| /* |
| * 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.Iterator; |
| |
| import org.apache.jena.atlas.lib.Sync; |
| import org.apache.jena.graph.Graph; |
| import org.apache.jena.graph.Node; |
| import org.apache.jena.query.ReadWrite; |
| import org.apache.jena.query.TxnType; |
| import org.apache.jena.shared.Lock; |
| import org.apache.jena.sparql.SystemARQ; |
| import org.apache.jena.sparql.util.Context; |
| import org.apache.jena.system.Txn; |
| |
| public class DatasetGraphWrapper implements DatasetGraph, Sync |
| { |
| // The wrapped DatasetGraph but all calls go via get() so this can be null. |
| private final DatasetGraph dsg; |
| private Context context; |
| |
| /** Return the DatasetGraph being wrapped. */ |
| public final DatasetGraph getWrapped() { |
| return get(); |
| } |
| |
| /** Recursively unwrap a {@link DatasetGraphWrapper}. |
| * |
| * @return the first found {@link DatasetGraph} that is not an instance of {@link DatasetGraphWrapper} |
| */ |
| public final DatasetGraph getBase() { |
| DatasetGraph dsgw = dsg; |
| while (dsgw instanceof DatasetGraphWrapper) { |
| dsgw = ((DatasetGraphWrapper)dsg).getWrapped(); |
| } |
| return dsgw; |
| } |
| |
| /** Recursively unwrap a {@link DatasetGraphWrapper}, stopping at a {@link DatasetGraphWrapper} |
| * that indicate it is "view changing", ie shows quads to the base dataset graph. |
| * |
| * @return the first found {@link DatasetGraph} that is not an instance of {@link DatasetGraphWrapper} |
| */ |
| public final DatasetGraph getBaseForQuery() { |
| DatasetGraph dsgw = dsg; |
| while (dsgw instanceof DatasetGraphWrapper) { |
| if ( dsgw instanceof DatasetGraphWrapperView ) |
| break; |
| dsgw = ((DatasetGraphWrapper)dsg).getWrapped(); |
| } |
| return dsgw; |
| } |
| |
| /** The dataset to use for redirection - can be overridden. |
| * It is also guaranteed that this is called only once per |
| * delegated call. Changes to the wrapped object can be |
| * made based on that contract. |
| */ |
| protected DatasetGraph get() { return dsg; } |
| |
| protected Context getCxt() { return context; } |
| |
| /** For operations that only read the DatasetGraph. */ |
| protected DatasetGraph getR() { return get(); } |
| |
| /** For operations that write the DatasetGraph. */ |
| protected DatasetGraph getW() { return get(); } |
| |
| /** For operations that get a handle on a graph. */ |
| protected DatasetGraph getG() { return get(); } |
| |
| /** For operations that pass on transaction actions. */ |
| protected DatasetGraph getT() { return get(); } |
| |
| /** |
| * Create a operations wrapper around {@code dsg}. |
| * The {@link Context} of the wrapper is the context of the {@code dsg}. |
| */ |
| public DatasetGraphWrapper(DatasetGraph dsg) { |
| this(dsg, (dsg == null) ? null : dsg.getContext()); |
| } |
| |
| /** |
| * Create a operations wrapper around {@code dsg} with {@code context}. |
| */ |
| public DatasetGraphWrapper(DatasetGraph dsg, Context context) { |
| this.dsg = dsg; |
| this.context = context; |
| } |
| |
| @Override |
| public boolean containsGraph(Node graphNode) |
| { return getR().containsGraph(graphNode); } |
| |
| @Override |
| public Graph getDefaultGraph() |
| { return getG().getDefaultGraph(); } |
| |
| @Override |
| public Graph getUnionGraph() |
| { return getG().getUnionGraph(); } |
| |
| @Override |
| public Graph getGraph(Node graphNode) |
| { return getG().getGraph(graphNode); } |
| |
| @Override |
| public void addGraph(Node graphName, Graph graph) |
| { getW().addGraph(graphName, graph); } |
| |
| @Override |
| public void removeGraph(Node graphName) |
| { getW().removeGraph(graphName); } |
| |
| @Override |
| public void setDefaultGraph(Graph g) |
| { getW().setDefaultGraph(g); } |
| |
| @Override |
| public Lock getLock() |
| { return getR().getLock(); } |
| |
| @Override |
| public Iterator<Node> listGraphNodes() |
| { return getR().listGraphNodes(); } |
| |
| @Override |
| public void add(Quad quad) |
| { getW().add(quad); } |
| |
| @Override |
| public void delete(Quad quad) |
| { getW().delete(quad); } |
| |
| @Override |
| public void add(Node g, Node s, Node p, Node o) |
| { getW().add(g, s, p, o); } |
| |
| @Override |
| public void delete(Node g, Node s, Node p, Node o) |
| { getW().delete(g, s, p, o); } |
| |
| @Override |
| public void deleteAny(Node g, Node s, Node p, Node o) |
| { getW().deleteAny(g, s, p, o); } |
| |
| @Override |
| public void clear() |
| { getW().clear(); } |
| |
| @Override |
| public boolean isEmpty() |
| { return getR().isEmpty(); } |
| |
| @Override |
| public Iterator<Quad> find() |
| { return getR().find(); } |
| |
| @Override |
| public Iterator<Quad> find(Quad quad) |
| { return getR().find(quad); } |
| |
| @Override |
| public Iterator<Quad> find(Node g, Node s, Node p, Node o) |
| { return getR().find(g, s, p, o); } |
| |
| @Override |
| public Iterator<Quad> findNG(Node g, Node s, Node p, Node o) |
| { return getR().findNG(g, s, p, o); } |
| |
| @Override |
| public boolean contains(Quad quad) |
| { return getR().contains(quad); } |
| |
| @Override |
| public boolean contains(Node g, Node s, Node p, Node o) |
| { return getR().contains(g, s, p, o); } |
| |
| @Override |
| public Context getContext() |
| { return getCxt(); } |
| |
| @Override |
| public long size() |
| { return getR().size(); } |
| |
| @Override |
| public void close() |
| { getW().close(); } |
| |
| @Override |
| public String toString() { |
| DatasetGraph dsg = getR(); |
| return Txn.calculateRead(dsg, ()->dsg.toString() ); |
| } |
| |
| @Override |
| public void sync() { |
| // Pass down sync. |
| SystemARQ.sync(getW()); |
| } |
| |
| @Override |
| public void begin() { getT().begin(); } |
| |
| @Override |
| public ReadWrite transactionMode() |
| { return getT().transactionMode(); } |
| |
| @Override |
| public TxnType transactionType() |
| { return getT().transactionType(); } |
| |
| @Override |
| public void begin(TxnType type) |
| { getT().begin(type); } |
| |
| @Override |
| public void begin(ReadWrite readWrite) |
| { getT().begin(readWrite); } |
| |
| @Override |
| public boolean promote() |
| { return getT().promote(); } |
| |
| @Override |
| public boolean promote(Promote type) |
| { return getT().promote(type); } |
| |
| @Override |
| public void commit() |
| { getT().commit(); } |
| |
| @Override |
| public void abort() |
| { getT().abort(); } |
| |
| @Override |
| public void end() |
| { getT().end(); } |
| |
| @Override |
| public boolean isInTransaction() |
| { return get().isInTransaction(); } |
| |
| @Override |
| public boolean supportsTransactions() |
| { return getT().supportsTransactions(); } |
| |
| @Override |
| public boolean supportsTransactionAbort() |
| { return getT().supportsTransactionAbort(); } |
| |
| } |