| /******************************************************************************* |
| * Copyright (c) 2005, 2011 Andrea Bittau, University College London, and others |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Andrea Bittau - initial API and implementation from the PsychoPath XPath 2.0 |
| * Jesper Steen Moeller - bug 285145 - implement full arity checking |
| * Mukul Gandhi - bug 280798 - PsychoPath support for JDK 1.4 |
| * Jesper Steen Moller - bug 340933 - Migrate to new XPath2 API |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal.function; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.wst.xml.xpath2.api.Item; |
| import org.eclipse.wst.xml.xpath2.api.ResultSequence; |
| import org.eclipse.wst.xml.xpath2.processor.DynamicError; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.NumericType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| |
| /** |
| * Class for Minus function. |
| */ |
| public class FsMinus extends Function { |
| /** |
| * Constructor for FsMinus. |
| */ |
| public FsMinus() { |
| super(new QName("minus"), 2); |
| } |
| |
| /** |
| * Evaluate arguments. |
| * |
| * @param args |
| * argument expressions. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of evaluation. |
| */ |
| public ResultSequence evaluate(Collection args, org.eclipse.wst.xml.xpath2.api.EvaluationContext ec) throws DynamicError { |
| assert args.size() >= min_arity() && args.size() <= max_arity(); |
| |
| return fs_minus(args); |
| } |
| |
| /** |
| * General operation on the arguments. |
| * |
| * @param args |
| * input arguments. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of the operation. |
| */ |
| public static ResultSequence fs_minus(Collection args) throws DynamicError { |
| return FsPlus.do_math_op(args, MathMinus.class, "minus"); |
| } |
| |
| /** |
| * Unary operation on the values of the arguments. |
| * |
| * @param args |
| * input arguments. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of the operation. |
| */ |
| public static ResultSequence fs_minus_unary(Collection args) |
| throws DynamicError { |
| // make sure we got only one arg |
| if (args.size() != 1) |
| DynamicError.throw_type_error(); |
| ResultSequence arg = (org.eclipse.wst.xml.xpath2.api.ResultSequence) args.iterator().next(); |
| |
| // make sure we got only one numeric atom |
| if (arg.size() != 1) |
| DynamicError.throw_type_error(); |
| Item at = arg.first(); |
| if (!(at instanceof NumericType)) |
| DynamicError.throw_type_error(); |
| |
| NumericType nt = (NumericType) at; |
| |
| return nt.unary_minus(); |
| } |
| } |