| /* |
| * 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.engine; |
| |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.Iterator; |
| |
| import org.apache.jena.graph.Graph; |
| import org.apache.jena.sparql.core.DatasetGraph; |
| import org.apache.jena.sparql.engine.main.OpExecutorFactory; |
| import org.apache.jena.sparql.function.FunctionEnv; |
| import org.apache.jena.sparql.util.Context; |
| |
| public class ExecutionContext implements FunctionEnv |
| { |
| private static boolean TrackAllIterators = false; |
| |
| private Context context = null; |
| private DatasetGraph dataset = null; |
| |
| // Iterator tracking |
| private Collection<QueryIterator> openIterators = null; |
| // Tracking all iterators leads to a build up of state, |
| private Collection<QueryIterator> allIterators = null; |
| private Graph activeGraph = null; |
| private OpExecutorFactory executor = null; |
| |
| /** Clone */ |
| public ExecutionContext(ExecutionContext other) |
| { |
| this.context = other.context; |
| this.dataset = other.dataset; |
| this.openIterators = other.openIterators; |
| this.allIterators = other.allIterators; |
| this.activeGraph = other.activeGraph; |
| this.executor = other.executor; |
| } |
| |
| /** Clone and change active graph - shares tracking */ |
| public ExecutionContext(ExecutionContext other, Graph activeGraph) |
| { |
| this(other); |
| this.activeGraph = activeGraph; |
| } |
| |
| public ExecutionContext(Context params, Graph activeGraph, DatasetGraph dataset, OpExecutorFactory factory) { |
| this.context = params; |
| this.dataset = dataset; |
| this.openIterators = new ArrayList<>(); |
| if ( TrackAllIterators ) |
| this.allIterators = new ArrayList<>(); |
| this.activeGraph = activeGraph; |
| this.executor = factory; |
| } |
| |
| @Override |
| public Context getContext() { return context; } |
| |
| public void openIterator(QueryIterator qIter) { |
| openIterators.add(qIter); |
| if ( allIterators != null ) |
| allIterators.add(qIter); |
| } |
| |
| public void closedIterator(QueryIterator qIter) { |
| openIterators.remove(qIter); |
| } |
| |
| public Iterator<QueryIterator> listOpenIterators() { |
| return openIterators.iterator(); |
| } |
| |
| public Iterator<QueryIterator> listAllIterators() { |
| if ( allIterators == null ) |
| return null; |
| return allIterators.iterator(); |
| } |
| |
| public OpExecutorFactory getExecutor() { |
| return executor; |
| } |
| |
| /** Setter for the policy for algebra expression evaluation - use with care */ |
| public void setExecutor(OpExecutorFactory executor) { |
| this.executor = executor; |
| } |
| |
| @Override |
| public DatasetGraph getDataset() { return dataset; } |
| |
| /** Return the active graph (the one matching is against at this point in the query. |
| * May be null if unknown or not applicable - for example, doing quad store access or |
| * when sorting |
| */ |
| @Override |
| public Graph getActiveGraph() { return activeGraph; } |
| } |