[188] | 1 | /*
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| 2 | * The Apache Software License, Version 1.1
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| 3 | *
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| 4 | * Copyright (c) 1999-2000 The Apache Software Foundation. All rights
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| 5 | * reserved.
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| 6 | *
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| 7 | * Redistribution and use in source and binary forms, with or without
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| 8 | * modification, are permitted provided that the following conditions
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| 9 | * are met:
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| 10 | *
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | *
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| 14 | * 2. Redistributions in binary form must reproduce the above copyright
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| 15 | * notice, this list of conditions and the following disclaimer in
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| 16 | * the documentation and/or other materials provided with the
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| 17 | * distribution.
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| 18 | *
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| 19 | * 3. The end-user documentation included with the redistribution,
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| 20 | * if any, must include the following acknowledgment:
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| 21 | * "This product includes software developed by the
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| 22 | * Apache Software Foundation (http://www.apache.org/)."
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| 23 | * Alternately, this acknowledgment may appear in the software itself,
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| 24 | * if and wherever such third-party acknowledgments normally appear.
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| 25 | *
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| 26 | * 4. The names "Xerces" and "Apache Software Foundation" must
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| 27 | * not be used to endorse or promote products derived from this
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| 28 | * software without prior written permission. For written
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| 29 | * permission, please contact apache\@apache.org.
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| 30 | *
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| 31 | * 5. Products derived from this software may not be called "Apache",
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| 32 | * nor may "Apache" appear in their name, without prior written
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| 33 | * permission of the Apache Software Foundation.
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| 34 | *
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| 35 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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| 36 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 37 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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| 38 | * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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| 39 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 40 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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| 41 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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| 42 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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| 43 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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| 44 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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| 45 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 46 | * SUCH DAMAGE.
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| 47 | * ====================================================================
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| 48 | *
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| 49 | * This software consists of voluntary contributions made by many
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| 50 | * individuals on behalf of the Apache Software Foundation, and was
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| 51 | * originally based on software copyright (c) 1999, International
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| 52 | * Business Machines, Inc., http://www.ibm.com . For more information
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| 53 | * on the Apache Software Foundation, please see
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| 54 | * <http://www.apache.org/>.
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| 55 | */
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| 56 |
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| 57 | /*
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| 58 | * $Log: NameIdPool.hpp,v $
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| 59 | * Revision 1.9 2004/01/29 11:48:46 cargilld
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| 60 | * Code cleanup changes to get rid of various compiler diagnostic messages.
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| 61 | *
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| 62 | * Revision 1.8 2003/12/17 00:18:35 cargilld
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| 63 | * Update to memory management so that the static memory manager (one used to call Initialize) is only for static data.
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| 64 | *
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| 65 | * Revision 1.7 2003/10/29 16:17:48 peiyongz
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| 66 | * size() added
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| 67 | *
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| 68 | * Revision 1.6 2003/05/16 06:01:52 knoaman
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| 69 | * Partial implementation of the configurable memory manager.
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| 70 | *
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| 71 | * Revision 1.5 2003/05/15 19:04:35 knoaman
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| 72 | * Partial implementation of the configurable memory manager.
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| 73 | *
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| 74 | * Revision 1.4 2003/03/07 18:11:54 tng
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| 75 | * Return a reference instead of void for operator=
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| 76 | *
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| 77 | * Revision 1.3 2002/12/04 02:32:43 knoaman
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| 78 | * #include cleanup.
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| 79 | *
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| 80 | * Revision 1.2 2002/11/04 15:22:04 tng
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| 81 | * C++ Namespace Support.
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| 82 | *
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| 83 | * Revision 1.1.1.1 2002/02/01 22:22:11 peiyongz
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| 84 | * sane_include
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| 85 | *
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| 86 | * Revision 1.6 2000/09/09 00:11:48 andyh
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| 87 | * Virtual Destructor Patch, submitted by Kirk Wylie
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| 88 | *
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| 89 | * Revision 1.5 2000/07/19 18:47:26 andyh
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| 90 | * More Macintosh port tweaks, submitted by James Berry.
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| 91 | *
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| 92 | * Revision 1.4 2000/03/02 19:54:42 roddey
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| 93 | * This checkin includes many changes done while waiting for the
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| 94 | * 1.1.0 code to be finished. I can't list them all here, but a list is
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| 95 | * available elsewhere.
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| 96 | *
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| 97 | * Revision 1.3 2000/02/24 20:05:24 abagchi
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| 98 | * Swat for removing Log from API docs
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| 99 | *
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| 100 | * Revision 1.2 2000/02/06 07:48:02 rahulj
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| 101 | * Year 2K copyright swat.
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| 102 | *
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| 103 | * Revision 1.1.1.1 1999/11/09 01:04:48 twl
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| 104 | * Initial checkin
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| 105 | *
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| 106 | * Revision 1.3 1999/11/08 20:45:10 rahul
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| 107 | * Swat for adding in Product name and CVS comment log variable.
