| /* |
| * 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.jena.sparql.syntax; |
| |
| import org.apache.jena.sparql.util.NodeIsomorphismMap ; |
| |
| /** An optional element in a query. */ |
| |
| public class ElementOptional extends Element |
| { |
| Element optionalPart ; |
| |
| public ElementOptional(Element optionalPart) |
| { |
| this.optionalPart = optionalPart ; |
| } |
| |
| public Element getOptionalElement() { return optionalPart ; } |
| |
| @Override |
| public int hashCode() |
| { |
| int hash = Element.HashOptional ; |
| hash = hash ^ getOptionalElement().hashCode() ; |
| return hash ; |
| } |
| |
| @Override |
| public boolean equalTo(Element el2, NodeIsomorphismMap isoMap) |
| { |
| if ( el2 == null ) return false ; |
| |
| if ( ! ( el2 instanceof ElementOptional ) ) |
| return false ; |
| |
| ElementOptional opt2 = (ElementOptional)el2 ; |
| return getOptionalElement().equalTo(opt2.getOptionalElement(), isoMap) ; |
| } |
| |
| @Override |
| public void visit(ElementVisitor v) { v.visit(this) ; } |
| } |