q3networkprotocol.cpp

奇趣公司比较新的qt/emd版本

    d->opInProgress = op;
    d->operationQueue.dequeue();
    processOperation( op );
}

/*!
    Returns the Q3UrlOperator on which the protocol works.
*/

Q3UrlOperator *Q3NetworkProtocol::url() const
{
    return d->url;
}

/*!
    Returns the operation, which is being processed, or 0 of no
    operation is being processed at the moment.
*/

Q3NetworkOperation *Q3NetworkProtocol::operationInProgress() const
{
    return d->opInProgress;
}

/*!
    Clears the operation queue.
*/

void Q3NetworkProtocol::clearOperationQueue()
{
    d->operationQueue.dequeue();
    d->operationQueue.setAutoDelete( true );
    d->operationQueue.clear();
}

/*!
    Stops the current operation that is being processed and clears all
    waiting operations.
*/

void Q3NetworkProtocol::stop()
{
    Q3NetworkOperation *op = d->opInProgress;
    clearOperationQueue();
    if ( op ) {
	op->setState( StStopped );
	op->setProtocolDetail( tr( "Operation stopped by the user" ) );
	emit finished( op );
	setUrl( 0 );
	op->free();
    }
}

/*!
    Because it's sometimes hard to take care of removing network
    protocol instances, Q3NetworkProtocol provides an auto-delete
    mechanism. If you set \a b to true, the network protocol instance
    is removed after it has been inactive for \a i milliseconds (i.e.
    \a i milliseconds after the last operation has been processed).
    If you set \a b to false the auto-delete mechanism is switched
    off.

    If you switch on auto-delete, the Q3NetworkProtocol also deletes
    its Q3UrlOperator.
*/

void Q3NetworkProtocol::setAutoDelete( bool b, int i )
{
    d->autoDelete = b;
    d->removeInterval = i;
}

/*!
    Returns true if auto-deleting is enabled; otherwise returns false.

    \sa Q3NetworkProtocol::setAutoDelete()
*/

bool Q3NetworkProtocol::autoDelete() const
{
    return d->autoDelete;
}

/*!
  \internal
*/

void Q3NetworkProtocol::removeMe()
{
    if ( d->autoDelete ) {
#ifdef Q3NETWORKPROTOCOL_DEBUG
	qDebug( "Q3NetworkOperation:  autodelete of Q3NetworkProtocol %p", this );
#endif
	delete d->url; // destructor deletes the network protocol
    }
}

void Q3NetworkProtocol::emitNewChildren( const QUrlInfo &i, Q3NetworkOperation *op )
{
    Q3ValueList<QUrlInfo> lst;
    lst << i;
    emit newChildren( lst, op );
}

class Q3NetworkOperationPrivate
{
public:
    Q3NetworkProtocol::Operation operation;
    Q3NetworkProtocol::State state;
    QMap<int, QString> args;
    QMap<int, QByteArray> rawArgs;
    QString protocolDetail;
    int errorCode;
    QTimer *deleteTimer;
};

/*!
    \class Q3NetworkOperation

    \brief The Q3NetworkOperation class provides common operations for network protocols.

    \compat

    An object is created to describe the operation and the current
    state for each operation that a network protocol should process.

    \sa Q3NetworkProtocol
*/

/*!
    Constructs a network operation object. \a operation is the type of
    the operation, and \a arg0, \a arg1 and \a arg2 are the first
    three arguments of the operation. The state is initialized to
    Q3NetworkProtocol::StWaiting.

    \sa Q3NetworkProtocol::Operation Q3NetworkProtocol::State
*/

Q3NetworkOperation::Q3NetworkOperation( Q3NetworkProtocol::Operation operation,
				      const QString &arg0, const QString &arg1,
				      const QString &arg2 )
{
    d = new Q3NetworkOperationPrivate;
    d->deleteTimer = new QTimer( this );
    connect( d->deleteTimer, SIGNAL(timeout()),
	     this, SLOT(deleteMe()) );
    d->operation = operation;
    d->state = Q3NetworkProtocol::StWaiting;
    d->args[ 0 ] = arg0;
    d->args[ 1 ] = arg1;
    d->args[ 2 ] = arg2;
    d->rawArgs[ 0 ] = QByteArray( 0 );
    d->rawArgs[ 1 ] = QByteArray( 0 );
    d->rawArgs[ 2 ] = QByteArray( 0 );
    d->protocolDetail.clear();
    d->errorCode = (int)Q3NetworkProtocol::NoError;
}

/*!
    Constructs a network operation object. \a operation is the type of
    the operation, and \a arg0, \a arg1 and \a arg2 are the first
    three raw data arguments of the operation. The state is
    initialized to Q3NetworkProtocol::StWaiting.

