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

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


namespace XALAN_CPP_NAMESPACE {


class TracerEvent;
class SelectionEvent;
class GenerateEvent;


class XALAN_XSLT_EXPORT TraceListener
{
public:

    TraceListener();

    virtual
    ~TraceListener();

    /**
     * Method that is called when a trace event occurs. The method is blocking.
     * It must return before processing continues.
     *
     * @param ev trace event
     */
    virtual void
    trace(const TracerEvent&    ev) = 0;

    /**
     * Method that is called just after the formatter listener is called.
     *
     * @param ev generate event
     */
    virtual void
    selected(const SelectionEvent&  ev) = 0;

    /**
     * Method that is called just after the formatter listener is called.
     *
     * @param ev generate event
     */
    virtual void
    generated(const GenerateEvent&  ev) = 0;

    struct TraceListenerTraceFunctor
    {
        TraceListenerTraceFunctor(const TracerEvent&    theEvent) :
            m_event(theEvent)
        {
        }

        void
        operator()(TraceListener*   theListener) const
        {
            theListener->trace(m_event);
        }

        const TracerEvent&  m_event;
    };

    struct TraceListenerSelectFunctor
    {
        TraceListenerSelectFunctor(const SelectionEvent&        theEvent) :
            m_event(theEvent)
        {
        }

        void
        operator()(TraceListener*   theListener) const
        {
            theListener->selected(m_event);
        }

        const SelectionEvent&   m_event;
    };

    struct TraceListenerGenerateFunctor
    {
        TraceListenerGenerateFunctor(const GenerateEvent&   theEvent) :
            m_event(theEvent)
        {
        }

        void
        operator()(TraceListener*   theListener) const
        {
            theListener->generated(m_event);
        }

        const GenerateEvent&    m_event;
    };

};


}


#endif //XALAN_TraceListener_HEADER_GUARD