| /******************************************************************************* |
| * 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.ArrayList; |
| import java.util.Collection; |
| import java.util.Collections; |
| 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.AnyType; |
| import org.eclipse.wst.xml.xpath2.processor.internal.types.QName; |
| |
| /** |
| * Returns the items of $sourceSeq in a non-deterministic order. |
| */ |
| public class FnUnordered extends Function { |
| /** |
| * Constructor for FnUnordered. |
| */ |
| public FnUnordered() { |
| super(new QName("unordered"), 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 { |
| return unordered(args); |
| } |
| |
| /** |
| * Unordered operation. |
| * |
| * @param args |
| * Result from the expressions evaluation. |
| * @throws DynamicError |
| * Dynamic error. |
| * @return Result of fn:unordered operation. |
| */ |
| public static ResultSequence unordered(Collection args) throws DynamicError { |
| |
| assert args.size() == 1; |
| |
| // get args |
| Iterator citer = args.iterator(); |
| ResultSequence arg = (ResultSequence) citer.next(); |
| |
| if (arg.empty()) |
| return ResultBuffer.EMPTY; |
| |
| // XXX lame |
| ArrayList tmp = new ArrayList(); |
| for (Iterator i = arg.iterator(); i.hasNext();) |
| tmp.add(i.next()); |
| |
| Collections.shuffle(tmp); |
| |
| ResultBuffer rb = new ResultBuffer(); |
| for (Iterator i = tmp.iterator(); i.hasNext();) |
| rb.add((AnyType) i.next()); |
| |
| return rb.getSequence(); |
| } |
| } |