#ifndef DOMXPathExpression_HEADER_GUARD_

#define DOMXPathExpression_HEADER_GUARD_

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You 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 <xercesc/util/XercesDefs.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class DOMNode;

/**

 * The <code>DOMXPathExpression</code> interface represents a parsed and resolved XPath expression.

 * @since DOM Level 3

 */

class CDOM_EXPORT DOMXPathExpression

{

protected:

    // -----------------------------------------------------------------------

    //  Hidden constructors

    // -----------------------------------------------------------------------

    /** @name Hidden constructors */

    //@{    

    DOMXPathExpression() {};

    //@}

private:

    // -----------------------------------------------------------------------

    // Unimplemented constructors and operators

    // -----------------------------------------------------------------------

    /** @name Unimplemented constructors and operators */

    //@{

    DOMXPathExpression(const DOMXPathExpression &);

    DOMXPathExpression& operator = (const  DOMXPathExpression&);

    //@}

public:

    // -----------------------------------------------------------------------

    //  All constructors are hidden, just the destructor is available

    // -----------------------------------------------------------------------

    /** @name Destructor */

    //@{

    /**

     * Destructor

     *

     */

    virtual ~DOMXPathExpression() {};

    //@}

    // -----------------------------------------------------------------------

    // Virtual DOMDocument interface

    // -----------------------------------------------------------------------

    /** @name Functions introduced in DOM Level 3 */

    //@{  

    /**

     * Evaluates this XPath expression and returns a result.

     * @param contextNode of type <code>DOMNode</code> The context is context

     * node for the evaluation of this XPath expression.

     * If the XPathEvaluator was obtained by casting the Document then this must 

     * be owned by the same document and must be a <code>DOMDocument</code>, <code>DOMElement</code>, 

     * <code>DOMAttribute</code>, <code>DOMText</code>, <code>DOMCDATASection</code>, 

     * <code>DOMComment</code>, <code>DOMProcessingInstruction</code>, or 

     * <code>XPathNamespace</code>. If the context node is a <code>DOMText</code> or a 

     * <code>DOMCDATASection</code>, then the context is interpreted as the whole logical

     * text node as seen by XPath, unless the node is empty in which case it may not

     * serve as the XPath context.

     * @param type of type unsigned short If a specific type is specified, then the result

     * will be coerced to return the specified type relying on XPath conversions and fail 

     * if the desired coercion is not possible. This must be one of the type codes of <code>XPathResult</code>.

     * @param result of type void* The result specifies a specific result object which

     * may be reused and returned by this method. If this is specified as nullor the 

     * implementation does not reuse the specified result, a new result object will be constructed

     * and returned.

     * For XPath 1.0 results, this object will be of type <code>XPathResult</code>.

     * @return void* The result of the evaluation of the XPath expression.

     * For XPath 1.0 results, this object will be of type <code>XPathResult</code>.

     * @exception <code>XPathException</code>

     * TYPE_ERR: Raised if the result cannot be converted to return the specified type.

     * @exception <code>DOMException</code>

     * WRONG_DOCUMENT_ERR: The <code>DOMNode</code> is from a document that is not supported by 

     * the <code>XPathEvaluator</code> that created this <code>DOMXPathExpression</code>.

     * NOT_SUPPORTED_ERR: The Node is not a type permitted as an XPath context node or the 

     * request type is not permitted by this <code>DOMXPathExpression</code>.

     */

    virtual void*          evaluate(DOMNode *contextNode, unsigned short type, void* result) const = 0;

    //@}

};

XERCES_CPP_NAMESPACE_END

#endif