NameIdPool.hpp
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- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2000 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.
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- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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- * 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) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Log: NameIdPool.hpp,v $
- * Revision 1.6 2003/05/16 06:01:52 knoaman
- * Partial implementation of the configurable memory manager.
- *
- * Revision 1.5 2003/05/15 19:04:35 knoaman
- * Partial implementation of the configurable memory manager.
- *
- * Revision 1.4 2003/03/07 18:11:54 tng
- * Return a reference instead of void for operator=
- *
- * Revision 1.3 2002/12/04 02:32:43 knoaman
- * #include cleanup.
- *
- * Revision 1.2 2002/11/04 15:22:04 tng
- * C++ Namespace Support.
- *
- * Revision 1.1.1.1 2002/02/01 22:22:11 peiyongz
- * sane_include
- *
- * Revision 1.6 2000/09/09 00:11:48 andyh
- * Virtual Destructor Patch, submitted by Kirk Wylie
- *
- * Revision 1.5 2000/07/19 18:47:26 andyh
- * More Macintosh port tweaks, submitted by James Berry.
- *
- * Revision 1.4 2000/03/02 19:54:42 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 1.3 2000/02/24 20:05:24 abagchi
- * Swat for removing Log from API docs
- *
- * Revision 1.2 2000/02/06 07:48:02 rahulj
- * Year 2K copyright swat.
- *
- * Revision 1.1.1.1 1999/11/09 01:04:48 twl
- * Initial checkin
- *
- * Revision 1.3 1999/11/08 20:45:10 rahul
- * Swat for adding in Product name and CVS comment log variable.
- *
- */
- #if !defined(NAMEIDPOOL_HPP)
- #define NAMEIDPOOL_HPP
- #include <xercesc/util/XMemory.hpp>
- #include <xercesc/util/XMLString.hpp>
- #include <xercesc/util/PlatformUtils.hpp>
- XERCES_CPP_NAMESPACE_BEGIN
- //
- // Forward declare the enumerator so he can be our friend. Can you say
- // friend? Sure...
- //
- template <class TElem> class NameIdPoolEnumerator;
- //
- // This class is provided to serve as the basis of many of the pools that
- // are used by the scanner and validators. They often need to be able to
- // store objects in such a way that they can be quickly accessed by the
- // name field of the object, and such that each element added is assigned
- // a unique id via which it can be accessed almost instantly.
- //
- // Object names are enforced as being unique, since that's what all these
- // pools require. So its effectively a hash table in conjunction with an
- // array of references into the hash table by id. Ids are assigned such that
- // id N can be used to get the Nth element from the array of references.
- // This provides very fast access by id.
- //
- // The way these pools are used, elements are never removed except when the
- // whole thing is flushed. This makes it very easy to maintain the two
- // access methods in sync.
- //
- // For efficiency reasons, the id refererence array is never flushed until
- // the dtor. This way, it does not have to be regrown every time its reused.
- //
- // All elements are assumed to be owned by the pool!
- //
- // We have to have a bucket element structure to use to maintain the linked
- // lists for each bucket. Because some of the compilers we have to support
- // are totally brain dead, it cannot be a nested class as it should be.
- //
- template <class TElem> struct NameIdPoolBucketElem : public XMemory
- {
- public :
- NameIdPoolBucketElem
- (
- TElem* const value
- , NameIdPoolBucketElem<TElem>* const next
- );
- ~NameIdPoolBucketElem();
- TElem* fData;
- NameIdPoolBucketElem<TElem>* fNext;
- };
- template <class TElem> class NameIdPool : public XMemory
- {
- public :
- // -----------------------------------------------------------------------
- // Contructors and Destructor
- // -----------------------------------------------------------------------
- NameIdPool
- (
- const unsigned int hashModulus
- , const unsigned int initSize = 128
- , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
- );
- ~NameIdPool();
- // -----------------------------------------------------------------------
- // Element management
- // -----------------------------------------------------------------------
- bool containsKey(const XMLCh* const key) const;
- void removeAll();
- // -----------------------------------------------------------------------
- // Getters
- // -----------------------------------------------------------------------
- TElem* getByKey(const XMLCh* const key);
- const TElem* getByKey(const XMLCh* const key) const;
- TElem* getById(const unsigned elemId);
- const TElem* getById(const unsigned elemId) const;
- // -----------------------------------------------------------------------
- // Putters
- //
- // Dups are not allowed and cause an IllegalArgumentException. The id
- // of the new element is returned.
- // -----------------------------------------------------------------------
- unsigned int put(TElem* const valueToAdopt);
- protected :
- // -----------------------------------------------------------------------
- // Declare the enumerator our friend so he can see our members
- // -----------------------------------------------------------------------
- friend class NameIdPoolEnumerator<TElem>;
- private :
- // -----------------------------------------------------------------------
- // Unused constructors and operators
- // -----------------------------------------------------------------------
- NameIdPool(const NameIdPool<TElem>&);
- NameIdPool<TElem>& operator=(const NameIdPool<TElem>&);
- // -----------------------------------------------------------------------
- // Private helper methods
- // -----------------------------------------------------------------------
- NameIdPoolBucketElem<TElem>* findBucketElem
- (
- const XMLCh* const key
- , unsigned int& hashVal
- );
- const NameIdPoolBucketElem<TElem>* findBucketElem
- (
- const XMLCh* const key
- , unsigned int& hashVal
- ) const;
- // -----------------------------------------------------------------------
- // Data members
- //
- // fBucketList
- // This is the array that contains the heads of all of the list
- // buckets, one for each possible hash value.
- //
- // 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.
- //
- // fHashModulus
- // This is the modulus to use in this pool. The fBucketList array
- // is of this size. It should be a prime number.
- // -----------------------------------------------------------------------
- MemoryManager* fMemoryManager;
- NameIdPoolBucketElem<TElem>** fBucketList;
- TElem** fIdPtrs;
- unsigned int fIdPtrsCount;
- unsigned int fIdCounter;
- unsigned int fHashModulus;
- };
- //
- // An enumerator for a name id pool. It derives from the basic enumerator
- // class, so that pools can be generically enumerated.
- //
- template <class TElem> class NameIdPoolEnumerator : public XMLEnumerator<TElem>
- {
- public :
- // -----------------------------------------------------------------------
- // Constructors and Destructor
- // -----------------------------------------------------------------------
- NameIdPoolEnumerator
- (
- NameIdPool<TElem>* const toEnum
- );
- NameIdPoolEnumerator
- (
- const NameIdPoolEnumerator<TElem>& toCopy
- );
- virtual ~NameIdPoolEnumerator();
- // -----------------------------------------------------------------------
- // Public operators
- // -----------------------------------------------------------------------
- NameIdPoolEnumerator<TElem>& operator=
- (
- const NameIdPoolEnumerator<TElem>& toAssign
- );
- // -----------------------------------------------------------------------
- // Enum interface
- // -----------------------------------------------------------------------
- bool hasMoreElements() const;
- TElem& nextElement();
- void Reset();
- private :
- // -----------------------------------------------------------------------
- // Data Members
- //
- // fCurIndex
- // This is the current index into the pool's id mapping array. This
- // is now we enumerate it.
- //
- // fToEnum
- // The name id pool that is being enumerated.
- // -----------------------------------------------------------------------
- unsigned int fCurIndex;
- NameIdPool<TElem>* fToEnum;
- };
- XERCES_CPP_NAMESPACE_END
- #if !defined(XERCES_TMPLSINC)
- #include <xercesc/util/NameIdPool.c>
- #endif
- #endif