source: NonGTP/Xerces/xerces/include/xercesc/util/RefHashTableOf.hpp @ 358

/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed 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.
 */

/*
 * $Log: RefHashTableOf.hpp,v $
 * Revision 1.15  2004/09/08 13:56:23  peiyongz
 * Apache License Version 2.0
 *
 * Revision 1.14  2004/03/01 15:03:08  peiyongz
 * new getter: getHashModulus
 *
 * Revision 1.13  2004/01/29 11:48:46  cargilld
 * Code cleanup changes to get rid of various compiler diagnostic messages.
 *
 * Revision 1.12  2003/12/17 00:18:35  cargilld
 * Update to memory management so that the static memory manager (one used to call Initialize) is only for static data.
 *
 * Revision 1.11  2003/10/20 11:45:06  gareth
 * Made enumerators inherit from XMemory.
 *
 * Revision 1.10  2003/05/18 14:02:05  knoaman
 * Memory manager implementation: pass per instance manager.
 *
 * Revision 1.9  2003/05/16 21:36:59  knoaman
 * Memory manager implementation: Modify constructors to pass in the memory manager.
 *
 * Revision 1.8  2003/05/15 19:04:35  knoaman
 * Partial implementation of the configurable memory manager.
 *
 * Revision 1.7  2003/05/15 10:37:08  gareth
 * Optimization. We now resize the hash when appropriate. Patch by Nathan Codding.
 *
 * Revision 1.6  2002/11/04 15:22:04  tng
 * C++ Namespace Support.
 *
 * Revision 1.5  2002/08/21 17:45:00  tng
 * [Bug 7087] compiler warnings when using gcc.
 *
 * Revision 1.4  2002/07/11 18:49:53  knoaman
 * Add setAdoptElements method.
 * Rename removeBucketElemSafe to orphanKey.
 *
 * Revision 1.3  2002/07/04 15:24:57  tng
 * DOM L3: add transferElement and removeBucketElemSafe for use in DOMDocument::renameNode.
 *
 * Revision 1.2  2002/06/12 17:14:03  tng
 * Add function cleanup, reinitialize and nextElementKey for ease of use.
 *
 * Revision 1.1.1.1  2002/02/01 22:22:12  peiyongz
 * sane_include
 *
 * Revision 1.9  2001/06/04 13:45:04  tng
 * The "hash" argument clashes with STL hash.  Fixed by Pei Yong Zhang.
 *
 * Revision 1.8  2000/07/07 22:16:51  jpolast
 * remove old put(value) function.  use put(key,value) instead.
 *
 * Revision 1.7  2000/06/29 18:27:09  jpolast
 * bug fix for passing hasher class references to constructor
 *
 * Revision 1.6  2000/06/27 22:11:12  jpolast
 * added more general functionality to hashtables.
 * able to specify which hasher to use.
 * default: HashXMLCh [hashes XMLCh* strings]
 *
 * future todo: make hasher class references static so only
 * one instance of a hasher is ever created.
 *
 * Revision 1.5  2000/03/02 19:54:44  roddey
 * This checkin includes many changes done while waiting for the
 * 1.1.0 code to be finished. I can't list them all here, but a list is
 * available elsewhere.
 *
 * Revision 1.4  2000/02/24 20:05:25  abagchi
 * Swat for removing Log from API docs
 *
 * Revision 1.3  2000/02/06 07:48:03  rahulj
 * Year 2K copyright swat.
 *
 * Revision 1.2  1999/12/18 00:18:10  roddey
 * More changes to support the new, completely orthagonal support for
 * intrinsic encodings.
 *
 * Revision 1.1.1.1  1999/11/09 01:05:01  twl
 * Initial checkin
 *
 * Revision 1.2  1999/11/08 20:45:12  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */


#if !defined(REFHASHTABLEOF_HPP)
#define REFHASHTABLEOF_HPP


#include <xercesc/util/HashBase.hpp>
#include <xercesc/util/IllegalArgumentException.hpp>
#include <xercesc/util/NoSuchElementException.hpp>
#include <xercesc/util/RuntimeException.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/HashXMLCh.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xercesc/framework/MemoryManager.hpp>

XERCES_CPP_NAMESPACE_BEGIN

//
//  Forward declare the enumerator so he can be our friend. Can you say
//  friend? Sure...
//
template <class TVal> class RefHashTableOfEnumerator;
template <class TVal> struct RefHashTableBucketElem;


//
//  This should really be a nested class, but some of the compilers we
//  have to support cannot deal with that!
//
template <class TVal> struct RefHashTableBucketElem : public XMemory
{
    RefHashTableBucketElem(void* key, TVal* const value, RefHashTableBucketElem<TVal>* next)
                : fData(value), fNext(next), fKey(key)
        {
        }

    RefHashTableBucketElem(){};

