source: XMLIO_V2/external/src/POCO/XML/NamePool.cpp @ 80

//
// NamePool.cpp
//
// $Id: //poco/1.3/XML/src/NamePool.cpp#1 $
//
// Library: XML
// Package: XML
// Module:  NamePool
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include <Poco/XML/NamePool.h>
#include <Poco/Exception.h>


namespace Poco {
namespace XML {


class NamePoolItem
{
public:
        NamePoolItem(): _used(false)
        {
        }
        
        ~NamePoolItem()
        {
        }
        
        bool set(const XMLString& qname, const XMLString& namespaceURI, const XMLString& localName)
        {
                if (!_used)
                {
                        _name.assign(qname, namespaceURI, localName);
                        _used = true;
                        return true;
                }
                else return _name.equals(qname, namespaceURI, localName);
        }
        
        const Name& get() const
        {
                return _name;
        }
        
        bool used() const
        {
                return _used;
        }
        
private:
        Name _name;
        bool _used;
};


NamePool::NamePool(unsigned long size): 
        _size(size),
        _rc(1)
{
        poco_assert (size > 1);

        _pItems = new NamePoolItem[size];
}


NamePool::~NamePool()
{
        delete [] _pItems;
}


void NamePool::duplicate()
{
        ++_rc;
}


void NamePool::release()
{
        if (--_rc == 0)
                delete this;
}


const Name& NamePool::insert(const XMLString& qname, const XMLString& namespaceURI, const XMLString& localName)
{
        unsigned long i = 0;
        unsigned long n = hash(qname, namespaceURI, localName) % _size;

        while (!_pItems[n].set(qname, namespaceURI, localName) && i++ < _size) 
                n = (n + 1) % _size;
                
        if (i > _size) throw Poco::PoolOverflowException("XML name pool");

        return _pItems[n].get();
}


const Name& NamePool::insert(const Name& name)
{
        return insert(name.qname(), name.namespaceURI(), name.localName());
}


unsigned long NamePool::hash(const XMLString& qname, const XMLString& namespaceURI, const XMLString& localName)
{
        unsigned long h = 0;
        XMLString::const_iterator it  = qname.begin();
        XMLString::const_iterator end = qname.end();
        while (it != end) h = (h << 5) + h + (unsigned long) *it++;
        it =  namespaceURI.begin();
        end = namespaceURI.end();
        while (it != end) h = (h << 5) + h + (unsigned long) *it++;
        it  = localName.begin();
        end = localName.end();
        while (it != end) h = (h << 5) + h + (unsigned long) *it++;
        return h;
}


} } // namespace Poco::XML