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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
