| /******************************************************************************* |
| * 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 java.util.Iterator; |
| |
| 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.TypeError; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.NumericType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| |
| /** |
| * The value returned is the nearest (that is, numerically closest) numeric to |
| * $arg that is a multiple of ten to the power of minus $precision. If two such |
| * values are equally near (e.g. if the fractional part in $arg is exactly |
| * .500...), returns the one whose least significant digit is even. 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 FnRoundHalfToEven extends Function { |
| /** |
| * Constructor for FnRoundHalfToEven. |
| */ |
| public FnRoundHalfToEven() { |
| super(new QName("round-half-to-even"), 1, 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 { |
| ResultSequence argument = (ResultSequence) args.iterator().next(); |
| if (args.size() == 2) { |
| return fn_round_half_to_even(args); |
| } |
| |
| return fn_round_half_to_even(argument); |
| } |
| |
| /** |
| * Round-Half-to-Even operation. |
| * |
| * @param arg |
| * Result from the expressions evaluation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:round-half-to-even operation. |
| */ |
| public static ResultSequence fn_round_half_to_even(ResultSequence arg) |
| throws DynamicError { |
| |
| NumericType nt = FnAbs.get_single_numeric_arg(arg); |
| |
| // empty arg |
| if (nt == null) |
| return ResultBuffer.EMPTY; |
| |
| return nt.round_half_to_even(); |
| } |
| |
| public static ResultSequence fn_round_half_to_even(Collection args) throws DynamicError { |
| |
| if (args.size() > 2 || args.size() <= 1) { |
| throw new DynamicError(TypeError.invalid_type(null)); |
| } |
| |
| Iterator argIt = args.iterator(); |
| ResultSequence rsArg1 = (ResultSequence) argIt.next(); |
| ResultSequence rsPrecision = (ResultSequence) argIt.next(); |
| |
| NumericType nt = (NumericType) rsArg1.first(); |
| NumericType ntPrecision = (NumericType) rsPrecision.first(); |
| |
| return nt.round_half_to_even(Integer.parseInt(ntPrecision.getStringValue())); |
| } |
| } |