| /* |
| * 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.tinkerpop.gremlin.process.traversal.util; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategies; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy; |
| import org.apache.tinkerpop.gremlin.structure.util.StringFactory; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Optional; |
| import java.util.Set; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public class DefaultTraversalStrategies implements TraversalStrategies { |
| |
| protected Set<TraversalStrategy<?>> traversalStrategies = new LinkedHashSet<>(); |
| |
| @Override |
| @SuppressWarnings({"unchecked", "varargs"}) |
| public TraversalStrategies addStrategies(final TraversalStrategy<?>... strategies) { |
| for (final TraversalStrategy<?> addStrategy : strategies) { |
| // search by class to prevent strategies from being added more than once |
| getStrategy(addStrategy.getClass()).ifPresent(s -> this.traversalStrategies.remove(s)); |
| } |
| Collections.addAll(this.traversalStrategies, strategies); |
| this.traversalStrategies = TraversalStrategies.sortStrategies(this.traversalStrategies); |
| return this; |
| } |
| |
| @Override |
| @SuppressWarnings({"unchecked", "varargs"}) |
| public TraversalStrategies removeStrategies(final Class<? extends TraversalStrategy>... strategyClasses) { |
| boolean removed = false; |
| for (final Class<? extends TraversalStrategy> strategyClass : strategyClasses) { |
| final Optional<TraversalStrategy<?>> strategy = this.traversalStrategies.stream().filter(s -> s.getClass().equals(strategyClass)).findAny(); |
| if (strategy.isPresent()) { |
| this.traversalStrategies.remove(strategy.get()); |
| removed = true; |
| } |
| } |
| if (removed) |
| this.traversalStrategies = TraversalStrategies.sortStrategies(this.traversalStrategies); |
| return this; |
| } |
| |
| @Override |
| public List<TraversalStrategy<?>> toList() { |
| return Collections.unmodifiableList(new ArrayList<>(this.traversalStrategies)); |
| } |
| |
| @Override |
| public Iterator<TraversalStrategy<?>> iterator() { |
| return this.traversalStrategies.iterator(); |
| } |
| |
| @Override |
| public <T extends TraversalStrategy> Optional<T> getStrategy(final Class<T> traversalStrategyClass) { |
| for (final TraversalStrategy<?> traversalStrategy : this.traversalStrategies) { |
| if (traversalStrategyClass.isAssignableFrom(traversalStrategy.getClass())) |
| return (Optional) Optional.of(traversalStrategy); |
| } |
| return Optional.empty(); |
| } |
| |
| @Override |
| public DefaultTraversalStrategies clone() { |
| try { |
| final DefaultTraversalStrategies clone = (DefaultTraversalStrategies) super.clone(); |
| clone.traversalStrategies = new LinkedHashSet<>(this.traversalStrategies.size()); |
| clone.traversalStrategies.addAll(this.traversalStrategies); |
| return clone; |
| } catch (final CloneNotSupportedException e) { |
| throw new IllegalStateException(e.getMessage(), e); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return StringFactory.traversalStrategiesString(this); |
| } |
| } |