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#include "qversitreader.h"

#include "qversitreader_p.h"

#include "versitutils_p.h"

#include "qmobilityglobal.h"

#include <QTextCodec>

#include <QMutexLocker>

#include <QBuffer>

QTM_USE_NAMESPACE

/*!

  \class QVersitReader

  \brief The QVersitReader class reads Versit documents such as vCards from a device.

  \ingroup versit

  QVersitReader concatenation of Versit documents such as vCards

  from a text stream and returns a list of QVersitDocument instances.

  QVersitReader supports reading from an abstract I/O device

  which can be, for example, a file or a memory buffer.

  The reading can be done asynchronously, and the

  waitForFinished() function can be used to make a blocking

  read.

  \sa QVersitDocument

 */

/*!

 * \enum QVersitReader::Error

 * This enum specifies an error that occurred during the most recent operation:

 * \value NoError The most recent operation was successful

 * \value UnspecifiedError The most recent operation failed for an undocumented reason

 * \value IOError The most recent operation failed because of a problem with the device

 * \value OutOfMemoryError The most recent operation failed due to running out of memory

 * \value NotReadyError The most recent operation failed because there is an operation in progress

 * \value ParseError The most recent operation failed because the input was malformed

 */

/*!

 * \enum QVersitReader::State

 * Enumerates the various states that a reader may be in at any given time

 * \value InactiveState Read operation not yet started

 * \value ActiveState Read operation started, not yet finished

 * \value CanceledState Read operation is finished due to cancellation

 * \value FinishedState Read operation successfully completed

 */

/*!

 * \fn QVersitReader::stateChanged(QVersitReader::State state)

 * The signal is emitted by the reader when its state has changed (eg. when it has finished

 * reading from the device).

 * \a state is the new state of the reader.

 */

/*!

 * \fn QVersitReader::resultsAvailable()

 * The signal is emitted by the reader as it reads from the device when it has made more Versit

 * documents available.

 */

/*! Constructs a new reader. */

QVersitReader::QVersitReader() : d(new QVersitReaderPrivate)

{

    d->init(this);

}

/*! Constructs a new reader that reads from \a inputDevice. */

QVersitReader::QVersitReader(QIODevice *inputDevice) : d(new QVersitReaderPrivate)

{

    d->init(this);

    d->mIoDevice = inputDevice;

}

/*! Constructs a new reader that reads from \a inputData. */

QVersitReader::QVersitReader(const QByteArray &inputData) : d(new QVersitReaderPrivate)

{

    d->init(this);

    d->mInputBytes.reset(new QBuffer);

    d->mInputBytes->setData(inputData);

    d->mInputBytes->open(QIODevice::ReadOnly);

    d->mIoDevice = d->mInputBytes.data();

}

/*!

 * Frees the memory used by the reader.

 * Waits until a pending asynchronous reading has been completed.

 */

QVersitReader::~QVersitReader()

{

    d->wait();

    delete d;

}

/*!

 * Sets the device used for reading the input to be the given \a device.

 * Does not take ownership of the device.  This overrides any byte array input source set with

 * setData().

 */

void QVersitReader::setDevice(QIODevice* device)

{

    d->mInputBytes.reset(0);

    d->mIoDevice = device;

}

/*!

 * Returns the device used for reading input, or 0 if no device has been set (or if the input source

 * was set with setData().

 */

QIODevice* QVersitReader::device() const

{

    if (d->mInputBytes.isNull())

        return d->mIoDevice;

    else

        return 0;

}

/*!

 * Sets the data to read from to the byte array input source, \a inputData.

 * This overrides any device set with setDevice().

 */

void QVersitReader::setData(const QByteArray &inputData)

{

    if (d->mInputBytes.isNull())

        d->mInputBytes.reset(new QBuffer);

    d->mInputBytes->setData(inputData);

    d->mIoDevice = d->mInputBytes.data();

}

/*!

 * Sets \a codec as the codec for the reader to use when parsing the input stream to.

 * This codec is not used for values where the CHARSET Versit parameter occurs.

 */

void QVersitReader::setDefaultCodec(QTextCodec *codec)

{

    if (codec != NULL) {

        d->mDefaultCodec = codec;

    } else {

        d->mDefaultCodec = QTextCodec::codecForName("UTF-8");

    }

}

/*!

 * Returns the codec the reader uses when parsing the input stream.

 */

QTextCodec* QVersitReader::defaultCodec() const

{

    return d->mDefaultCodec;

}

/*!

 * Returns the state of the reader.

 */

QVersitReader::State QVersitReader::state() const

{

    return d->state();

}

/*!

 * Returns the error encountered by the last operation.

 */

QVersitReader::Error QVersitReader::error() const

{

    return d->error();

}

/*!

 * Starts reading the input asynchronously.

 * Returns false if the input device has not been set or opened or

 * if there is another asynchronous read operation already pending.

 * Signal \l stateChanged() is emitted with parameter FinishedState

 * when the reading has finished.

 */

bool QVersitReader::startReading()

{    if (d->state() == ActiveState || d->isRunning()) {

        d->setError(QVersitReader::NotReadyError);

        return false;

    } else if (!d->mIoDevice || !d->mIoDevice->isReadable()) {

        d->setError(QVersitReader::IOError);

        return false;

    } else {

        d->setState(ActiveState);

        d->setError(NoError);

        d->setCanceling(false);

        d->start();

        return true;

    }

}

/*!

 * Attempts to asynchronously cancel the read request.

 */

void QVersitReader::cancel()

{

    d->setCanceling(true);

}

/*!

 * If the state is ActiveState, blocks until the reader has finished reading or \a msec milliseconds

 * has elapsed, returning true if it successfully finishes or is cancelled by the user.

 * If the state is FinishedState, returns true immediately.

 * Otherwise, returns false immediately.

 */

bool QVersitReader::waitForFinished(int msec)

{

    State state = d->state();

    if (state == ActiveState) {

        return d->wait(msec);

    } else if (state == FinishedState) {

        return true;

    } else {

        return false;

    }

}

/*!

 * Returns the reading result.  Even if there was an error or reading has not completed, a partial

 * list of results may be returned.

 */

QList<QVersitDocument> QVersitReader::results() const

{

    QMutexLocker locker(&d->mMutex);

    return d->mVersitDocuments;

}

#include "moc_qversitreader.cpp"