/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache\@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/**
 * $Log$
 * Revision 1.1  1999/11/09 01:07:46  twl
 * Initial revision
 *
 * Revision 1.3  1999/11/08 20:45:01  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


#ifndef LOCATOR_HPP
#define LOCATOR_HPP

#include <util/XML4CDefs.hpp>
/**
  * Interface for associating a SAX event with a document location.
  *
  * <p>If a SAX parser provides location information to the SAX
  * application, it does so by implementing this interface and then
  * passing an instance to the application using the document
  * handler's setDocumentLocator method.  The application can use the
  * object to obtain the location of any other document handler event
  * in the XML source document.</p>
  *
  * <p>Note that the results returned by the object will be valid only
  * during the scope of each document handler method: the application
  * will receive unpredictable results if it attempts to use the
  * locator at any other time.</p>
  *
  * <p>SAX parsers are not required to supply a locator, but they are
  * very strong encouraged to do so.  If the parser supplies a
  * locator, it must do so before reporting any other document events.
  * If no locator has been set by the time the application receives
  * the startDocument event, the application should assume that a
  * locator is not available.</p>
  *
  * $Log$
  * Revision 1.1  1999/11/09 01:07:46  twl
  * Initial revision
  *
  * Revision 1.3  1999/11/08 20:45:01  rahul
  * Swat for adding in Product name and CVS comment log variable.
  *
  * @see DocumentHandler#setDocumentLocator 
  */

class SAX_EXPORT Locator
{
public:

    /** @name Constructors and Destructor */
    //@{
    /** Default constructor */
    Locator()
    {
    }

    /** Destructor */
    virtual ~Locator()
    {
    }

    //@}

    /** @name The locator interface */
    //@{
  /**
    * Return the public identifier for the current document event.
    * <p>This will be the public identifier
    * @return A string containing the public identifier, or
    *         null if none is available.
    * @see #getSystemId
    */
    virtual const XMLCh* getPublicId() const = 0;

  /**
    * Return the system identifier for the current document event.
    *
    * <p>If the system identifier is a URL, the parser must resolve it
    * fully before passing it to the application.</p>
    *
    * @return A string containing the system identifier, or null
    *         if none is available.
    * @see #getPublicId
    */
    virtual const XMLCh* getSystemId() const = 0;

  /**
    * Return the line number where the current document event ends.
    * Note that this is the line position of the first character
    * after the text associated with the document event.
    * @return The line number, or -1 if none is available.
    * @see #getColumnNumber
    */
    virtual int getLineNumber() const = 0;

  /**
    * Return the column number where the current document event ends.
    * Note that this is the column number of the first
    * character after the text associated with the document
    * event.  The first column in a line is position 1.
    * @return The column number, or -1 if none is available.
    * @see #getLineNumber
    */
    virtual int getColumnNumber() const = 0;
    //@}

private :
    /** @name Unimplemented constructors and operators */
    //@{
    /** Copy constructor */
    Locator(const Locator&);

    /** Assignment operator */
    void operator=(const Locator&);
    //@}
};

#endif