| /******************************************************************************* |
| * Copyright (c) 2005, 2010 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 |
| *******************************************************************************/ |
| |
| package org.eclipse.wst.xml.xpath2.processor.internal.function; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.wst.xml.xpath2.api.ResultBuffer; |
| 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; |
| |
| /** |
| * Returns the number with no fractional part that is closest to the argument. |
| * If there are two such numbers, then the one that is closest to positive |
| * infinity is returned. More formally, fn:round(x) produces the same result as |
| * fn:floor(x+0.5). If type of $arg is one of the four numeric types xs:float, |
| * xs:double, xs:decimal or xs:integer the type of the return is the same as the |
| * type of $arg. If the type of $arg is a type derived from one of the numeric |
| * types, the type of the return is the base numeric type. |
| */ |
| public class FnRound extends Function { |
| /** |
| * Constructor for FnRound. |
| */ |
| public FnRound() { |
| super(new QName("round"), 1); |
| } |
| |
| /** |
| * 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 { |
| // 1 argument only! |
| assert args.size() >= min_arity() && args.size() <= max_arity(); |
| |
| ResultSequence argument = (ResultSequence) args.iterator().next(); |
| |
| return fn_round(argument); |
| } |
| |
| /** |
| * Round operation. |
| * |
| * @param arg |
| * Result from the expressions evaluation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:round operation. |
| */ |
| public static ResultSequence fn_round(ResultSequence arg) |
| throws DynamicError { |
| |
| // sanity chex |
| NumericType nt = FnAbs.get_single_numeric_arg(arg); |
| |
| // empty arg |
| if (nt == null) |
| return ResultBuffer.EMPTY; |
| |
| return nt.round(); |
| } |
| } |