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# ArenaAllocator.hpp

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    00001 /*
    00002  * The Apache Software License, Version 1.1
    00003  *
    00004  *
    00005  * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights
    00006  * reserved.
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    00008  * Redistribution and use in source and binary forms, with or without
    00009  * modification, are permitted provided that the following conditions
    00010  * are met:
    00011  *
    00012  * 1. Redistributions of source code must retain the above copyright
    00013  *    notice, this list of conditions and the following disclaimer.
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    00015  * 2. Redistributions in binary form must reproduce the above copyright
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    00017  *    the documentation and/or other materials provided with the
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    00019  *
    00020  * 3. The end-user documentation included with the redistribution,
    00021  *    if any, must include the following acknowledgment:
    00022  *       "This product includes software developed by the
    00023  *        Apache Software Foundation (http://www.apache.org/)."
    00024  *    Alternately, this acknowledgment may appear in the software itself,
    00025  *    if and wherever such third-party acknowledgments normally appear.
    00026  *
    00027  * 4. The names "Xalan" and "Apache Software Foundation" must
    00028  *    not be used to endorse or promote products derived from this
    00029  *    software without prior written permission. For written
    00030  *    permission, please contact apache@apache.org.
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    00032  * 5. Products derived from this software may not be called "Apache",
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    00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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    00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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    00048  * ====================================================================
    00049  *
    00050  * This software consists of voluntary contributions made by many
    00051  * individuals on behalf of the Apache Software Foundation and was
    00052  * originally based on software copyright (c) 1999, International
    00053  * Business Machines, Inc., http://www.ibm.com.  For more
    00054  * information on the Apache Software Foundation, please see
    00055  * <http://www.apache.org/>.
    00056  */
    00057
    00058 #if !defined(ARENAALLOCATOR_INCLUDE_GUARD_1357924680)
    00059 #define ARENAALLOCATOR_INCLUDE_GUARD_1357924680
    00060
    00061
    00062
    00063 #include <algorithm>
    00064 #include <vector>
    00065
    00066
    00067
    00068 #include "ArenaBlock.hpp"
    00069
    00070
    00071
    00072 XALAN_CPP_NAMESPACE_BEGIN
    00073
    00074
    00075
    00076 template<class Type>
    00077 class ArenaDeleteFunctor
    00078 {
    00079 public:
    00080
    00081     void
    00082 	operator()(const Type* theType) const
    00083     {
    00084 #if defined(XALAN_CANNOT_DELETE_CONST)
    00085         delete (Type*)theType;
    00086 #else
    00087         delete theType;
    00088 #endif
    00089     }
    00090 };
    00091
    00092
    00093
    00094 template<class ObjectType,
    00095 #if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS)
    00096          class ArenaBlockType>
    00097 #else
    00098          class ArenaBlockType = ArenaBlock<ObjectType> >
    00099 #endif
    00100 class ArenaAllocator
    00101 {
    00102 public:
    00103
    00104     typedef typename ArenaBlockType::size_type  size_type;
    00105
    00106     /*
    00107      * Construct an instance that will allocate blocks of the specified size.
    00108      *
    00109      * @param theBlockSize The block size.
    00110      */
    00111     ArenaAllocator(size_type    theBlockSize) :
    00112         m_blockSize(theBlockSize),
    00113         m_blocks()
    00114     {
    00115     }
    00116
    00117     virtual
    00118     ~ArenaAllocator()
    00119     {
    00120         reset();
    00121     }
    00122
    00123     /*
    00124      * Get size of an ArenaBlock, that is, the number
    00125      * of objects in each block.
    00126      *
    00127      * @return The size of the block
    00128      */
    00129     size_type
    00130     getBlockSize() const
    00131     {
    00132         return m_blockSize;
    00133     }
    00134
    00135     /*
    00136      * Set size of an ArenaBlock, that is, the number
    00137      * of objects in each block.  Only affects blocks
    00138      * allocated after the call.
