/*
 * 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.
 */
#if !defined(XALAN_AVTPART_HEADER_GUARD)
#define XALAN_AVTPART_HEADER_GUARD 

/**
 * $Id: AVTPart.hpp,v 1.5 2004/11/08 18:18:56 dmitryh Exp $
 * 
 * $State: Exp $
 * 
 */

// Base include file.  Must be first.
#include "XSLTDefinitions.hpp"



XALAN_CPP_NAMESPACE_BEGIN



class XalanDOMString;
class XalanNode;
class PrefixResolver;
class XPathExecutionContext;



/**
 * Class to hold a part, either a string or XPath, 
 * of an Attribute Value Template.
 */
class AVTPart
{
public:

	AVTPart();

	virtual
	~AVTPart();

	/**
	 * Append the value to the buffer.
	 *
	 * @param buf              buffer to write into
	 * @param contextNode      current context node
	 * @param prefixResolver   prefix resolver to use
	 * @param executionContext execution context
	 */
	virtual void
	evaluate(
			XalanDOMString&			buf,
			XalanNode*				contextNode,
			const PrefixResolver&	prefixResolver,
			XPathExecutionContext&	executionContext) const = 0;

	/**
	 * Append the value to the buffer.
	 *
	 * @param buf              buffer to write into
	 * @param prefixResolver   prefix resolver to use
	 * @param executionContext execution context
	 */
	virtual void
	evaluate(
			XalanDOMString&			buf,
			const PrefixResolver&	prefixResolver,
			XPathExecutionContext&	executionContext) const = 0;
};



XALAN_CPP_NAMESPACE_END



#endif //XALAN_AVTPART_HEADER_GUARD 
