| /* |
| * 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.strategy.verification; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.traversal.step.VertexComputing; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.TraversalStrategy; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.branch.RepeatStep; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.ProfileSideEffectStep; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.SideEffectCapStep; |
| import org.apache.tinkerpop.gremlin.process.traversal.step.util.ReducingBarrierStep; |
| import org.apache.tinkerpop.gremlin.process.traversal.strategy.AbstractTraversalStrategy; |
| import org.apache.tinkerpop.gremlin.process.traversal.util.TraversalHelper; |
| |
| import java.util.Collections; |
| import java.util.Set; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class StandardVerificationStrategy extends AbstractTraversalStrategy<TraversalStrategy.VerificationStrategy> implements TraversalStrategy.VerificationStrategy { |
| |
| private static final StandardVerificationStrategy INSTANCE = new StandardVerificationStrategy(); |
| |
| private StandardVerificationStrategy() { |
| } |
| |
| @Override |
| public void apply(final Traversal.Admin<?, ?> traversal) { |
| if (!traversal.getStrategies().toList().contains(ComputerVerificationStrategy.instance())) { |
| if (!TraversalHelper.getStepsOfAssignableClass(VertexComputing.class, traversal).isEmpty()) |
| throw new VerificationException("VertexComputing steps must be executed with a GraphComputer: " + TraversalHelper.getStepsOfAssignableClass(VertexComputing.class, traversal), traversal); |
| } |
| |
| traversal.getSteps().forEach(step -> { |
| if (step instanceof ReducingBarrierStep && step.getTraversal().getParent() instanceof RepeatStep && step.getTraversal().getParent().getGlobalChildren().get(0).getSteps().contains(step)) |
| throw new VerificationException("The parent of a reducing barrier can not be repeat()-step: " + step, traversal); |
| }); |
| |
| // The ProfileSideEffectStep must be the last step or the 2nd last step when accompanied by the cap step. |
| if (TraversalHelper.hasStepOfClass(ProfileSideEffectStep.class, traversal) && |
| !(traversal.asAdmin().getEndStep() instanceof ProfileSideEffectStep) && |
| !(traversal.asAdmin().getEndStep() instanceof SideEffectCapStep && traversal.asAdmin().getEndStep().getPreviousStep() instanceof ProfileSideEffectStep)) { |
| throw new VerificationException("When specified, the profile()-Step must be the last step or followed only by the cap()-step.", traversal); |
| } |
| |
| if (TraversalHelper.getStepsOfClass(ProfileSideEffectStep.class, traversal).size() > 1) { |
| throw new VerificationException("The profile()-Step cannot be specified multiple times.", traversal); |
| } |
| } |
| |
| public static StandardVerificationStrategy instance() { |
| return INSTANCE; |
| } |
| |
| @Override |
| public Set<Class<? extends VerificationStrategy>> applyPrior() { |
| return Collections.singleton(ComputerVerificationStrategy.class); |
| } |
| } |