    00139      *
    00140      * @param theSize The size of the block
    00141      */
    00142     void
    00143     setBlockSize(size_type  theSize)
    00144     {
    00145         m_blockSize = theSize;
    00146     }
    00147
    00148     /*
    00149      * Get the number of ArenaBlocks currently allocated.
    00150      *
    00151      * @return The number of blocks.
    00152      */
    00153     size_type
    00154     getBlockCount() const
    00155     {
    00156         return m_blocks.size();
    00157     }
    00158
    00159     /*
    00160      * Allocate a block of the appropriate size for an
    00161      * object.  Call commitAllocation() when after
    00162      * the object is successfully constructed.
    00163      *
    00164      * @return A pointer to a block of memory
    00165      */
    00166     virtual ObjectType*
    00167     allocateBlock()
    00168     {
    00169         if (m_blocks.empty() == true ||
    00170             m_blocks.back()->blockAvailable() == false)
    00171         {
    00172             m_blocks.push_back(new ArenaBlockType(m_blockSize));
    00173         }
    00174         assert(m_blocks.empty() == false && m_blocks.back() != 0 && m_blocks.back()->blockAvailable() == true);
    00175
    00176         return m_blocks.back()->allocateBlock();
    00177     }
    00178
    00179     /*
    00180      * Commits the allocation of the previous
    00181      * allocateBlock() call.
    00182      *
    00183      * @param theObject A pointer to a block of memory
    00184      */
    00185     virtual void
    00186     commitAllocation(ObjectType*    theObject)
    00187     {
    00188         assert(m_blocks.empty() == false && m_blocks.back()->ownsBlock(theObject) == true);
    00189
    00190         m_blocks.back()->commitAllocation(theObject);
    00191         assert(m_blocks.back()->ownsObject(theObject) == true);
    00192     }
    00193
    00194     virtual bool
    00195     ownsObject(const ObjectType*    theObject) const
    00196     {
    00197         bool    fResult = false;
    00198
    00199         // Search back for a block that may have allocated the object...
    00200         // Note that this-> is required by template lookup rules.
    00201         const typename ArenaBlockListType::const_reverse_iterator   theEnd = this->m_blocks.rend();
    00202
    00203         typename ArenaBlockListType::const_reverse_iterator i = this->m_blocks.rbegin();
    00204
    00205         while(i != theEnd)
    00206         {
    00207             assert(*i != 0);
    00208
    00209             if ((*i)->ownsObject(theObject) == true)
    00210             {
    00211                 fResult = true;
    00212
    00213                 break;
    00214             }
    00215             else
    00216             {
    00217                 ++i;
    00218             }
    00219         }
    00220
    00221         return fResult;
    00222     }
    00223
    00224     virtual void
    00225     reset()
    00226     {
    00227
    00228         XALAN_STD_QUALIFIER for_each(
    00229             m_blocks.begin(),
    00230             m_blocks.end(),
    00231             ArenaDeleteFunctor<ArenaBlockType>());
    00232
    00233         m_blocks.clear();
    00234     }
    00235
    00236 protected:
    00237
    00238     // data members...
    00239 #if defined(XALAN_NO_STD_NAMESPACE)
    00240     typedef vector<ArenaBlockType*>         ArenaBlockListType;
    00241 #else
    00242     typedef std::vector<ArenaBlockType*>    ArenaBlockListType;
    00243 #endif
    00244
    00245     size_type           m_blockSize;
    00246
    00247     ArenaBlockListType  m_blocks;
    00248
    00249 private:
    00250
    00251     // Not defined...
    00252     ArenaAllocator(const ArenaAllocator<ObjectType, ArenaBlockType>&);
    00253
    00254     ArenaAllocator<ObjectType, ArenaBlockType>&
    00255     operator=(const ArenaAllocator<ObjectType, ArenaBlockType>&);
    00256 };
    00257
    00258
    00259
    00260 XALAN_CPP_NAMESPACE_END
    00261
    00262
    00263
    00264 #endif  // !defined(ARENAALLOCATOR_INCLUDE_GUARD_1357924680)

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