| /* |
| * 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.lambda; |
| |
| import org.apache.tinkerpop.gremlin.process.traversal.Traverser; |
| import org.apache.tinkerpop.gremlin.structure.Element; |
| import org.apache.tinkerpop.gremlin.structure.Property; |
| import org.apache.tinkerpop.gremlin.structure.T; |
| |
| import java.util.Objects; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public final class TokenTraversal<S, E> extends AbstractLambdaTraversal<S, E> { |
| |
| private E e; |
| private final T t; |
| |
| public TokenTraversal(final T t) { |
| this.t = t; |
| } |
| |
| @Override |
| public E next() { |
| return this.e; |
| } |
| |
| @Override |
| public void addStart(final Traverser.Admin<S> start) { |
| final S s = start.get(); |
| if (s instanceof Element) |
| this.e = (E) this.t.apply((Element) start.get()); |
| else if (s instanceof Property) { |
| // T.apply() doesn't work on Property because the inheritance hierarchy doesn't make it an Element. have |
| // to special case it here. only T.key/value make any sense for it. |
| if (t == T.key) |
| this.e = (E) ((Property) s).key(); |
| else if (t == T.value) |
| this.e = ((Property<E>) s).value(); |
| else |
| throw new IllegalStateException(String.format("TokenTraversal support of Property does not allow selection by %s", t)); |
| } else |
| throw new IllegalStateException(String.format("TokenTraversal support of %s does not allow selection by %s", s.getClass().getName(), t)); |
| |
| } |
| |
| @Override |
| public String toString() { |
| return this.t.toString(); |
| } |
| |
| public T getToken() { |
| return this.t; |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.getClass().hashCode() ^ this.t.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(final Object other) { |
| return other instanceof TokenTraversal |
| && Objects.equals(((TokenTraversal) other).t, this.t); |
| } |
| } |