src/XPath/XNumberAllocator.hpp

/*
 * 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
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 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
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 *    Alternately, this acknowledgment may appear in the software itself,
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 * 5. Products derived from this software may not be called "Apache",
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 * ====================================================================
 *
 * 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(XNUMBERALLOCATOR_INCLUDE_GUARD_135792455)
#define XNUMBERALLOCATOR_INCLUDE_GUARD_135792455



// Base include file.  Must be first.
#include <XPath/XPathDefinitions.hpp>



#include <XPath/XNumber.hpp>



#include <PlatformSupport/ReusableArenaAllocator.hpp>



class XALAN_XPATH_EXPORT XNumberAllocator
{
public:

	typedef XNumber			number_type;

	typedef ReusableArenaAllocator<number_type>		ArenaAllocatorType;
	typedef ArenaAllocatorType::size_type			size_type;

	/**
	 * Construct an instance that will allocate blocks of the specified size.
	 *
	 * @param theBlockSize The block size.
	 */
	XNumberAllocator(size_type	theBlockCount);

	~XNumberAllocator();

	/**
	 * Create an XNumber object using allocator from a string.
	 * 
	 * @param theString     source number
	 *
	 * @return a pointer to a number
	 */
	number_type*
	createNumber(double		theNumber);

	/**
	 * Clone an XNumber object.
	 * 
	 * @param value			source XNumber
	 *
	 * @return pointer to an XNumber
	 */
	number_type*
	clone(const XNumber&	value);

	/**
	 * Delete an XNumber object from allocator.	 
	 */
	bool
	destroy(number_type*	theNumber);

	/**
	 * Determine if an object is owned by the allocator...
	 */
	bool
	ownsObject(const number_type*	theObject)
	{
		return m_allocator.ownsObject(theObject);
	}

	/**
	 * Delete all XNumber objects from allocator.	 
	 */	
	void
	reset();

	/**
	 * Get size of an ArenaBlock, that is, the number
	 * of objects in each block.
	 *
	 * @return The size of the block
	 */
	size_type
	getBlockCount() const
	{
		return m_allocator.getBlockCount();
	}

	/**
	 * Get the number of ArenaBlocks currently allocated.
	 *
	 * @return The number of blocks.
	 */
	size_type
	getBlockSize() const
	{
		return m_allocator.getBlockSize();
	}

private:

	// Not implemented...
	XNumberAllocator(const XNumberAllocator&);

	XNumberAllocator&
	operator=(const XNumberAllocator&);

	// Data members...
	ArenaAllocatorType	m_allocator;
};



#endif	// XNUMBERALLOCATOR_INCLUDE_GUARD_135792455