    \sa Q3NetworkProtocol::Operation Q3NetworkProtocol::State
*/

Q3NetworkOperation::Q3NetworkOperation( Q3NetworkProtocol::Operation operation,
				      const QByteArray &arg0, const QByteArray &arg1,
				      const QByteArray &arg2 )
{
    d = new Q3NetworkOperationPrivate;
    d->deleteTimer = new QTimer( this );
    connect( d->deleteTimer, SIGNAL(timeout()),
	     this, SLOT(deleteMe()) );
    d->operation = operation;
    d->state = Q3NetworkProtocol::StWaiting;
    d->args[ 0 ].clear();
    d->args[ 1 ].clear();
    d->args[ 2 ].clear();
    d->rawArgs[ 0 ] = arg0;
    d->rawArgs[ 1 ] = arg1;
    d->rawArgs[ 2 ] = arg2;
    d->protocolDetail.clear();
    d->errorCode = (int)Q3NetworkProtocol::NoError;
}

/*!
    Destructor.
*/

Q3NetworkOperation::~Q3NetworkOperation()
{
    delete d;
}

/*!
    Sets the \a state of the operation object. This should be done by
    the network protocol during processing; at the end it should be
    set to Q3NetworkProtocol::StDone or Q3NetworkProtocol::StFailed,
    depending on success or failure.

    \sa Q3NetworkProtocol::State
*/

void Q3NetworkOperation::setState( Q3NetworkProtocol::State state )
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    d->state = state;
}

/*!
    If the operation failed, the error message can be specified as \a
    detail.
*/

void Q3NetworkOperation::setProtocolDetail( const QString &detail )
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    d->protocolDetail = detail;
}

/*!
    Sets the error code to \a ec.

    If the operation failed, the protocol should set an error code to
    describe the error in more detail. If possible, one of the error
    codes defined in Q3NetworkProtocol should be used.

    \sa setProtocolDetail() Q3NetworkProtocol::Error
*/

void Q3NetworkOperation::setErrorCode( int ec )
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    d->errorCode = ec;
}

/*!
    Sets the network operation's \a{num}-th argument to \a arg.
*/

void Q3NetworkOperation::setArg( int num, const QString &arg )
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    d->args[ num ] = arg;
}

/*!
    Sets the network operation's \a{num}-th raw data argument to \a arg.
*/

void Q3NetworkOperation::setRawArg( int num, const QByteArray &arg )
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    d->rawArgs[ num ] = arg;
}

/*!
    Returns the type of the operation.
*/

Q3NetworkProtocol::Operation Q3NetworkOperation::operation() const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->operation;
}

/*!
    Returns the state of the operation. You can determine whether an
    operation is still waiting to be processed, is being processed,
    has been processed successfully, or failed.
*/

Q3NetworkProtocol::State Q3NetworkOperation::state() const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->state;
}

/*!
    Returns the operation's \a{num}-th argument. If this argument was
    not already set, an empty string is returned.
*/

QString Q3NetworkOperation::arg( int num ) const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->args[ num ];
}

/*!
    Returns the operation's \a{num}-th raw data argument. If this
    argument was not already set, an empty bytearray is returned.
*/

QByteArray Q3NetworkOperation::rawArg( int num ) const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->rawArgs[ num ];
}

/*!
    Returns a detailed error message for the last error. This must
    have been set using setProtocolDetail().
*/

QString Q3NetworkOperation::protocolDetail() const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->protocolDetail;
}

/*!
    Returns the error code for the last error that occurred.
*/

int Q3NetworkOperation::errorCode() const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->errorCode;
}

/*!
  \internal
*/

QByteArray& Q3NetworkOperation::raw( int num ) const
{
    if ( d->deleteTimer->isActive() ) {
	d->deleteTimer->stop();
	d->deleteTimer->start( NETWORK_OP_DELAY );
    }
    return d->rawArgs[ num ];
}

/*!
    Sets this object to delete itself when it hasn't been used for one
    second.

    Because Q3NetworkOperation pointers are passed around a lot the
    Q3NetworkProtocol generally does not have enough knowledge to
    delete these at the correct time. If a Q3NetworkProtocol doesn't
    need an operation any more it will call this function instead.

    Note: you should never need to call the method yourself.
*/

void Q3NetworkOperation::free()
{
    d->deleteTimer->start( NETWORK_OP_DELAY );
}

/*!
  \internal
  Internal slot for auto-deletion.
*/

void Q3NetworkOperation::deleteMe()
{
    delete this;
}

#include "moc_q3networkprotocol.cpp"
#endif