    TVal*                           fData;
    RefHashTableBucketElem<TVal>*   fNext;
        void*                                                   fKey;

private:
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    RefHashTableBucketElem(const RefHashTableBucketElem<TVal>&);
    RefHashTableBucketElem<TVal>& operator=(const RefHashTableBucketElem<TVal>&);
};


template <class TVal> class RefHashTableOf : public XMemory
{
public:
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
        // backwards compatability - default hasher is HashXMLCh
    RefHashTableOf
    (
        const unsigned int modulus
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );
        // backwards compatability - default hasher is HashXMLCh
    RefHashTableOf
    (
        const unsigned int modulus
        , const bool adoptElems
        , MemoryManager* const manager =  XMLPlatformUtils::fgMemoryManager
    );
        // if a hash function is passed in, it will be deleted when the hashtable is deleted.
        // use a new instance of the hasher class for each hashtable, otherwise one hashtable
        // may delete the hasher of a different hashtable if both use the same hasher.
    RefHashTableOf
    (
        const unsigned int modulus
        , const bool adoptElems
        , HashBase* hashBase
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );
    ~RefHashTableOf();


    // -----------------------------------------------------------------------
    //  Element management
    // -----------------------------------------------------------------------
    bool isEmpty() const;
    bool containsKey(const void* const key) const;
    void removeKey(const void* const key);
    void removeAll();
    void cleanup();
    void reinitialize(HashBase* hashBase);
    void transferElement(const void* const key1, void* key2);
    TVal* orphanKey(const void* const key);

    // -----------------------------------------------------------------------
    //  Getters
    // -----------------------------------------------------------------------
    TVal* get(const void* const key);
    const TVal* get(const void* const key) const;
    MemoryManager* getMemoryManager() const;   
    unsigned int   getHashModulus()   const;

    // -----------------------------------------------------------------------
    //  Setters
    // -----------------------------------------------------------------------
    void setAdoptElements(const bool aValue);


    // -----------------------------------------------------------------------
    //  Putters
    // -----------------------------------------------------------------------
        void put(void* key, TVal* const valueToAdopt);


private :
    // -----------------------------------------------------------------------
    //  Declare our friends
    // -----------------------------------------------------------------------
    friend class RefHashTableOfEnumerator<TVal>;

private:
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    RefHashTableOf(const RefHashTableOf<TVal>&);
    RefHashTableOf<TVal>& operator=(const RefHashTableOf<TVal>&);

    // -----------------------------------------------------------------------
    //  Private methods
    // -----------------------------------------------------------------------
    RefHashTableBucketElem<TVal>* findBucketElem(const void* const key, unsigned int& hashVal);
    const RefHashTableBucketElem<TVal>* findBucketElem(const void* const key, unsigned int& hashVal) const;
    void removeBucketElem(const void* const key, unsigned int& hashVal);
    void initialize(const unsigned int modulus);
    void rehash();


    // -----------------------------------------------------------------------
    //  Data members
    //
    //  fAdoptedElems
    //      Indicates whether the values added are adopted or just referenced.
    //      If adopted, then they are deleted when they are removed from the
    //      hash table.
    //
    //  fBucketList
    //      This is the array that contains the heads of all of the list
    //      buckets, one for each possible hash value.
    //
    //  fHashModulus
    //      The modulus used for this hash table, to hash the keys. This is
    //      also the number of elements in the bucket list.
        //
        //  fHash
        //      The hasher for the key data type.
    // -----------------------------------------------------------------------
    MemoryManager*                 fMemoryManager;
    bool                           fAdoptedElems;
    RefHashTableBucketElem<TVal>** fBucketList;
    unsigned int                   fHashModulus;
    unsigned int                   fInitialModulus;
    unsigned int                   fCount;
    HashBase*                      fHash;
};



//
//  An enumerator for a value array. It derives from the basic enumerator
//  class, so that value vectors can be generically enumerated.
//
template <class TVal> class RefHashTableOfEnumerator : public XMLEnumerator<TVal>, public XMemory
{
public :
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    RefHashTableOfEnumerator(RefHashTableOf<TVal>* const toEnum
        , const bool adopt = false
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    virtual ~RefHashTableOfEnumerator();

    RefHashTableOfEnumerator(const RefHashTableOfEnumerator<TVal>&);
    // -----------------------------------------------------------------------
    //  Enum interface
    // -----------------------------------------------------------------------
    bool hasMoreElements() const;
    TVal& nextElement();
    void Reset();

    // -----------------------------------------------------------------------
    //  New interface specific for key used in RefHashable
    // -----------------------------------------------------------------------
    void* nextElementKey();

private :
    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    RefHashTableOfEnumerator<TVal>& operator=(const RefHashTableOfEnumerator<TVal>&);

    // -----------------------------------------------------------------------
    //  Private methods
    // -----------------------------------------------------------------------
    void findNext();


    // -----------------------------------------------------------------------
    //  Data Members
    //
    //  fAdopted
    //      Indicates whether we have adopted the passed vector. If so then
    //      we delete the vector when we are destroyed.
    //
    //  fCurElem
    //      This is the current bucket bucket element that we are on.
    //
    //  fCurHash
    //      The is the current hash buck that we are working on. Once we hit
    //      the end of the bucket that fCurElem is in, then we have to start
    //      working this one up to the next non-empty bucket.
    //
    //  fToEnum
    //      The value array being enumerated.
    // -----------------------------------------------------------------------
    bool                                  fAdopted;
    RefHashTableBucketElem<TVal>*         fCurElem;
    unsigned int                          fCurHash;
    RefHashTableOf<TVal>*                 fToEnum;
    MemoryManager* const                  fMemoryManager;
};

XERCES_CPP_NAMESPACE_END

#if !defined(XERCES_TMPLSINC)
#include <xercesc/util/RefHashTableOf.c>
#endif

#endif