| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 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 "Xalan" 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. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * 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/>. |
| */ |
| |
| #if !defined(ARENAALLOCATOR_INCLUDE_GUARD_1357924680) |
| #define ARENAALLOCATOR_INCLUDE_GUARD_1357924680 |
| |
| |
| |
| #include <algorithm> |
| #include <vector> |
| |
| |
| |
| #include "ArenaBlock.hpp" |
| |
| |
| |
| template<class Type> |
| class ArenaDeleteFunctor |
| { |
| public: |
| |
| void |
| operator()(const Type* theType) const |
| { |
| #if defined(XALAN_CANNOT_DELETE_CONST) |
| delete (Type*)theType; |
| #else |
| delete theType; |
| #endif |
| } |
| }; |
| |
| |
| |
| template<class ObjectType, |
| #if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS) |
| class ArenaBlockType> |
| #else |
| class ArenaBlockType = ArenaBlock<ObjectType> > |
| #endif |
| class ArenaAllocator |
| { |
| public: |
| |
| typedef typename ArenaBlockType::size_type size_type; |
| |
| /* |
| * Construct an instance that will allocate blocks of the specified size. |
| * |
| * @param theBlockSize The block size. |
| */ |
| ArenaAllocator(size_type theBlockSize) : |
| m_blockSize(theBlockSize), |
| m_blocks() |
| { |
| } |
| |
| virtual |
| ~ArenaAllocator() |
| { |
| reset(); |
| } |
| |
| /* |
| * Get size of an ArenaBlock, that is, the number |
| * of objects in each block. |
| * |
| * @return The size of the block |
| */ |
| size_type |
| getBlockSize() const |
| { |
| return m_blockSize; |
| } |
| |
| /* |
| * Set size of an ArenaBlock, that is, the number |
| * of objects in each block. Only affects blocks |
| * allocated after the call. |
| * |
| * @param theSize The size of the block |
| */ |
| void |
| setBlockSize(size_type theSize) |
| { |
| m_blockSize = theSize; |
| } |
| |
| /* |
| * Get the number of ArenaBlocks currently allocated. |
| * |
| * @return The number of blocks. |
| */ |
| size_type |
| getBlockCount() const |
| { |
| return m_blocks.size(); |
| } |
| |
| /* |
| * Allocate a block of the appropriate size for an |
| * object. Call commitAllocation() when after |
| * the object is successfully constructed. |
| * |
| * @return A pointer to a block of memory |
| */ |
| virtual ObjectType* |
| allocateBlock() |
| { |
| if (m_blocks.size() == 0 || |
| m_blocks.back()->blockAvailable() == false) |
| { |
| m_blocks.push_back(new ArenaBlockType(m_blockSize)); |
| } |
| assert(m_blocks.size() > 0 && m_blocks.back() != 0 && m_blocks.back()->blockAvailable() == true); |
| |
| return m_blocks.back()->allocateBlock(); |
| } |
| |
| /* |
| * Commits the allocation of the previous |
| * allocateBlock() call. |
| * |
| * @param theObject A pointer to a block of memory |
| */ |
| virtual void |
| commitAllocation(ObjectType* theObject) |
| { |
| assert(m_blocks.size() != 0 && m_blocks.back()->ownsBlock(theObject) == true); |
| |
| m_blocks.back()->commitAllocation(theObject); |
| assert(m_blocks.back()->ownsObject(theObject) == true); |
| } |
| |
| virtual bool |
| ownsObject(const ObjectType* theObject) const |
| { |
| bool fResult = false; |
| |
| // Search back for a block that may have allocated the object... |
| // Note that this-> is required by template lookup rules. |
| const typename ArenaBlockListType::const_reverse_iterator theEnd = this->m_blocks.rend(); |
| |
| typename ArenaBlockListType::const_reverse_iterator i = this->m_blocks.rbegin(); |
| |
| while(i != theEnd) |
| { |
| assert(*i != 0); |
| |
| if ((*i)->ownsObject(theObject) == true) |
| { |
| fResult = true; |
| |
| break; |
| } |
| else |
| { |
| ++i; |
| } |
| } |
| |
| return fResult; |
| } |
| |
| virtual void |
| reset() |
| { |
| #if !defined(XALAN_NO_NAMESPACES) |
| using std::for_each; |
| #endif |
| |
| for_each(m_blocks.begin(), |
| m_blocks.end(), |
| ArenaDeleteFunctor<ArenaBlockType>()); |
| |
| m_blocks.clear(); |
| } |
| |
| protected: |
| |
| // data members... |
| #if defined(XALAN_NO_NAMESPACES) |
| typedef vector<ArenaBlockType*> ArenaBlockListType; |
| #else |
| typedef std::vector<ArenaBlockType*> ArenaBlockListType; |
| #endif |
| |
| size_type m_blockSize; |
| |
| ArenaBlockListType m_blocks; |
| |
| private: |
| |
| // Not defined... |
| ArenaAllocator(const ArenaAllocator<ObjectType, ArenaBlockType>&); |
| |
| ArenaAllocator<ObjectType, ArenaBlockType>& |
| operator=(const ArenaAllocator<ObjectType, ArenaBlockType>&); |
| }; |
| |
| |
| |
| #endif // !defined(ARENAALLOCATOR_INCLUDE_GUARD_1357924680) |