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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
