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/*

  uncompressor.cpp

*/

#include "uncompressor.h"

QT_BEGIN_NAMESPACE

QList<Uncompressor *> Uncompressor::uncompressors;

/*!

  \class Uncompressor

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

  know how to uncompress a certain kind of compressed file.

  The uncompressor contains a list of the filename extensions

  of the file types that the uncompressor knows how to uncompress.

  It maintains a static list of all the instances of Uncompressor

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

  that list to find the uncompressor to use for uncompressing a file

  with a certain extension.

 */

/*!

  The constructor takes a list of filename extensions, which it

  copies and saves internally. This uncompressor is prepended

  to the stack list.

 */

Uncompressor::Uncompressor( const QStringList& extensions )

    : fileExts( extensions )

{

    uncompressors.prepend( this );

}

/*!

  The destructor deletes all the filename extensions.

 */

Uncompressor::~Uncompressor()

{

    uncompressors.removeAll( this );

}

/*!

  This function searches the static list of uncompressors to find the

  first one that can handle \a fileName. If it finds an acceptable

  uncompressor, it returns a pointer to it. Otherwise it returns null.

*/

Uncompressor*

Uncompressor::uncompressorForFileName( const QString& fileName )

{

    int dot = -1;

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

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

        QList<Uncompressor *>::ConstIterator u = uncompressors.begin();

        while ( u != uncompressors.end() ) {

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

                return *u;

            ++u;

        }

    }

    return 0;

}

QT_END_NAMESPACE