/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/



#ifndef _PATHEXPRESSION_HXX
#define _PATHEXPRESSION_HXX


// include for parent class
#include "computedexpression.hxx"

// includes for member variables
#include <vector>

// forward declaractions
namespace com { namespace sun { namespace star
{ 
    namespace xml { namespace dom 
    {
        class XNodeList; 
        namespace events { class XEventListener; }
    } }
} } }



namespace xforms
{

/** PathExpression represents an XPath Expression and caches results */
class PathExpression : public ComputedExpression
{
public:
    typedef std::vector<com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> > NodeVector_t;

private:
    /// the node-list result from the last bind (cached from mxResult)
    NodeVector_t maNodes;

protected:
    /// get expression for evaluation
    const rtl::OUString _getExpressionForEvaluation() const;


public:
    PathExpression();
    ~PathExpression();

    /// set the expression string
    /// (overridden to do remove old listeners)
    /// (also defines simple expressions)
    void setExpression( const rtl::OUString& rExpression );


    /// evaluate the expression relative to the content node.
    bool evaluate( const xforms::EvaluationContext& rContext );


    // get the result of this expression as node/node list/...
    com::sun::star::uno::Reference<com::sun::star::xml::dom::XNode> getNode() const;
    const NodeVector_t getNodeList() const;
    com::sun::star::uno::Reference<com::sun::star::xml::dom::XNodeList> getXNodeList() const;

};

} // namespace xforms

#endif