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JENA-1447: Merge commit 'refs/pull/328/head' of github.com:apache/jena
This closes apache#328.
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104 changes: 104 additions & 0 deletions
104
jena-arq/src/main/java/org/apache/jena/sparql/core/DatasetGraphSink.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,104 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.jena.sparql.core; | ||
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| import java.util.Iterator; | ||
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| import org.apache.jena.atlas.iterator.Iter; | ||
| import org.apache.jena.graph.Graph; | ||
| import org.apache.jena.graph.Node; | ||
| import org.apache.jena.query.ReadWrite; | ||
| import org.apache.jena.sparql.graph.GraphSink; | ||
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| /** | ||
| * An always empty {@link DatasetGraph} that accepts changes but ignores them. | ||
| * | ||
| * @see DatasetGraphZero | ||
| */ | ||
| public class DatasetGraphSink extends DatasetGraphBaseFind { | ||
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| public static DatasetGraph create() { return new DatasetGraphSink(); } | ||
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| private Graph dftGraph = GraphSink.instance(); | ||
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| public DatasetGraphSink() {} | ||
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| private TransactionalNull txn = TransactionalNull.create(); | ||
| @Override public void begin(ReadWrite mode) { txn.begin(mode); } | ||
| @Override public void commit() { txn.commit(); } | ||
| @Override public void abort() { txn.abort(); } | ||
| @Override public boolean isInTransaction() { return txn.isInTransaction(); } | ||
| @Override public void end() { txn.end(); } | ||
| @Override public boolean supportsTransactions() { return true; } | ||
| // Because there are never any changes, abort() means "finish". | ||
| @Override public boolean supportsTransactionAbort() { return true; } | ||
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| @Override | ||
| public Iterator<Node> listGraphNodes() { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| protected Iterator<Quad> findInDftGraph(Node s, Node p, Node o) { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| protected Iterator<Quad> findInSpecificNamedGraph(Node g, Node s, Node p, Node o) { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| protected Iterator<Quad> findInAnyNamedGraphs(Node s, Node p, Node o) { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| public Graph getDefaultGraph() { | ||
| return dftGraph; | ||
| } | ||
| @Override | ||
| public Graph getGraph(Node graphNode) { | ||
| return null; | ||
| } | ||
| @Override | ||
| public void add(Quad quad) { /* ignore */ } | ||
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| @Override | ||
| public void delete(Quad quad) { /* ignore */ } | ||
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| @Override | ||
| public void deleteAny(Node g, Node s, Node p, Node o) { /* ignore */ } | ||
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| @Override | ||
| public void setDefaultGraph(Graph g) { /* ignore */ } | ||
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| @Override | ||
| public void addGraph(Node graphName, Graph graph) { /* ignore */ } | ||
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| @Override | ||
| public void removeGraph(Node graphName) { /* ignore */ } | ||
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| @Override | ||
| public void close() { | ||
| txn.remove(); | ||
| txn = null; | ||
| } | ||
| } |
107 changes: 107 additions & 0 deletions
107
jena-arq/src/main/java/org/apache/jena/sparql/core/DatasetGraphZero.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.jena.sparql.core; | ||
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| import java.util.Iterator; | ||
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| import org.apache.jena.atlas.iterator.Iter; | ||
| import org.apache.jena.graph.Graph; | ||
| import org.apache.jena.graph.Node; | ||
| import org.apache.jena.query.ReadWrite; | ||
| import org.apache.jena.sparql.graph.GraphZero; | ||
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| /** An always empty {@link DatasetGraph}. | ||
| * One graph (the default graph) with zero triples. | ||
| * No changes allowed - this is not a sink. | ||
| * @see DatasetGraphSink | ||
| */ | ||
| public class DatasetGraphZero extends DatasetGraphBaseFind { | ||
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| public static DatasetGraph create() { return new DatasetGraphZero(); } | ||
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| private Graph dftGraph = GraphZero.instance(); | ||
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| public DatasetGraphZero() {} | ||
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| private TransactionalNull txn = TransactionalNull.create(); | ||
| @Override public void begin(ReadWrite mode) { txn.begin(mode); } | ||
| @Override public void commit() { txn.commit(); } | ||
| @Override public void abort() { txn.abort(); } | ||
| @Override public boolean isInTransaction() { return txn.isInTransaction(); } | ||
| @Override public void end() { txn.end(); } | ||
| @Override public boolean supportsTransactions() { return true; } | ||
| // Because there are never any changes, abort() means "finish". | ||
| @Override public boolean supportsTransactionAbort() { return true; } | ||
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| @Override | ||
| public Iterator<Node> listGraphNodes() { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| protected Iterator<Quad> findInDftGraph(Node s, Node p, Node o) { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| protected Iterator<Quad> findInSpecificNamedGraph(Node g, Node s, Node p, Node o) { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| protected Iterator<Quad> findInAnyNamedGraphs(Node s, Node p, Node o) { | ||
| return Iter.nullIterator(); | ||
| } | ||
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| @Override | ||
| public Graph getDefaultGraph() { | ||
| return dftGraph; | ||
| } | ||
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| @Override | ||
| public Graph getGraph(Node graphNode) { | ||
| return null; | ||
| } | ||
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| @Override | ||
| public void add(Quad quad) { unsupportedMethod(this, "add") ; } | ||
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| @Override | ||
| public void delete(Quad quad) { unsupportedMethod(this, "delete") ; } | ||
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| @Override | ||
| public void deleteAny(Node g, Node s, Node p, Node o) { | ||
| throw new UnsupportedOperationException("deleteAny"); | ||
| } | ||
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| @Override | ||
| public void setDefaultGraph(Graph g) { | ||
| throw new UnsupportedOperationException("setDefaultGraph"); | ||
| } | ||
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| @Override | ||
| public void addGraph(Node graphName, Graph graph) { | ||
| throw new UnsupportedOperationException("addGraph"); | ||
| } | ||
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| @Override | ||
| public void removeGraph(Node graphName) { | ||
| throw new UnsupportedOperationException("removeGraph"); | ||
| } | ||
| } |
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