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| 108 | *
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| 109 | */
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| 110 |
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| 111 |
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| 112 | #if !defined(NAMEIDPOOL_HPP)
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| 113 | #define NAMEIDPOOL_HPP
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| 114 |
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| 115 | #include <xercesc/util/XMemory.hpp>
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| 116 | #include <xercesc/util/XMLString.hpp>
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| 117 | #include <xercesc/util/PlatformUtils.hpp>
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| 118 |
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| 119 | XERCES_CPP_NAMESPACE_BEGIN
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| 120 |
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| 121 | //
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| 122 | // Forward declare the enumerator so he can be our friend. Can you say
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| 123 | // friend? Sure...
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| 124 | //
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| 125 | template <class TElem> class NameIdPoolEnumerator;
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| 126 |
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| 127 |
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| 128 | //
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| 129 | // This class is provided to serve as the basis of many of the pools that
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| 130 | // are used by the scanner and validators. They often need to be able to
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| 131 | // store objects in such a way that they can be quickly accessed by the
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| 132 | // name field of the object, and such that each element added is assigned
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| 133 | // a unique id via which it can be accessed almost instantly.
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| 134 | //
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| 135 | // Object names are enforced as being unique, since that's what all these
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| 136 | // pools require. So its effectively a hash table in conjunction with an
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| 137 | // array of references into the hash table by id. Ids are assigned such that
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| 138 | // id N can be used to get the Nth element from the array of references.
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| 139 | // This provides very fast access by id.
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| 140 | //
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| 141 | // The way these pools are used, elements are never removed except when the
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| 142 | // whole thing is flushed. This makes it very easy to maintain the two
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| 143 | // access methods in sync.
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| 144 | //
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| 145 | // For efficiency reasons, the id refererence array is never flushed until
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| 146 | // the dtor. This way, it does not have to be regrown every time its reused.
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| 147 | //
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| 148 | // All elements are assumed to be owned by the pool!
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| 149 | //
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| 150 | // We have to have a bucket element structure to use to maintain the linked
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| 151 | // lists for each bucket. Because some of the compilers we have to support
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| 152 | // are totally brain dead, it cannot be a nested class as it should be.
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| 153 | //
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| 154 | template <class TElem> struct NameIdPoolBucketElem : public XMemory
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| 155 | {
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| 156 | public :
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| 157 | NameIdPoolBucketElem
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| 158 | (
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| 159 | TElem* const value
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| 160 | , NameIdPoolBucketElem<TElem>* const next
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| 161 | );
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| 162 | ~NameIdPoolBucketElem();
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| 163 |
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| 164 | TElem* fData;
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| 165 | NameIdPoolBucketElem<TElem>* fNext;
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| 166 | private:
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| 167 | // -----------------------------------------------------------------------
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| 168 | // Unimplemented constructors and operators
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| 169 | // -----------------------------------------------------------------------
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| 170 | NameIdPoolBucketElem(const NameIdPoolBucketElem<TElem>&);
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| 171 | NameIdPoolBucketElem<TElem>& operator=(const NameIdPoolBucketElem<TElem>&);
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| 172 | };
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| 173 |
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| 174 |
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| 175 | template <class TElem> class NameIdPool : public XMemory
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| 176 | {
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| 177 | public :
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| 178 | // -----------------------------------------------------------------------
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| 179 | // Contructors and Destructor
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| 180 | // -----------------------------------------------------------------------
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| 181 | NameIdPool
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| 182 | (
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| 183 | const unsigned int hashModulus
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| 184 | , const unsigned int initSize = 128
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| 185 | , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
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| 186 | );
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| 187 |
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| 188 | ~NameIdPool();
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| 189 |
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| 190 |
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| 191 | // -----------------------------------------------------------------------
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| 192 | // Element management
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| 193 | // -----------------------------------------------------------------------
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| 194 | bool containsKey(const XMLCh* const key) const;
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| 195 | void removeAll();
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| 196 |
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| 197 |
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| 198 | // -----------------------------------------------------------------------
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| 199 | // Getters
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| 200 | // -----------------------------------------------------------------------
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| 201 | TElem* getByKey(const XMLCh* const key);
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| 202 | const TElem* getByKey(const XMLCh* const key) const;
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| 203 | TElem* getById(const unsigned elemId);
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| 204 | const TElem* getById(const unsigned elemId) const;
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| 205 |
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| 206 | MemoryManager* getMemoryManager() const;
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| 207 | // -----------------------------------------------------------------------
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| 208 | // Putters
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| 209 | //
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| 210 | // Dups are not allowed and cause an IllegalArgumentException. The id
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| 211 | // of the new element is returned.
