2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
19 * $Id: Plus.java 468655 2006-10-28 07:12:06Z minchau $
21 package org.apache.xpath.operations;
23 import org.apache.xpath.XPathContext;
24 import org.apache.xpath.objects.XNumber;
25 import org.apache.xpath.objects.XObject;
28 * The '+' operation expression executer.
30 public class Plus extends Operation
32 static final long serialVersionUID = -4492072861616504256L;
35 * Apply the operation to two operands, and return the result.
38 * @param left non-null reference to the evaluated left operand.
39 * @param right non-null reference to the evaluated right operand.
41 * @return non-null reference to the XObject that represents the result of the operation.
43 * @throws javax.xml.transform.TransformerException
45 public XObject operate(XObject left, XObject right)
46 throws javax.xml.transform.TransformerException
48 return new XNumber(left.num() + right.num());
52 * Evaluate this operation directly to a double.
54 * @param xctxt The runtime execution context.
56 * @return The result of the operation as a double.
58 * @throws javax.xml.transform.TransformerException
60 public double num(XPathContext xctxt)
61 throws javax.xml.transform.TransformerException
64 return (m_right.num(xctxt) + m_left.num(xctxt));