/***************************************************************************
copyright : (C) 2002 - 2008 by Scott Wheeler
email : wheeler@kde.org
***************************************************************************/
/***************************************************************************
* This library is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Lesser General Public License version *
* 2.1 as published by the Free Software Foundation. *
* *
* This library is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this library; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 USA *
* *
* Alternatively, this file is available under the Mozilla Public *
* License Version 1.1. You may obtain a copy of the License at *
* http://www.mozilla.org/MPL/ *
***************************************************************************/
#ifndef TAGLIB_TAG_H
#define TAGLIB_TAG_H
#include "taglib_export.h"
#include "tstring.h"
namespace TagLib {
//! A simple, generic interface to common audio meta data fields
/*!
* This is an attempt to abstract away the difference in the meta data formats
* of various audio codecs and tagging schemes. As such it is generally a
* subset of what is available in the specific formats but should be suitable
* for most applications. This is meant to compliment the generic APIs found
* in TagLib::AudioProperties, TagLib::File and TagLib::FileRef.
*/
class PropertyMap;
class TAGLIB_EXPORT Tag
{
public:
/*!
* Destroys this Tag instance.
*/
virtual ~Tag();
/*!
* Exports the tags of the file as dictionary mapping (human readable) tag
* names (Strings) to StringLists of tag values.
* The default implementation in this class considers only the usual built-in
* tags (artist, album, ...) and only one value per key.
*/
PropertyMap properties() const;
/*!
* Removes unsupported properties, or a subset of them, from the tag.
* The parameter \a properties must contain only entries from
* properties().unsupportedData().
* BIC: Will become virtual in future releases. Currently the non-virtual
* standard implementation of TagLib::Tag does nothing, since there are
* no unsupported elements.
*/
void removeUnsupportedProperties(const StringList& properties);
/*!
* Sets the tags of this File to those specified in \a properties. This default
* implementation sets only the tags for which setter methods exist in this class
* (artist, album, ...), and only one value per key; the rest will be contained
* in the returned PropertyMap.
*/
PropertyMap setProperties(const PropertyMap &properties);
/*!
* Returns the track name; if no track name is present in the tag
* String::null will be returned.
*/
virtual String title() const = 0;
/*!
* Returns the artist name; if no artist name is present in the tag
* String::null will be returned.
*/
virtual String artist() const = 0;
/*!
* Returns the album name; if no album name is present in the tag
* String::null will be returned.
*/
virtual String album() const = 0;
/*!
* Returns the track comment; if no comment is present in the tag
* String::null will be returned.
*/
virtual String comment() const = 0;
/*!
* Returns the genre name; if no genre is present in the tag String::null
* will be returned.
*/
virtual String genre() const = 0;
/*!
* Returns the year; if there is no year set, this will return 0.
*/
virtual unsigned int year() const = 0;
/*!
* Returns the track number; if there is no track number set, this will
* return 0.
*/
virtual unsigned int track() const = 0;
/*!
* Sets the title to \a s. If \a s is String::null then this value will be
* cleared.
*/
virtual void setTitle(const String &s) = 0;
/*!
* Sets the artist to \a s. If \a s is String::null then this value will be
* cleared.
*/
virtual void setArtist(const String &s) = 0;
/*!
* Sets the album to \a s. If \a s is String::null then this value will be
* cleared.
*/
virtual void setAlbum(const String &s) = 0;
/*!
* Sets the comment to \a s. If \a s is String::null then this value will be
* cleared.
*/
virtual void setComment(const String &s) = 0;
/*!
* Sets the genre to \a s. If \a s is String::null then this value will be
* cleared. For tag formats that use a fixed set of genres, the appropriate
* value will be selected based on a string comparison. A list of available
* genres for those formats should be available in that type's
* implementation.
*/
virtual void setGenre(const String &s) = 0;
/*!
* Sets the year to \a i. If \a s is 0 then this value will be cleared.
*/
virtual void setYear(unsigned int i) = 0;
/*!
* Sets the track to \a i. If \a s is 0 then this value will be cleared.
*/
virtual void setTrack(unsigned int i) = 0;
/*!
* Returns true if the tag does not contain any data. This should be
* reimplemented in subclasses that provide more than the basic tagging
* abilities in this class.
*/
virtual bool isEmpty() const;
/*!
* Copies the generic data from one tag to another.
*
* \note This will no affect any of the lower level details of the tag. For
* instance if any of the tag type specific data (maybe a URL for a band) is
* set, this will not modify or copy that. This just copies using the API
* in this class.
*
* If \a overwrite is true then the values will be unconditionally copied.
* If false only empty values will be overwritten.
*/
static void duplicate(const Tag *source, Tag *target, bool overwrite = true);
protected:
/*!
* Construct a Tag. This is protected since tags should only be instantiated
* through subclasses.
*/
Tag();
private:
Tag(const Tag &);
Tag &operator=(const Tag &);
class TagPrivate;
TagPrivate *d;
};
}
#endif