q3urloperator.cpp

奇趣公司比较新的qt/emd版本

    op->setState( Q3NetworkProtocol::StFailed );
    op->setProtocolDetail( msg );
    op->setErrorCode( (int)Q3NetworkProtocol::ErrUnsupported );
    emit finished( op );
    deleteOperation( op );
    return 0;
}

/*!
    Starts listing the children of this URL (e.g. the files in the
    directory). The start() signal is emitted before the first entry
    is listed and finished() is emitted after the last one. The
    newChildren() signal is emitted for each list of new entries. If
    an error occurs, the signal finished() is emitted, so be sure to
    check the state of the network operation pointer.

    Because the operation may not be executed immediately, a pointer
    to the Q3NetworkOperation object created by this function is
    returned. This object contains all the data about the operation
    and is used to refer to this operation later (e.g. in the signals
    that are emitted by the Q3UrlOperator). The return value can also
    be 0 if the operation object couldn't be created.

    The path of this Q3UrlOperator must to point to a directory
    (because the children of this directory will be listed), not to a
    file.
*/

const Q3NetworkOperation *Q3UrlOperator::listChildren()
{
    if ( !checkValid() )
	return 0;

    Q3NetworkOperation *res = new Q3NetworkOperation( Q3NetworkProtocol::OpListChildren, QString(), QString(), QString() );
    return startOperation( res );
}

/*!
    Tries to create a directory (child) with the name \a dirname. If
    it is successful, a newChildren() signal with the new child is
    emitted, and the createdDirectory() signal with the information
    about the new child is also emitted. The finished() signal (with
    success or failure) is emitted after the operation has been
    processed, so check the state of the network operation object to
    see whether or not the operation was successful.

    Because the operation will not be executed immediately, a pointer
    to the Q3NetworkOperation object created by this function is
    returned. This object contains all the data about the operation
    and is used to refer to this operation later (e.g. in the signals
    that are emitted by the Q3UrlOperator). The return value can also
    be 0 if the operation object couldn't be created.

    The path of this Q3UrlOperator must to point to a directory (not a
    file) because the new directory will be created in this path.
*/

const Q3NetworkOperation *Q3UrlOperator::mkdir( const QString &dirname )
{
    if ( !checkValid() )
	return 0;

    Q3NetworkOperation *res = new Q3NetworkOperation( Q3NetworkProtocol::OpMkDir, dirname, QString(), QString() );
    return startOperation( res );
}

/*!
    Tries to remove the file (child) \a filename. If it succeeds the
    removed() signal is emitted. finished() (with success or failure)
    is also emitted after the operation has been processed, so check
    the state of the network operation object to see whether or not
    the operation was successful.

    Because the operation will not be executed immediately, a pointer
    to the Q3NetworkOperation object created by this function is
    returned. This object contains all the data about the operation
    and is used to refer to this operation later (e.g. in the signals
    that are emitted by the Q3UrlOperator). The return value can also
    be 0 if the operation object couldn't be created.

    The path of this Q3UrlOperator must point to a directory; because
    if \a filename is relative, it will try to remove it in this
    directory.
*/

const Q3NetworkOperation *Q3UrlOperator::remove( const QString &filename )
{
    if ( !checkValid() )
	return 0;

    Q3NetworkOperation *res = new Q3NetworkOperation( Q3NetworkProtocol::OpRemove, filename, QString(), QString() );
    return startOperation( res );
}

/*!
    Tries to rename the file (child) called \a oldname to \a newname.
    If it succeeds, the itemChanged() signal is emitted. finished()
    (with success or failure) is also emitted after the operation has
    been processed, so check the state of the network operation object
    to see whether or not the operation was successful.

    Because the operation may not be executed immediately, a pointer
    to the Q3NetworkOperation object created by this function is
    returned. This object contains all the data about the operation
    and is used to refer to this operation later (e.g. in the signals
    that are emitted by the Q3UrlOperator). The return value can also
    be 0 if the operation object couldn't be created.

