| /* |
| * 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.core; |
| |
| import java.util.ArrayList ; |
| import java.util.Collection ; |
| import java.util.Iterator ; |
| import java.util.List ; |
| |
| import org.apache.jena.query.Dataset ; |
| import org.apache.jena.query.Query ; |
| import org.apache.jena.sparql.ARQConstants ; |
| import org.apache.jena.sparql.ARQException ; |
| import org.apache.jena.sparql.util.Context ; |
| import org.apache.jena.sparql.util.DatasetUtils ; |
| |
| // TODO Integrate this further |
| // use in FROM/FROM NAMED and change Query class. |
| // use in DatasetUtils |
| // use in tests |
| |
| public class DatasetDescription |
| { |
| private List<String> defaultGraphURIs = new ArrayList<>() ; |
| private List<String> namedGraphURIs = new ArrayList<>() ; |
| |
| public static DatasetDescription create(List<String> defaultGraphURIs , List<String> namedGraphURIs) |
| { |
| return new DatasetDescription(defaultGraphURIs, namedGraphURIs) ; |
| } |
| |
| /** Create a dataset description, given a query. |
| * If the query does not have a dataset description, return null. |
| */ |
| public static DatasetDescription create(Query query) { return create(query, null) ; } |
| |
| /** Create a dataset description, given a context. |
| * If the context does not have a dataset description, return null. |
| * The context uses the key {@link ARQConstants#sysDatasetDescription}. |
| */ |
| public static DatasetDescription create(Context context) { return create(null, context) ; } |
| |
| /** Create a dataset description, given a query and context. |
| * The context overrides the query FROM/FROM NAMED. |
| * If neither the context nor query has a dataset description, return null. |
| * The context uses the key {@link ARQConstants#sysDatasetDescription}. |
| */ |
| public static DatasetDescription create(Query query, Context context) |
| { |
| if ( context != null && context.isDefined(ARQConstants.sysDatasetDescription) ) |
| { |
| try { |
| return (DatasetDescription)context.get(ARQConstants.sysDatasetDescription) ; |
| } catch (ClassCastException ex) |
| { |
| throw new ARQException("Unexpected type (expected DatasetDescription): "+ex.getMessage()) ; |
| } |
| } |
| |
| if ( query != null && query.hasDatasetDescription() ) |
| return query.getDatasetDescription() ; |
| |
| return null ; |
| } |
| |
| public DatasetDescription() {} |
| public DatasetDescription(List<String> defaultGraphURIs , List<String> namedGraphURIs) |
| { |
| this() ; |
| addAllDefaultGraphURIs(defaultGraphURIs) ; |
| addAllNamedGraphURIs(namedGraphURIs) ; |
| } |
| |
| public boolean isEmpty() { return defaultGraphURIs.isEmpty() && namedGraphURIs.isEmpty() ; } |
| |
| public void addDefaultGraphURI(String uri) { defaultGraphURIs.add(uri) ; } |
| public void addAllDefaultGraphURIs(Collection<String> uris) { defaultGraphURIs.addAll(uris) ; } |
| |
| public void addNamedGraphURI(String uri) { namedGraphURIs.add(uri) ; } |
| public void addAllNamedGraphURIs(Collection<String> uris) { namedGraphURIs.addAll(uris) ; } |
| |
| public List<String> getDefaultGraphURIs() { return defaultGraphURIs ; } |
| public List<String> getNamedGraphURIs() { return namedGraphURIs ; } |
| |
| public Iterator<String> eachDefaultGraphURI() { return defaultGraphURIs.iterator() ; } |
| public Iterator<String> eachNamedGraphURI() { return namedGraphURIs.iterator() ; } |
| |
| /** Create a dataset from the description - reads URLs into an in-memory dataset */ |
| public Dataset createDataset() { return DatasetUtils.createDataset(this) ; } |
| |
| /** Create a DatasetGraph from the description - reads URLs into an in-memory DatasetGraph */ |
| public DatasetGraph createDatasetGraph() { return DatasetUtils.createDatasetGraph(this) ; } |
| |
| @Override |
| public String toString() { |
| return "DatasetDescription : "+defaultGraphURIs+" : "+namedGraphURIs; |
| } |
| } |