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/*

  archiveextractor.cpp

*/

#include "archiveextractor.h"

QT_BEGIN_NAMESPACE

QList<ArchiveExtractor *> ArchiveExtractor::extractors;

/*!

  \class ArchiveExtractor

  \brief The ArchiveExtractor class is a base class for classes that

  know how to unpack a certain kind of archive file.

  The archive extractor contains a list of the filename extensions

  of the files that the archive extractor knows how to unpack.

  It maintains a static list of all the instances of ArchiveExtractor

  that have been created. It also has a static function for searching

  that list to find the archive extracter for a file with a certain

  extension.

 */

/*!

  The constructor takes a list of filename extensions, which it

  copies and saves internally. This archive extractor is prepended

  to the static list.

 */

ArchiveExtractor::ArchiveExtractor( const QStringList& extensions )

    : fileExts( extensions )

{

    extractors.prepend( this );

}

/*!

  The destructor deletes all the filename extensions.

 */

ArchiveExtractor::~ArchiveExtractor()

{

    extractors.removeAll( this );

}

/*!

  This function searches the static list of archive extractors

  to find the first one that can handle \a fileName. If it finds

  an acceptable extractor, it returns a pointer to it. Otherwise

  it returns null.

 */

ArchiveExtractor*

ArchiveExtractor::extractorForFileName( const QString& fileName )

{

    int dot = -1;

    while ( (dot = fileName.indexOf(QLatin1Char('.'), dot + 1)) != -1 ) {

        QString ext = fileName.mid( dot + 1 );

        QList<ArchiveExtractor *>::ConstIterator e = extractors.begin();

        while ( e != extractors.end() ) {

            if ( (*e)->fileExtensions().contains(ext) )

                return *e;

            ++e;

        }

    }

    return 0;

}

QT_END_NAMESPACE