src/XalanExtensions/FunctionDifference.cpp

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
#include "FunctionDifference.hpp"



#include <XPath/XPathExecutionContext.hpp>
#include <XPath/XObjectFactory.hpp>



FunctionDifference::FunctionDifference()
{
}



FunctionDifference::~FunctionDifference()
{
}



XObjectPtr
FunctionDifference::execute(
			XPathExecutionContext&			executionContext,
			XalanNode*						context,
			const XObjectArgVectorType&		args,
			const Locator*					locator) const
{
	if (args.size() != 2)
	{
		executionContext.error(getError(), context, locator);
	}

	assert(args[0].null() == false && args[1].null() == false);

	const NodeRefListBase&	nodeset1 = args[0]->nodeset();
	const NodeRefListBase&	nodeset2 = args[1]->nodeset();

	typedef XPathExecutionContext::BorrowReturnMutableNodeRefList	BorrowReturnMutableNodeRefList;

	BorrowReturnMutableNodeRefList	theResult(executionContext);

	const NodeRefListBase::size_type	theLength = nodeset1.getLength();

	// Check the second node-set for nodes in the
	// first node-set.  If a node is not found,
	// add it to the result.
	for (NodeRefListBase::size_type i = 0; i < theLength; ++i)
	{
		XalanNode* const	theNode = nodeset1.item(i);
		assert(theNode != 0);

		if (nodeset2.indexOf(theNode) == NodeRefListBase::npos)
		{
			theResult->addNodeInDocOrder(theNode, executionContext);
		}
	}

	theResult->setDocumentOrder();

	return executionContext.getXObjectFactory().createNodeSet(theResult);
}



#if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
Function*
#else
FunctionDifference*
#endif
FunctionDifference::clone() const
{
	return new FunctionDifference(*this);
}



const XalanDOMString
FunctionDifference::getError() const
{
	return StaticStringToDOMString(XALAN_STATIC_UCODE_STRING("The difference() function accepts two arguments"));
}