source: NonGTP/Xerces/xercesc/util/HashBase.hpp @ 188

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 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.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    distribution.
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 *    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,
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 * ====================================================================
 *
 * 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/>.
 */

#if !defined(HASHBASE_HPP)
#define HASHBASE_HPP

#include <xercesc/util/XMemory.hpp>
#include <xercesc/util/PlatformUtils.hpp>

XERCES_CPP_NAMESPACE_BEGIN

/**
 * The <code>HashBase</code> interface is the general outline of a hasher.
 * Hashers are used in <code>RefHashTableOf</code> hashtables to hash any
 * type of key.  An examples is the <code>HashXMLCh</code> class which is
 * designed to produce hash values for XMLCh* strings.  Any hasher inheriting
 * from <code>HashBase</code> may be specified when the RefHashTableOf hashtable is constructed.
 */
class XMLUTIL_EXPORT HashBase : public XMemory
{

public:
        
        /**
      * Returns a hash value based on the key
      *
      * @param key the key to be hashed
          * @param mod the modulus the hasher should use
      */
        virtual unsigned int getHashVal(const void *const key, unsigned int mod
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager) = 0;

        /**
      * Compares two keys and determines if they are semantically equal
      *
      * @param key1 the first key to be compared
          * @param key2 the second key to be compared
          *
          * @return true if they are equal
      */
        virtual bool equals(const void *const key1, const void *const key2) = 0;

    virtual ~HashBase() {};

    HashBase() {};

private:
        // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    HashBase(const HashBase&);
    HashBase& operator=(const HashBase&);    
};

XERCES_CPP_NAMESPACE_END

#endif