| /******************************************************************************* |
| * 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 |
| * 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.types.QName; |
| |
| /** |
| * <p> |
| * Sequence reverse function. |
| * </p> |
| * |
| * <p> |
| * Usage: fn:reverse($arg as item()*) as item()* |
| * </p> |
| * |
| * <p> |
| * This class reverses the order of items in a sequence. If $arg is the empty |
| * sequence, the empty sequence is returned. |
| * </p> |
| */ |
| public class FnReverse extends Function { |
| |
| /** |
| * Constructor for FnReverse. |
| */ |
| public FnReverse() { |
| super(new QName("reverse"), 1); |
| } |
| |
| /** |
| * Evaluate the arguments. |
| * |
| * @param args |
| * are evaluated. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return The evaluation of the reversal of the arguments. |
| */ |
| public ResultSequence evaluate(Collection args, org.eclipse.wst.xml.xpath2.api.EvaluationContext ec) throws DynamicError { |
| return reverse(args); |
| } |
| |
| /** |
| * Reverse the arguments. |
| * |
| * @param args |
| * are reversed. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return The result of the reversal of the arguments. |
| */ |
| public static ResultSequence reverse(Collection args) throws DynamicError { |
| |
| assert args.size() == 1; |
| |
| // get args |
| Iterator citer = args.iterator(); |
| ResultSequence arg = (ResultSequence) citer.next(); |
| |
| if (arg.size() <= 1) |
| return arg; |
| |
| ResultBuffer rs = new ResultBuffer(); |
| |
| for (int i = arg.size()-1; i >= 0; --i) |
| rs.add(arg.item(i)); |
| |
| return rs.getSequence(); |
| } |
| } |