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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, 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, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#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)
delete[](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 = qstrdup(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.at(m_id));
}
bool Id::operator==(const char *name) const
{
return strcmp(stringFromId.at(m_id).constData(), name) == 0;
}
// For debugging purposes
CORE_EXPORT const char *nameForId(int id)
{
return (stringFromId.constData() + id)->constData();
}
} // namespace Core
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