Github user rvesse commented on a diff in the pull request:
https://github.com/apache/jena/pull/465#discussion_r213249005
--- Diff:
jena-arq/src/main/java/org/apache/jena/sparql/core/DatasetGraphFilteredView.java
---
@@ -0,0 +1,159 @@
+/*
+ * 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.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.function.Predicate;
+
+import org.apache.jena.atlas.iterator.Iter;
+import org.apache.jena.atlas.logging.Log;
+import org.apache.jena.graph.Graph;
+import org.apache.jena.graph.Node;
+import org.apache.jena.sparql.graph.GraphReadOnly;
+import org.apache.jena.sparql.graph.GraphUnionRead;
+
+/**
+ * A read-only {@link DatasetGraph} that applies a filter testing all
triples and quads
+ * returned by accessing the data. Only quads where the filter tests for
"true" are exposed.
+ */
+public class DatasetGraphFilteredView extends DatasetGraphReadOnly
implements DatasetGraphWrapperView {
+ /*
+ Write operations
+ add(Quad)
+ delete(Quad)
+ add(Node, Node, Node, Node)
+ delete(Node, Node, Node, Node)
+ deleteAny(Node, Node, Node, Node)
+ clear()
+
+ Read operations
+ listGraphNodes()
+ isEmpty()
+ find()
+ find(Quad)
+ find(Node, Node, Node, Node)
+ findNG(Node, Node, Node, Node)
+ contains(Quad)
+ contains(Node, Node, Node, Node)
+ size()
+ toString()
+
+ Graph operations
+ listGraphNodes()
+ getGraph(Node)
+ getDefaultGraph()
+ containsGraph(Node)
+ */
+
+ private final Predicate<Quad> quadFilter;
+ private final Collection<Node> visibleGraphs;
+
+ public DatasetGraphFilteredView(DatasetGraph dsg, Predicate<Quad>
filter, Collection<Node> visibleGraphs) {
+ super(dsg);
+ this.quadFilter = filter;
+ if ( visibleGraphs.contains(Quad.defaultGraphIRI) ||
visibleGraphs.contains(Quad.defaultGraphNodeGenerated) ) {
+ Log.warn(DatasetGraphFilteredView.class, "default graph Node
in visibleGraphs colelction - fix up applied");
--- End diff --
Typo -> `colelction`
---
