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#include "qdbuspendingreply.h"

#include "qdbuspendingcall_p.h"

#include "qdbusmetatype.h"

/*!

    \class QDBusPendingReply

    \inmodule QtDBus

    \since 4.5

    \brief The QDBusPendingReply class contains the reply to an asynchronous method call

    The QDBusPendingReply is a template class with up to 8 template

    parameters. Those parameters are the types that will be used to

    extract the contents of the reply's data.

    This class is similar in functionality to QDBusReply, but with two

    important differences:

    \list

      \o QDBusReply accepts exactly one return type, whereas

         QDBusPendingReply can have from 1 to 8 types

      \o QDBusReply only works on already completed replies, whereas

         QDBusPendingReply allows one to wait for replies from pending

         calls

    \endlist

    Where with QDBusReply you would write:

    \snippet doc/src/snippets/code/src_qdbus_qdbusreply.cpp 0

    with QDBusPendingReply, the equivalent code (including the blocking

    wait for the reply) would be:

    \snippet doc/src/snippets/code/src.qdbus.qdbuspendingreply.cpp 0

    For method calls that have more than one output argument, with

    QDBusReply, you would write:

    \snippet doc/src/snippets/code/src_qdbus_qdbusreply.cpp 1

    whereas with QDBusPendingReply, all of the output arguments should

    be template parameters:

    \snippet doc/src/snippets/code/src.qdbus.qdbuspendingreply.cpp 2

    QDBusPendingReply objects can be associated with

    QDBusPendingCallWatcher objects, which emit signals when the reply

    arrives.

    \sa QDBusPendingCallWatcher, QDBusReply,

        QDBusAbstractInterface::asyncCall()

*/

/*!

    \fn QDBusPendingReply::QDBusPendingReply()

    Creates an empty QDBusPendingReply object. Without assigning a

    QDBusPendingCall object to this reply, QDBusPendingReply cannot do

    anything. All functions return their failure values.

*/

/*!

    \fn QDBusPendingReply::QDBusPendingReply(const QDBusPendingReply &other)

    Creates a copy of the \a other QDBusPendingReply object. Just like

    QDBusPendingCall and QDBusPendingCallWatcher, this QDBusPendingReply

    object will share the same pending call reference. All copies

    share the same return values.

*/

/*!

    \fn QDBusPendingReply::QDBusPendingReply(const QDBusPendingCall &call)

    Creates a QDBusPendingReply object that will take its contents from

    the \a call pending asynchronous call. This QDBusPendingReply object

    will share the same pending call reference as \a call.

*/

/*!

    \fn QDBusPendingReply::QDBusPendingReply(const QDBusMessage &message)

    Creates a QDBusPendingReply object that will take its contents from

    the message \a message. In this case, this object will be already

    in its finished state and the reply's contents will be accessible.

    \sa isFinished()

*/

/*!

    \fn QDBusPendingReply &QDBusPendingReply::operator=(const QDBusPendingReply &other)

    Makes a copy of \a other and drops the reference to the current

    pending call. If the current reference is to an unfinished pending

    call and this is the last reference, the pending call will be

    canceled and there will be no way of retrieving the reply's

    contents, when they arrive.

*/

/*!

    \fn QDBusPendingReply &QDBusPendingReply::operator=(const QDBusPendingCall &call)

    Makes this object take its contents from the \a call pending call

    and drops the reference to the current pending call. If the

    current reference is to an unfinished pending call and this is the

    last reference, the pending call will be canceled and there will

    be no way of retrieving the reply's contents, when they arrive.

*/

/*!

    \fn QDBusPendingReply &QDBusPendingReply::operator=(const QDBusMessage &message)

    Makes this object take its contents from the \a message message

    and drops the reference to the current pending call. If the

    current reference is to an unfinished pending call and this is the

    last reference, the pending call will be canceled and there will

    be no way of retrieving the reply's contents, when they arrive.

    After this function is finished, the QDBusPendingReply object will

    be in its "finished" state and the \a message contents will be

    accessible.

    \sa isFinished()

*/

/*!

    \fn int QDBusPendingReply::count() const

    Return the number of arguments the reply is supposed to have. This

    number matches the number of non-void template parameters in this

    class.

    If the reply arrives with a different number of arguments (or with

    different types), it will be transformed into an error reply

    indicating a bad signature.

*/

/*!

    \fn QVariant QDBusPendingReply::argumentAt(int index) const

    Returns the argument at position \a index in the reply's

    contents. If the reply doesn't have that many elements, this

    function's return value is undefined (will probably cause an

    assertion failure), so it is important to verify that the

    processing is finished and the reply is valid.

*/

/*!

    \fn Type QDBusPendingReply::argumentAt() const

    Returns the argument at position \c Index (which is a template

    parameter) cast to type \c Type. This function uses template code

    to determine the proper \c Type type, according to the type list

    used in the construction of this object.

    Note that, if the reply hasn't arrived, this function causes the

    calling thread to block until the reply is processed.

*/

/*!

    \fn T1 QDBusPendingReply::value() const

    Returns the first argument in this reply, cast to type \c T1 (the

    first template parameter of this class). This is equivalent to

    calling argumentAt<0>().

    This function is provided as a convenience, matching the

    QDBusReply::value() function.

    Note that, if the reply hasn't arrived, this function causes the

    calling thread to block until the reply is processed.

*/

/*!

    \fn QDBusPendingReply::operator T1() const

    Returns the first argument in this reply, cast to type \c T1 (the

    first template parameter of this class). This is equivalent to

    calling argumentAt<0>().

    This function is provided as a convenience, matching the

    QDBusReply::value() function.

    Note that, if the reply hasn't arrived, this function causes the

    calling thread to block until the reply is processed.

*/

/*!

    \fn void QDBusPendingReply::waitForFinished()

    Suspends the execution of the calling thread until the reply is

    received and processed. After this function returns, isFinished()

    should return true, indicating the reply's contents are ready to

    be processed.

    \sa QDBusPendingCallWatcher::waitForFinished()

*/

QDBusPendingReplyData::QDBusPendingReplyData()

    : QDBusPendingCall(0)         // initialize base class empty

{

}

QDBusPendingReplyData::~QDBusPendingReplyData()

{

}

void QDBusPendingReplyData::assign(const QDBusPendingCall &other)

{

    QDBusPendingCall::operator=(other);

}

void QDBusPendingReplyData::assign(const QDBusMessage &message)

{

    d = new QDBusPendingCallPrivate; // drops the reference to the old one

    d->replyMessage = message;

}

QVariant QDBusPendingReplyData::argumentAt(int index) const

{

    if (d)

        d->waitForFinished();   // bypasses "const"

    Q_ASSERT_X(d && index >= 0 && index < d->replyMessage.arguments().count(),

               "QDBusPendingReply::argumentAt",

               "Index out of bounds");

    return d->replyMessage.arguments().at(index);

}

void QDBusPendingReplyData::setMetaTypes(int count, const int *types)

{

    Q_ASSERT(d);

    d->setMetaTypes(count, types);

    d->checkReceivedSignature();

}