| /* |
| * 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.assembler; |
| |
| import java.util.*; |
| |
| import org.apache.jena.graph.Graph ; |
| import org.apache.jena.graph.compose.MultiUnion ; |
| import org.apache.jena.rdf.model.* ; |
| import org.apache.jena.util.FileManager ; |
| import org.apache.jena.vocabulary.* ; |
| |
| public class ImportManager |
| { |
| public ImportManager() |
| {} |
| |
| /** |
| A shared instance of ImportManage, used as a default by several other |
| assembler methods. |
| */ |
| public final static ImportManager instance = new ImportManager(); |
| |
| /** |
| The cache of models already read by this manager. |
| */ |
| protected Map<String, Graph> cache = new HashMap<>(); |
| |
| /** |
| Clear this ImportManager's cache. |
| */ |
| public void clear() |
| { cache.clear(); } |
| |
| /** |
| Answer <code>model</code> if it has no imports, or a union model with |
| <code>model</code> as its base and its imported models as the other |
| components. The default file manager is used to load the models. |
| */ |
| public Model withImports( Model model ) |
| { return withImports( FileManager.getInternal(), model ); } |
| |
| /** |
| Answer <code>model</code> if it has no imports, or a union model with |
| <code>model</code> as its base and its imported models as the other |
| components. The file manager <code>fm</code> is used to load the |
| imported models. |
| */ |
| public Model withImports( FileManager fm, Model model ) |
| { return withImports( fm, model, new HashSet<String>() ); } |
| |
| private Model withImports( FileManager fm, Model model, Set<String> loading ) |
| { |
| StmtIterator oit = model.listStatements( null, OWL.imports, (RDFNode) null ); |
| StmtIterator jit = model.listStatements( null, JA.imports, (RDFNode) null ); |
| if (oit.hasNext() || jit.hasNext()) |
| { |
| MultiUnion g = new MultiUnion( new Graph[] { model.getGraph() } ); |
| addImportedGraphs( fm, loading, oit, g ); |
| addImportedGraphs( fm, loading, jit, g ); |
| return ModelFactory.createModelForGraph( g ); |
| } |
| else |
| return model; |
| } |
| |
| private void addImportedGraphs( FileManager fm, Set<String> loading, StmtIterator oit, MultiUnion g ) |
| { |
| while (oit.hasNext()) |
| { |
| String path = getObjectURI( oit.nextStatement() ); |
| if (loading.add( path )) g.addGraph( graphFor( fm, loading, path ) ); |
| } |
| } |
| |
| private String getObjectURI( Statement s ) |
| { |
| RDFNode ob = s.getObject(); |
| if (ob.isLiteral()) return AssemblerHelp.getString( s ); |
| if (ob.isAnon()) throw new BadObjectException( s ); |
| return ((Resource) ob).getURI(); |
| } |
| |
| protected Graph graphFor( FileManager fm, Set<String> loading, String path ) |
| { |
| Graph already = cache.get( path ); |
| if (already == null) |
| { |
| Graph result = withImports( fm, fm.loadModelInternal( path ), loading ).getGraph(); |
| cache.put( path, result ); |
| return result; |
| } |
| else |
| return already; |
| } |
| } |