    This path of this Q3UrlOperator must to point to a directory
    because \a oldname and \a newname are handled relative to this
    directory.
*/

const Q3NetworkOperation *Q3UrlOperator::rename( const QString &oldname, const QString &newname )
{
    if ( !checkValid() )
	return 0;

    Q3NetworkOperation *res = new Q3NetworkOperation( Q3NetworkProtocol::OpRename, oldname, newname, QString() );
    return startOperation( res );
}

/*!
    Copies the file \a from to \a to. If \a move is true, the file is
    moved (copied and removed). \a from must point to a file and \a to
    must point to a directory (into which \a from is copied) unless \a
    toPath is set to false. If \a toPath is set to false then the \a
    to variable is assumed to be the absolute file path (destination
    file path + file name). The copying is done using the get() and
    put() operations. If you want to be notified about the progress of
    the operation, connect to the dataTransferProgress() signal. Bear
    in mind that the get() and put() operations emit this signal
    through the Q3UrlOperator. The number of transferred bytes and the
    total bytes that you receive as arguments in this signal do not
    relate to the the whole copy operation; they relate first to the
    get() and then to the put() operation. Always check what type of
    operation the signal comes from; this is given in the signal's
    last argument.

    At the end, finished() (with success or failure) is emitted, so
    check the state of the network operation object to see whether or
    not the operation was successful.

    Because a move or copy operation consists of multiple operations
    (get(), put() and maybe remove()), this function doesn't return a
    single Q3NetworkOperation, but rather a list of them. They are in
    the order: get(), put() and (if applicable) remove().

    \sa get(), put()
*/

Q3PtrList<Q3NetworkOperation> Q3UrlOperator::copy( const QString &from, const QString &to, bool move, bool toPath )
{
#ifdef Q3URLOPERATOR_DEBUG
    qDebug( "Q3UrlOperator: copy %s %s %d", from.latin1(), to.latin1(), move );
#endif

    Q3PtrList<Q3NetworkOperation> ops;
    ops.setAutoDelete( false );

    Q3UrlOperator *uFrom = new Q3UrlOperator( *this, from );
    Q3UrlOperator *uTo = new Q3UrlOperator( to );

    // prepare some string for later usage
    QString frm = *uFrom;
    QString file = uFrom->fileName();

    if (frm == to + file)
         return ops;
    
    file.prepend( QLatin1String("/") );

    // uFrom and uTo are deleted when the Q3NetworkProtocol deletes itself via
    // autodelete
    uFrom->getNetworkProtocol();
    uTo->getNetworkProtocol();
    Q3NetworkProtocol *gProt = uFrom->d->networkProtocol;
    Q3NetworkProtocol *pProt = uTo->d->networkProtocol;

    uFrom->setPath( uFrom->dirPath() );

    if ( gProt && (gProt->supportedOperations()&Q3NetworkProtocol::OpGet) &&
	 pProt && (pProt->supportedOperations()&Q3NetworkProtocol::OpPut) ) {

	connect( gProt, SIGNAL(data(QByteArray,Q3NetworkOperation*)),
		 this, SLOT(copyGotData(QByteArray,Q3NetworkOperation*)) );
	connect( gProt, SIGNAL(dataTransferProgress(int,int,Q3NetworkOperation*)),
		 this, SIGNAL(dataTransferProgress(int,int,Q3NetworkOperation*)) );
	connect( gProt, SIGNAL(finished(Q3NetworkOperation*)),
		 this, SLOT(continueCopy(Q3NetworkOperation*)) );
	connect( gProt, SIGNAL(finished(Q3NetworkOperation*)),
		 this, SIGNAL(finished(Q3NetworkOperation*)) );
	connect( gProt, SIGNAL(connectionStateChanged(int,QString)),
		 this, SIGNAL(connectionStateChanged(int,QString)) );

	connect( pProt, SIGNAL(dataTransferProgress(int,int,Q3NetworkOperation*)),
		 this, SIGNAL(dataTransferProgress(int,int,Q3NetworkOperation*)) );
	connect( pProt, SIGNAL(finished(Q3NetworkOperation*)),
		 this, SIGNAL(finished(Q3NetworkOperation*)) );
	connect( pProt, SIGNAL(finished(Q3NetworkOperation*)),
		 this, SLOT(finishedCopy()) );

