BasicPattern pattern) |
| { |
| for ( Triple t : pattern ) |
| { |
| node(t.getSubject()) ; |
| node(t.getPredicate()) ; |
| node(t.getObject()) ; |
| } |
| } |
| |
| @Override |
| public void visit(OpFilter opFilter) |
| { |
| // Do more |
| } |
| |
| private void node(Node n) |
| { |
| if ( ! n.isURI() ) return ; |
| String uri = n.getURI() ; |
| |
| if ( usedPMap.shortForm(uri) != uri ) |
| return ; |
| |
| for ( Map.Entry<String, String> e : pmap.entrySet() ) |
| { |
| String k = e.getKey(); |
| String v = e.getValue(); |
| |
| if ( uri.startsWith( v ) ) |
| { |
| usedPMap.setNsPrefix( k, v ); |
| return; |
| } |
| } |
| } |
| } |
| } |