DOMDeepNodeListPool.hpp

/*
 * 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.
 */

/*
 * $Id$
 */

//
//  This file is part of the internal implementation of the C++ XML DOM.
//  It should NOT be included or used directly by application programs.
//
//  Applications should include the file <xercesc/dom/DOM.hpp> for the entire
//  DOM API, or xercesc/dom/DOM*.hpp for individual DOM classes, where the class
//  name is substituded for the *.
//

#if !defined(XERCESC_INCLUDE_GUARD_DOMDEEPNODELISTPOOL_HPP)
#define XERCESC_INCLUDE_GUARD_DOMDEEPNODELISTPOOL_HPP


#include <xercesc/util/Hashers.hpp>
#include <xercesc/util/IllegalArgumentException.hpp>
#include <xercesc/util/NoSuchElementException.hpp>
#include <xercesc/util/RuntimeException.hpp>
#include <xercesc/util/XMLExceptMsgs.hpp>
#include <xercesc/util/XMLEnumerator.hpp>

XERCES_CPP_NAMESPACE_BEGIN

//
//  This should really be a nested class, but some of the compilers we
//  have to support cannot deal with that!
//
template <class TVal>
struct DOMDeepNodeListPoolTableBucketElem : public XMemory
{
    DOMDeepNodeListPoolTableBucketElem
    (
        void* key1
        , XMLCh* key2
        , XMLCh* key3
        , TVal* const value
        , DOMDeepNodeListPoolTableBucketElem<TVal>* next
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    ) :
    fData(value)
    , fNext(next)
    , fKey1(key1)
    , fKey2(0)
    , fKey3(0)
    {
        if (key2)
            fKey2 = XMLString::replicate(key2, manager);

        if (key3)
            fKey3 = XMLString::replicate(key3, manager);
    }

    TVal*                                     fData;
    DOMDeepNodeListPoolTableBucketElem<TVal>* fNext;
    void*                                     fKey1;
    XMLCh*                                    fKey2;
    XMLCh*                                    fKey3;

    ~DOMDeepNodeListPoolTableBucketElem() {};
};


template <class TVal, class THasher = PtrHasher>
class DOMDeepNodeListPool
{
public:
    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    DOMDeepNodeListPool
    (
        const XMLSize_t modulus
      , const XMLSize_t initSize = 128
    );

    DOMDeepNodeListPool
    (
        const XMLSize_t modulus
      , const bool adoptElems
      , const XMLSize_t initSize = 128
    );

    DOMDeepNodeListPool
    (
         const XMLSize_t modulus
       , const bool adoptElems
       , const THasher& hasher
       , const XMLSize_t initSize = 128
    );

    ~DOMDeepNodeListPool();

    // -----------------------------------------------------------------------
    //  Element management
    // -----------------------------------------------------------------------
    bool isEmpty() const;
    bool containsKey(const void* const key1, const XMLCh* const key2, const XMLCh* const key3) const;
    void removeAll();
    void cleanup();


    // -----------------------------------------------------------------------
    //  Getters
    // -----------------------------------------------------------------------
    TVal* getByKey(const void* const key1, const XMLCh* const key2, const XMLCh* const key3);
    const TVal* getByKey(const void* const key1, const XMLCh* const key2, const XMLCh* const key3) const;

    TVal* getById(const XMLSize_t elemId);
    const TVal* getById(const XMLSize_t elemId) const;

    // -----------------------------------------------------------------------
    //  Putters
    // -----------------------------------------------------------------------
    XMLSize_t put(void* key1, XMLCh* key2, XMLCh* key3, TVal* const valueToAdopt);

private:

    // -----------------------------------------------------------------------
    //  Private methods
    // -----------------------------------------------------------------------
    DOMDeepNodeListPoolTableBucketElem<TVal>* findBucketElem(const void* const key1, const XMLCh* const key2, const XMLCh* const key3, XMLSize_t& hashVal);
    const DOMDeepNodeListPoolTableBucketElem<TVal>* findBucketElem(const void* const key1, const XMLCh* const key2, const XMLCh* const key3, XMLSize_t& hashVal) const;
    void initialize(const XMLSize_t modulus);

    // -----------------------------------------------------------------------
    // Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    DOMDeepNodeListPool(const DOMDeepNodeListPool<TVal, THasher> &);
    DOMDeepNodeListPool<TVal, THasher> & operator = (const DOMDeepNodeListPool<TVal, THasher> &);

    // -----------------------------------------------------------------------
    //  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 key1 data type.
    //
    //  fIdPtrs
    //  fIdPtrsCount
    //      This is the array of pointers to the bucket elements in order of
    //      their assigned ids. So taking id N and referencing this array
    //      gives you the element with that id. The count field indicates
    //      the current size of this list. When fIdCounter+1 reaches this
    //      value the list must be expanded.
    //
    //  fIdCounter
    //      This is used to give out unique ids to added elements. It starts
    //      at zero (which means empty), and is bumped up for each newly added
    //      element. So the first element is 1, the next is 2, etc... This
    //      means that this value is set to the top index of the fIdPtrs array.
    // -----------------------------------------------------------------------
    bool                                       fAdoptedElems;
    DOMDeepNodeListPoolTableBucketElem<TVal>** fBucketList;
    XMLSize_t                                  fHashModulus;
    TVal**                                     fIdPtrs;
    XMLSize_t                                  fIdPtrsCount;
    XMLSize_t                                  fIdCounter;
    MemoryManager*                             fMemoryManager;
    THasher                                    fHasher;
};

XERCES_CPP_NAMESPACE_END

#if !defined(XERCES_TMPLSINC)
#include <xercesc/dom/impl/DOMDeepNodeListPool.c>
#endif

#endif