	Q3NetworkOperation *opGet = new Q3NetworkOperation( Q3NetworkProtocol::OpGet, frm, QString(), QString() );
	ops.append( opGet );
	gProt->addOperation( opGet );


	QString toFile = to + file;
	if (!toPath)
	    toFile = to;

	Q3NetworkOperation *opPut = new Q3NetworkOperation( Q3NetworkProtocol::OpPut, toFile, QString(), QString() );
	ops.append( opPut );

	d->getOpPutProtMap.insert( (void*)opGet, pProt );
	d->getOpGetProtMap.insert( (void*)opGet, gProt );
	d->getOpPutOpMap.insert( (void*)opGet, opPut );

	if ( move && (gProt->supportedOperations()&Q3NetworkProtocol::OpRemove) ) {
	    gProt->setAutoDelete( false );

	    Q3NetworkOperation *opRm = new Q3NetworkOperation( Q3NetworkProtocol::OpRemove, frm, QString(), QString() );
	    ops.append( opRm );
	    d->getOpRemoveOpMap.insert( (void*)opGet, opRm );
	} else {
	    gProt->setAutoDelete( true );
	}
#ifdef Q3URLOPERATOR_DEBUG
	qDebug( "Q3UrlOperator: copy operation should start now..." );
#endif
	return ops;
    } else {
	QString msg;
	if ( !gProt ) {
	    msg = tr( "The protocol `%1' is not supported" ).arg( uFrom->protocol() );
	} else if ( gProt->supportedOperations() & Q3NetworkProtocol::OpGet ) {
	    msg = tr( "The protocol `%1' does not support copying or moving files or directories" ).arg( uFrom->protocol() );
	} else if ( !pProt ) {
	    msg = tr( "The protocol `%1' is not supported" ).arg( uTo->protocol() );
	} else {
	    msg = tr( "The protocol `%1' does not support copying or moving files or directories" ).arg( uTo->protocol() );
	}
	delete uFrom;
	delete uTo;
	Q3NetworkOperation *res = new Q3NetworkOperation( Q3NetworkProtocol::OpGet, frm, to, QString() );
	res->setState( Q3NetworkProtocol::StFailed );
	res->setProtocolDetail( msg );
	res->setErrorCode( (int)Q3NetworkProtocol::ErrUnsupported );
	emit finished( res );
	deleteOperation( res );
    }

    return ops;
}

/*!
    \overload

    Copies the \a files to the directory \a dest. If \a move is true
    the files are moved, not copied. \a dest must point to a
    directory.

    This function calls copy() for each entry in \a files in turn. You
    don't get a result from this function; each time a new copy
    begins, startedNextCopy() is emitted, with a list of
    Q3NetworkOperations that describe the new copy operation.
*/

void Q3UrlOperator::copy( const QStringList &files, const QString &dest,
			 bool move )
{
    d->waitingCopies = files;
    d->waitingCopiesDest = dest;
    d->waitingCopiesMove = move;

    finishedCopy();
}

/*!
    Returns true if the URL is a directory; otherwise returns false.
    This may not always work correctly, if the protocol of the URL is
    something other than file (local filesystem). If you pass a bool
    pointer as the \a ok argument, *\a ok is set to true if the result
    of this function is known to be correct, and to false otherwise.
*/

bool Q3UrlOperator::isDir( bool *ok )
{
    if ( ok )
	*ok = true;
    if ( isLocalFile() ) {
	if ( QFileInfo( path() ).isDir() )
	    return true;
	else
	    return false;
    }

    if ( d->entryMap.contains( QLatin1String(".") ) ) {
	return d->entryMap[ QLatin1String(".") ].isDir();
    }
    // #### can assume that we are a directory?
    if ( ok )
	*ok = false;
    return true;
}

