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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: http://www.qt-project.org/
**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** Other Usage
**
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**************************************************************************/
#include "id.h"
#include "coreconstants.h"
#include <utils/qtcassert.h>
#include <QByteArray>
#include <QHash>
#include <QVector>
#include <string.h>
namespace Core {
/*!
\class Core::Id
\brief The class Id encapsulates an identifier. It is used as a type-safe
helper class instead of a \c QString or \c QByteArray. The internal
representation of the id is assumed to be plain 7-bit-clean ASCII.
*/
class StringHolder
{
public:
explicit StringHolder(const char *s)
: str(s)
{
n = strlen(s);
int m = n;
h = 0;
while (m--) {
h = (h << 4) + *s++;
h ^= (h & 0xf0000000) >> 23;
h &= 0x0fffffff;
}
}
int n;
const char *str;
uint h;
};
static bool operator==(const StringHolder &sh1, const StringHolder &sh2)
{
// sh.n is unlikely to discriminate better than the hash.
return sh1.h == sh2.h && strcmp(sh1.str, sh1.str) == 0;
}
static uint qHash(const StringHolder &sh)
{
return sh.h;
}
struct IdCache : public QHash<StringHolder, int>
{
#ifndef QTC_ALLOW_STATIC_LEAKS
~IdCache()
{
for (IdCache::iterator it = begin(); it != end(); ++it)
free(const_cast<char *>(it.key().str));
}
#endif
};
static int lastUid = 0;
static QVector<QByteArray> stringFromId;
static IdCache idFromString;
static int theId(const char *str)
{
QTC_ASSERT(str && *str, return 0);
StringHolder sh(str);
int res = idFromString.value(sh, 0);
if (res == 0) {
if (lastUid == 0)
stringFromId.append(QByteArray());
res = ++lastUid;
sh.str = strdup(sh.str);
idFromString[sh] = res;
stringFromId.append(QByteArray::fromRawData(sh.str, sh.n));
}
return res;
}
Id::Id(const char *name)
: m_id(theId(name))
{}
Id::Id(const QString &name)
: m_id(theId(name.toUtf8()))
{}
QByteArray Id::name() const
{
return stringFromId.at(m_id);
}
QString Id::toString() const
{
return QString::fromUtf8(stringFromId[m_id]);
}
// For debugging purposes
CORE_EXPORT const char *nameForId(int id)
{
return (stringFromId.constData() + id)->constData();
}
} // namespace Core
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