/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 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) 2001, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
 * $Id: EncodingValidator.hpp,v 1.3 2003/03/04 21:11:12 knoaman Exp $
 */

#if !defined(ENCODINGVALIDATOR_HPP)
#define ENCODINGVALIDATOR_HPP

// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/util/ValueHashTableOf.hpp>

XERCES_CPP_NAMESPACE_BEGIN

/**
  * A singleton class that checks whether an encoding name is a valid IANA
  * encoding
  */

class XMLUTIL_EXPORT EncodingValidator {

public:
    // -----------------------------------------------------------------------
    //  Validation methods
    // -----------------------------------------------------------------------
    bool isValidEncoding(const XMLCh* const encName);

    // -----------------------------------------------------------------------
    //  Instance methods
    // -----------------------------------------------------------------------
	static EncodingValidator* instance();

	// -----------------------------------------------------------------------
    //  Notification that lazy data has been deleted
    // -----------------------------------------------------------------------
	static void reinitInstance();

private:
    // -----------------------------------------------------------------------
    //  Constructor and destructors
    // -----------------------------------------------------------------------
    EncodingValidator();
    ~EncodingValidator();

    // -----------------------------------------------------------------------
    //  Private Helpers methods
    // -----------------------------------------------------------------------
    /*
     *  Initializes the registry with a set of valid IANA encoding names
     */
     void initializeRegistry();

    // -----------------------------------------------------------------------
    //  Private data members
    //
    //  fEncodingRegistry
    //      Contains a set of IANA encoding names
	//
    //  fInstance
    //      An EncodingValidator singleton instance
    // -----------------------------------------------------------------------
    ValueHashTableOf<bool>*   fEncodingRegistry;
    static EncodingValidator* fInstance;
};

XERCES_CPP_NAMESPACE_END

#endif

/**
  *	End file EncodingValidator.hpp
  */