| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| package org.apache.xpath.operations; |
| |
| import org.apache.xpath.XPathContext; |
| import org.apache.xpath.objects.XNumber; |
| import org.apache.xpath.objects.XObject; |
| |
| /** |
| * The binary '-' operation expression executer. |
| */ |
| public class Minus extends Operation |
| { |
| static final long serialVersionUID = -5297672838170871043L; |
| |
| /** |
| * Apply the operation to two operands, and return the result. |
| * |
| * |
| * @param left non-null reference to the evaluated left operand. |
| * @param right non-null reference to the evaluated right operand. |
| * |
| * @return non-null reference to the XObject that represents the |
| * result of the operation. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public XObject operate(XObject left, XObject right) |
| throws javax.xml.transform.TransformerException |
| { |
| return new XNumber(left.num() - right.num()); |
| } |
| |
| /** |
| * Evaluate this operation directly to a double. |
| * |
| * @param xctxt The runtime execution context. |
| * |
| * @return The result of the operation as a double. |
| * |
| * @throws javax.xml.transform.TransformerException |
| */ |
| public double num(XPathContext xctxt) |
| throws javax.xml.transform.TransformerException |
| { |
| |
| return (m_left.num(xctxt) - m_right.num(xctxt)); |
| } |
| |
| } |