/*
 * Copyright 1999-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "FunctionString.hpp"


#include <xalanc/PlatformSupport/XalanMessageLoader.hpp>


#include <xalanc/DOMSupport/DOMServices.hpp>


#include "XObjectFactory.hpp"


XALAN_CPP_NAMESPACE_BEGIN


FunctionString::FunctionString()
{
}


FunctionString::~FunctionString()
{
}


XObjectPtr
FunctionString::execute(
			XPathExecutionContext&	executionContext,
			XalanNode*				context,
			const LocatorType*		locator) const
{
	if (context == 0)
	{
		executionContext.error(
			XalanMessageLoader::getMessage(XalanMessages::FunctionRequiresNonNullContextNode_1Param, "string"),
				context,
				locator);

		// Dummy return value...
		return XObjectPtr();
	}
	else
	{
		// The XPath standard says that if there are no arguments,
		// the argument defaults to a node set with the context node
		// as the only member.  The string value of a node set is the
		// string value of the first node in the node set.
		// DOMServices::getNodeData() will give us the data.

		// Get a cached string...
		XPathExecutionContext::GetAndReleaseCachedString	theData(executionContext);

		XalanDOMString&		theString = theData.get();

		DOMServices::getNodeData(*context, theString);

		return executionContext.getXObjectFactory().createString(theData);
	}
}


XObjectPtr
FunctionString::execute(
			XPathExecutionContext&	executionContext,
			XalanNode*				/* context */,			
			const XObjectPtr		arg1,
			const LocatorType*		/* locator */) const
{
	assert(arg1.null() == false);	

	if (arg1->getType() == XObject::eTypeString)
	{
		// Since XObjects are reference counted, just return the
		// argument.
		return arg1;
	}
	else
	{
		return executionContext.getXObjectFactory().createStringAdapter(arg1);
	}
}


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


const XalanDOMString
FunctionString::getError() const
{

	return XalanMessageLoader::getMessage(XalanMessages::FunctionTakesZeroOrOneArg_1Param, "string()");
}


XALAN_CPP_NAMESPACE_END