19f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 29f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Licensed to the Apache Software Foundation (ASF) under one 39f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * or more contributor license agreements. See the NOTICE file 49f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed with this work for additional information 59f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * regarding copyright ownership. The ASF licenses this file 69f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * to you under the Apache License, Version 2.0 (the "License"); 79f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * you may not use this file except in compliance with the License. 89f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * You may obtain a copy of the License at 99f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 109f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 119f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 129f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Unless required by applicable law or agreed to in writing, software 139f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 149f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 159f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * See the License for the specific language governing permissions and 169f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * limitations under the License. 179f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 189f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/* 199f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * $Id: Minus.java 468655 2006-10-28 07:12:06Z minchau $ 209f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 219f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpackage org.apache.xpath.operations; 229f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 239f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.XPathContext; 249f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XNumber; 259f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonimport org.apache.xpath.objects.XObject; 269f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 279f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson/** 289f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * The binary '-' operation expression executer. 299f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 309f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilsonpublic class Minus extends Operation 319f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson{ 329f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson static final long serialVersionUID = -5297672838170871043L; 339f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 349f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 359f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Apply the operation to two operands, and return the result. 369f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 379f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 389f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param left non-null reference to the evaluated left operand. 399f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param right non-null reference to the evaluated right operand. 409f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 419f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return non-null reference to the XObject that represents the 429f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * result of the operation. 439f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 449f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @throws javax.xml.transform.TransformerException 459f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 469f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public XObject operate(XObject left, XObject right) 479f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson throws javax.xml.transform.TransformerException 489f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 499f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return new XNumber(left.num() - right.num()); 509f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 519f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 529f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson /** 539f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * Evaluate this operation directly to a double. 549f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 559f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @param xctxt The runtime execution context. 569f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 579f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @return The result of the operation as a double. 589f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * 599f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson * @throws javax.xml.transform.TransformerException 609f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson */ 619f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson public double num(XPathContext xctxt) 629f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson throws javax.xml.transform.TransformerException 639f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson { 649f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 659f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson return (m_left.num(xctxt) - m_right.num(xctxt)); 669f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson } 679f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson 689f8118474e9513f7a5b7d2a05e4a0fb15d1a6569Jesse Wilson} 69