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| 212 | // -----------------------------------------------------------------------
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| 213 | unsigned int put(TElem* const valueToAdopt);
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| 214 |
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| 215 |
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| 216 | protected :
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| 217 | // -----------------------------------------------------------------------
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| 218 | // Declare the enumerator our friend so he can see our members
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| 219 | // -----------------------------------------------------------------------
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| 220 | friend class NameIdPoolEnumerator<TElem>;
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| 221 |
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| 222 |
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| 223 | private :
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| 224 | // -----------------------------------------------------------------------
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| 225 | // Unused constructors and operators
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| 226 | // -----------------------------------------------------------------------
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| 227 | NameIdPool(const NameIdPool<TElem>&);
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| 228 | NameIdPool<TElem>& operator=(const NameIdPool<TElem>&);
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| 229 |
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| 230 |
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| 231 | // -----------------------------------------------------------------------
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| 232 | // Private helper methods
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| 233 | // -----------------------------------------------------------------------
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| 234 | NameIdPoolBucketElem<TElem>* findBucketElem
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| 235 | (
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| 236 | const XMLCh* const key
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| 237 | , unsigned int& hashVal
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| 238 | );
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| 239 | const NameIdPoolBucketElem<TElem>* findBucketElem
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| 240 | (
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| 241 | const XMLCh* const key
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| 242 | , unsigned int& hashVal
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| 243 | ) const;
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| 244 |
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| 245 |
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| 246 | // -----------------------------------------------------------------------
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| 247 | // Data members
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| 248 | //
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| 249 | // fBucketList
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| 250 | // This is the array that contains the heads of all of the list
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| 251 | // buckets, one for each possible hash value.
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| 252 | //
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| 253 | // fIdPtrs
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| 254 | // fIdPtrsCount
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| 255 | // This is the array of pointers to the bucket elements in order of
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| 256 | // their assigned ids. So taking id N and referencing this array
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| 257 | // gives you the element with that id. The count field indicates
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| 258 | // the current size of this list. When fIdCounter+1 reaches this
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| 259 | // value the list must be expanded.
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| 260 | //
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| 261 | // fIdCounter
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| 262 | // This is used to give out unique ids to added elements. It starts
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| 263 | // at zero (which means empty), and is bumped up for each newly added
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| 264 | // element. So the first element is 1, the next is 2, etc... This
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| 265 | // means that this value is set to the top index of the fIdPtrs array.
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| 266 | //
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| 267 | // fHashModulus
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| 268 | // This is the modulus to use in this pool. The fBucketList array
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| 269 | // is of this size. It should be a prime number.
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| 270 | // -----------------------------------------------------------------------
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| 271 | MemoryManager* fMemoryManager;
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| 272 | NameIdPoolBucketElem<TElem>** fBucketList;
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| 273 | TElem** fIdPtrs;
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| 274 | unsigned int fIdPtrsCount;
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| 275 | unsigned int fIdCounter;
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| 276 | unsigned int fHashModulus;
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| 277 | };
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| 278 |
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| 279 |
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| 280 | //
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| 281 | // An enumerator for a name id pool. It derives from the basic enumerator
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| 282 | // class, so that pools can be generically enumerated.
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| 283 | //
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| 284 | template <class TElem> class NameIdPoolEnumerator : public XMLEnumerator<TElem>, public XMemory
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| 285 | {
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| 286 | public :
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| 287 | // -----------------------------------------------------------------------
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| 288 | // Constructors and Destructor
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| 289 | // -----------------------------------------------------------------------
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| 290 | NameIdPoolEnumerator
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| 291 | (
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| 292 | NameIdPool<TElem>* const toEnum
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| 293 | , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
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| 294 | );
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| 295 |
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| 296 | NameIdPoolEnumerator
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| 297 | (
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| 298 | const NameIdPoolEnumerator<TElem>& toCopy
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| 299 | );
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| 300 |
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| 301 | virtual ~NameIdPoolEnumerator();
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| 302 |
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| 303 | // -----------------------------------------------------------------------
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| 304 | // Public operators
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| 305 | // -----------------------------------------------------------------------
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| 306 | NameIdPoolEnumerator<TElem>& operator=
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| 307 | (
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| 308 | const NameIdPoolEnumerator<TElem>& toAssign
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| 309 | );
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| 310 |
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| 311 | // -----------------------------------------------------------------------
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| 312 | // Enum interface
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| 313 | // -----------------------------------------------------------------------
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| 314 | bool hasMoreElements() const;
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| 315 | TElem& nextElement();
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| 316 | void Reset();
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| 317 | int size() const;
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| 318 |
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| 319 | private :
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| 320 | // -----------------------------------------------------------------------
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| 321 | // Data Members
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| 322 | //
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| 323 | // fCurIndex
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| 324 | // This is the current index into the pool's id mapping array. This
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| 325 | // is now we enumerate it.
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| 326 | //
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| 327 | // fToEnum
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| 328 | // The name id pool that is being enumerated.
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| 329 | // -----------------------------------------------------------------------
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| 330 | unsigned int fCurIndex;
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| 331 | NameIdPool<TElem>* fToEnum;
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| 332 | MemoryManager* const fMemoryManager;
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| 333 | };
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| 334 |
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| 335 | XERCES_CPP_NAMESPACE_END
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| 336 |
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| 337 | #if !defined(XERCES_TMPLSINC)
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| 338 | #include <xercesc/util/NameIdPool.c>
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| 339 | #endif
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| 340 |
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| 341 | #endif
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