/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSql module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qsqlindex.h"

#include "qsqlfield.h"
#include "qstringlist.h"

QT_BEGIN_NAMESPACE

/*!
    \class QSqlIndex
    \brief The QSqlIndex class provides functions to manipulate and
    describe database indexes.

    \ingroup database
    \inmodule QtSql

    An \e index refers to a single table or view in a database.
    Information about the fields that comprise the index can be used
    to generate SQL statements.
*/

/*!
    Constructs an empty index using the cursor name \a cursorname and
    index name \a name.
*/

QSqlIndex::QSqlIndex(const QString& cursorname, const QString& name)
    : cursor(cursorname), nm(name)
{
}

/*!
    Constructs a copy of \a other.
*/

QSqlIndex::QSqlIndex(const QSqlIndex& other)
    : QSqlRecord(other), cursor(other.cursor), nm(other.nm), sorts(other.sorts)
{
}

/*!
    Sets the index equal to \a other.
*/

QSqlIndex& QSqlIndex::operator=(const QSqlIndex& other)
{
    cursor = other.cursor;
    nm = other.nm;
    sorts = other.sorts;
    QSqlRecord::operator=(other);
    return *this;
}

/*!
    Destroys the object and frees any allocated resources.
*/

QSqlIndex::~QSqlIndex()
{

}

/*!
    Sets the name of the index to \a name.
*/

void QSqlIndex::setName(const QString& name)
{
    nm = name;
}

/*!
    \fn QString QSqlIndex::name() const

    Returns the name of the index.
*/

/*!
    Appends the field \a field to the list of indexed fields. The
    field is appended with an ascending sort order.
*/

void QSqlIndex::append(const QSqlField& field)
{
    append(field, false);
}

/*!
    \overload

    Appends the field \a field to the list of indexed fields. The
    field is appended with an ascending sort order, unless \a desc is
    true.
*/

void QSqlIndex::append(const QSqlField& field, bool desc)
{
    sorts.append(desc);
    QSqlRecord::append(field);
}


/*!
    Returns \c true if field \a i in the index is sorted in descending
    order; otherwise returns \c false.
*/

bool QSqlIndex::isDescending(int i) const
{
    if (i >= 0 && i < sorts.size())
        return sorts[i];
    return false;
}

/*!
    If \a desc is true, field \a i is sorted in descending order.
    Otherwise, field \a i is sorted in ascending order (the default).
    If the field does not exist, nothing happens.
*/

void QSqlIndex::setDescending(int i, bool desc)
{
    if (i >= 0 && i < sorts.size())
        sorts[i] = desc;
}

/*! \internal

  Creates a string representing the field number \a i using prefix \a
  prefix. If \a verbose is true, ASC or DESC is included in the field
  description if the field is sorted in ASCending or DESCending order.
*/

QString QSqlIndex::createField(int i, const QString& prefix, bool verbose) const
{
    QString f;
    if (!prefix.isEmpty())
        f += prefix + QLatin1Char('.');
    f += field(i).name();
    if (verbose)
        f += QLatin1Char(' ') + QString((isDescending(i)
                    ? QLatin1String("DESC") : QLatin1String("ASC")));
    return f;
}

/*!
    \fn QString QSqlIndex::cursorName() const

    Returns the name of the cursor which the index is associated with.
*/


/*!
    Sets the name of the cursor that the index is associated with to
    \a cursorName.
*/
void QSqlIndex::setCursorName(const QString& cursorName)
{
    cursor = cursorName;
}

QT_END_NAMESPACE
