| /* |
| * 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.step.util; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Traversal; |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| import org.apache.tinkerpop.gremlin.process.traversal.traverser.TraverserRequirement; |
| |
| import java.util.Collections; |
| import java.util.EnumSet; |
| import java.util.NoSuchElementException; |
| import java.util.Set; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class RequirementsStep<S> extends AbstractStep<S, S> { |
| |
| private final Set<TraverserRequirement> requirements; |
| |
| public RequirementsStep(final Traversal.Admin traversal, final Set<TraverserRequirement> requirements) { |
| super(traversal); |
| |
| if (requirements == null || requirements.isEmpty()) { |
| this.requirements = EnumSet.noneOf(TraverserRequirement.class); |
| } else { |
| this.requirements = EnumSet.copyOf(requirements); |
| } |
| |
| } |
| |
| public void addRequirement(final TraverserRequirement requirement) { |
| this.requirements.add(requirement); |
| } |
| |
| @Override |
| public Set<TraverserRequirement> getRequirements() { |
| return this.requirements; |
| } |
| |
| @Override |
| protected Traverser.Admin<S> processNextStart() throws NoSuchElementException { |
| return this.starts.next(); |
| } |
| } |