| /** |
| * 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.Collections ; |
| import java.util.LinkedList ; |
| import java.util.List ; |
| |
| import org.apache.jena.atlas.lib.Pair ; |
| import org.apache.jena.graph.Node ; |
| |
| /** Capture a record of quad actions */ |
| public class DatasetChangesCapture implements DatasetChanges { |
| // ArrayLists have an annoying issue that they grow by copying the internal |
| // []-array. |
| // This growth is by a fixed factor of adding 50% which for an array |
| // with little guidance as to likely size, can lead to undesirable GC |
| // and copy-time issues. |
| // Using a LinkedList avoids this although it adds overhead for list |
| // entries. |
| private List<Pair<QuadAction, Quad>> actions ; |
| final private boolean captureAdd ; |
| final private boolean captureDelete ; |
| final private boolean captureNoAdd ; |
| final private boolean captureNoDelete ; |
| |
| /** Capture quad actions, excluding no-ops */ |
| public DatasetChangesCapture() { |
| this(true, true, false, false) ; |
| } |
| |
| /** |
| * Capture quad actions, either including or excluding the "no ops" |
| * |
| * @param recordNoOps |
| * Whether to record {@link QuadAction#NO_ADD} and |
| * {@link QuadAction#NO_DELETE} |
| */ |
| public DatasetChangesCapture(boolean recordNoOps) { |
| this(true, true, recordNoOps, recordNoOps) ; |
| } |
| |
| /** Capture quad actions, selectively by category */ |
| public DatasetChangesCapture(boolean captureAdd, boolean captureDelete, boolean captureNoAdd, boolean captureNoDelete) { |
| this.captureAdd = captureAdd ; |
| this.captureDelete = captureDelete ; |
| this.captureNoAdd = captureNoAdd ; |
| this.captureNoDelete = captureNoDelete ; |
| this.actions = new LinkedList<>() ; |
| } |
| |
| /** The actions recorded. |
| * Only valid until the next {@code start} call. |
| */ |
| public List<Pair<QuadAction, Quad>> getActions() { |
| return Collections.unmodifiableList(actions) ; |
| } |
| |
| @Override |
| public void start() { |
| if ( actions == null ) |
| actions = new LinkedList<>() ; |
| } |
| |
| @Override |
| public void change(QuadAction qaction, Node g, Node s, Node p, Node o) { |
| Quad q = new Quad(g, s, p, o) ; |
| Pair<QuadAction, Quad> pair = Pair.create(qaction, q) ; |
| |
| switch (qaction) { |
| case ADD : |
| if ( captureAdd ) |
| actions.add(pair) ; |
| break ; |
| case DELETE : |
| if ( captureDelete ) |
| actions.add(pair) ; |
| break ; |
| case NO_ADD : |
| if ( captureNoAdd ) |
| actions.add(pair) ; |
| break ; |
| case NO_DELETE : |
| if ( captureNoDelete ) |
| actions.add(pair) ; |
| break ; |
| } |
| } |
| |
| @Override |
| public void finish() {} |
| |
| @Override |
| public void reset() { |
| if ( actions != null ) |
| actions.clear() ; |
| actions = null ; |
| } |
| } |