/*!
    Tells the network protocol to get data from \a location or, if
    it is empty, to get data from the location to which this
    URL points (see Q3Url::fileName() and Q3Url::encodedPathAndQuery()).
    What happens then depends on the network protocol. The data()
    signal is emitted when data comes in. Because it's unlikely that
    all data will come in at once, it is common for multiple data()
    signals to be emitted. The dataTransferProgress() signal is
    emitted while processing the operation. At the end, finished()
    (with success or failure) is emitted, so check the state of the
    network operation object to see whether or not the operation was
    successful.

    If \a location is empty, the path of this Q3UrlOperator
    should point to a file when you use this operation. If \a location
    is not empty, it can be a relative URL (a child of the path to
    which the Q3UrlOperator points) or an absolute URL.

    For example, to get a web page you might do something like this:

    \code
    Q3UrlOperator op( "http://www.whatever.org/cgi-bin/search.pl?cmd=Hello" );
    op.get();
    \endcode

    For most other operations, the path of the Q3UrlOperator must point
    to a directory. If you want to download a file you could do the
    following:

    \code
    Q3UrlOperator op( "ftp://ftp.whatever.org/pub" );
    // do some other stuff like op.listChildren() or op.mkdir( "new_dir" )
    op.get( "a_file.txt" );
    \endcode

    This will get the data of ftp://ftp.whatever.org/pub/a_file.txt.

    \e Never do anything like this:
    \code
    Q3UrlOperator op( "http://www.whatever.org/cgi-bin" );
    op.get( "search.pl?cmd=Hello" ); // WRONG!
    \endcode

    If \a location is not empty and relative it must not contain any
    queries or references, just the name of a child. So if you need to
    specify a query or reference, do it as shown in the first example
    or specify the full URL (such as
    http://www.whatever.org/cgi-bin/search.pl?cmd=Hello) as \a location.

    \sa copy()
*/

const Q3NetworkOperation *Q3UrlOperator::get( const QString &location )
{
    Q3Url u( *this );
    if ( !location.isEmpty() )
	u = Q3Url( *this, location );

    if ( !u.isValid() )
	return 0;

    if ( !d->networkProtocol ) {
	setProtocol( u.protocol() );
	getNetworkProtocol();
    }

    Q3NetworkOperation *res = new Q3NetworkOperation( Q3NetworkProtocol::OpGet, u, QString(), QString() );
    return startOperation( res );
}

/*!
    This function tells the network protocol to put \a data in \a
    location. If \a location is empty, it puts the \a data in the
    location to which the URL points. What happens depends on
    the network protocol. Depending on the network protocol, some
    data might come back after putting data, in which case the data()
    signal is emitted. The dataTransferProgress() signal is emitted
    during processing of the operation. At the end, finished() (with
    success or failure) is emitted, so check the state of the network
    operation object to see whether or not the operation was
    successful.

    If \a location is empty, the path of this Q3UrlOperator should
    point to a file when you use this operation. If \a location
    is not empty, it can be a relative (a child of the path to which
    the Q3UrlOperator points) or an absolute URL.

    For putting some data to a file you can do the following:

    \code
    Q3UrlOperator op( "ftp://ftp.whatever.com/home/me/filename.dat" );
    op.put( data );
    \endcode

    For most other operations, the path of the Q3UrlOperator must point
    to a directory. If you want to upload data to a file you could do
    the following:

    \code
    Q3UrlOperator op( "ftp://ftp.whatever.com/home/me" );
    // do some other stuff like op.listChildren() or op.mkdir( "new_dir" )
    op.put( data, "filename.dat" );