/*

 * 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(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