| /* |
| * 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.structure.util.reference; |
| |
| import org.apache.tinkerpop.gremlin.process.computer.util.ComputerGraph; |
| import org.apache.tinkerpop.gremlin.structure.Edge; |
| import org.apache.tinkerpop.gremlin.structure.Element; |
| import org.apache.tinkerpop.gremlin.structure.Graph; |
| import org.apache.tinkerpop.gremlin.structure.Vertex; |
| import org.apache.tinkerpop.gremlin.structure.VertexProperty; |
| import org.apache.tinkerpop.gremlin.structure.util.Attachable; |
| import org.apache.tinkerpop.gremlin.structure.util.ElementHelper; |
| import org.apache.tinkerpop.gremlin.structure.util.empty.EmptyGraph; |
| |
| import java.io.Serializable; |
| |
| /** |
| * @author Marko A. Rodriguez (http://markorodriguez.com) |
| */ |
| public abstract class ReferenceElement<E extends Element> implements Element, Serializable, Attachable<E> { |
| |
| protected Object id; |
| protected String label; |
| |
| protected ReferenceElement() { |
| |
| } |
| |
| protected ReferenceElement(final Object id, final String label) { |
| this.id = id; |
| this.label = label; |
| } |
| |
| public ReferenceElement(final Element element) { |
| this.id = element.id(); |
| try { |
| //Exception creation takes too much time, return default values for known types |
| if (element instanceof ComputerGraph.ComputerAdjacentVertex) { |
| this.label = Vertex.DEFAULT_LABEL; |
| } else { |
| this.label = element.label(); |
| } |
| } catch (final UnsupportedOperationException e) { |
| if (element instanceof Vertex) |
| this.label = Vertex.DEFAULT_LABEL; |
| else if (element instanceof Edge) |
| this.label = Edge.DEFAULT_LABEL; |
| else |
| this.label = VertexProperty.DEFAULT_LABEL; |
| } |
| } |
| |
| @Override |
| public Object id() { |
| return this.id; |
| } |
| |
| @Override |
| public String label() { |
| return this.label; |
| } |
| |
| @Override |
| public Graph graph() { |
| return EmptyGraph.instance(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return ElementHelper.hashCode(this); |
| } |
| |
| @SuppressWarnings("EqualsWhichDoesntCheckParameterClass") |
| @Override |
| public boolean equals(final Object other) { |
| return ElementHelper.areEqual(this, other); |
| } |
| |
| public E get() { |
| return (E) this; |
| } |
| } |