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//
// NamePool.cpp
//
// Library: XML
// Package: XML
// Module: NamePool
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/XML/NamePool.h"
#include "Poco/Exception.h"
#include "Poco/Random.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),
_salt(0),
_rc(1)
{
poco_assert (size > 1);
_pItems = new NamePoolItem[size];
Poco::Random rnd;
rnd.seed();
_salt = rnd.next();
}
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) ^ _salt) % _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
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