mirror of
https://github.com/clementine-player/Clementine
synced 2024-12-24 00:31:36 +01:00
264 lines
9.2 KiB
C++
264 lines
9.2 KiB
C++
/***************************************************************************
|
|
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_FILEREF_H
|
|
#define TAGLIB_FILEREF_H
|
|
|
|
#include "tfile.h"
|
|
#include "tstringlist.h"
|
|
|
|
#include "taglib_export.h"
|
|
#include "audioproperties.h"
|
|
|
|
namespace TagLib {
|
|
|
|
class Tag;
|
|
|
|
//! This class provides a simple abstraction for creating and handling files
|
|
|
|
/*!
|
|
* FileRef exists to provide a minimal, generic and value-based wrapper around
|
|
* a File. It is lightweight and implicitly shared, and as such suitable for
|
|
* pass-by-value use. This hides some of the uglier details of TagLib::File
|
|
* and the non-generic portions of the concrete file implementations.
|
|
*
|
|
* This class is useful in a "simple usage" situation where it is desirable
|
|
* to be able to get and set some of the tag information that is similar
|
|
* across file types.
|
|
*
|
|
* Also note that it is probably a good idea to plug this into your mime
|
|
* type system rather than using the constructor that accepts a file name using
|
|
* the FileTypeResolver.
|
|
*
|
|
* \see FileTypeResolver
|
|
* \see addFileTypeResolver()
|
|
*/
|
|
|
|
class TAGLIB_EXPORT FileRef
|
|
{
|
|
public:
|
|
|
|
//! A class for pluggable file type resolution.
|
|
|
|
/*!
|
|
* This class is used to add extend TagLib's very basic file name based file
|
|
* type resolution.
|
|
*
|
|
* This can be accomplished with:
|
|
*
|
|
* \code
|
|
*
|
|
* class MyFileTypeResolver : FileTypeResolver
|
|
* {
|
|
* TagLib::File *createFile(TagLib::FileName *fileName, bool, AudioProperties::ReadStyle) const
|
|
* {
|
|
* if(someCheckForAnMP3File(fileName))
|
|
* return new TagLib::MPEG::File(fileName);
|
|
* return 0;
|
|
* }
|
|
* }
|
|
*
|
|
* FileRef::addFileTypeResolver(new MyFileTypeResolver);
|
|
*
|
|
* \endcode
|
|
*
|
|
* Naturally a less contrived example would be slightly more complex. This
|
|
* can be used to plug in mime-type detection systems or to add new file types
|
|
* to TagLib.
|
|
*/
|
|
|
|
class TAGLIB_EXPORT FileTypeResolver
|
|
{
|
|
TAGLIB_IGNORE_MISSING_DESTRUCTOR
|
|
public:
|
|
/*!
|
|
* This method must be overridden to provide an additional file type
|
|
* resolver. If the resolver is able to determine the file type it should
|
|
* return a valid File object; if not it should return 0.
|
|
*
|
|
* \note The created file is then owned by the FileRef and should not be
|
|
* deleted. Deletion will happen automatically when the FileRef passes
|
|
* out of scope.
|
|
*/
|
|
virtual File *createFile(FileName fileName,
|
|
bool readAudioProperties = true,
|
|
AudioProperties::ReadStyle
|
|
audioPropertiesStyle = AudioProperties::Average) const = 0;
|
|
};
|
|
|
|
/*!
|
|
* Creates a null FileRef.
|
|
*/
|
|
FileRef();
|
|
|
|
/*!
|
|
* Create a FileRef from \a fileName. If \a readAudioProperties is true then
|
|
* the audio properties will be read using \a audioPropertiesStyle. If
|
|
* \a readAudioProperties is false then \a audioPropertiesStyle will be
|
|
* ignored.
|
|
*
|
|
* Also see the note in the class documentation about why you may not want to
|
|
* use this method in your application.
|
|
*/
|
|
explicit FileRef(FileName fileName,
|
|
bool readAudioProperties = true,
|
|
AudioProperties::ReadStyle
|
|
audioPropertiesStyle = AudioProperties::Average);
|
|
|
|
/*!
|
|
* Construct a FileRef using \a file. The FileRef now takes ownership of the
|
|
* pointer and will delete the File when it passes out of scope.
|
|
*/
|
|
explicit FileRef(File *file);
|
|
|
|
/*!
|
|
* Make a copy of \a ref.
|
|
*/
|
|
FileRef(const FileRef &ref);
|
|
|
|
/*!
|
|
* Destroys this FileRef instance.
|
|
*/
|
|
virtual ~FileRef();
|
|
|
|
/*!
|
|
* Returns a pointer to represented file's tag.
|
|
*
|
|
* \warning This pointer will become invalid when this FileRef and all
|
|
* copies pass out of scope.
|
|
*
|
|
* \warning Do not cast it to any subclasses of \class Tag.
|
|
* Use tag returning methods of appropriate subclasses of \class File instead.
|
|
*
|
|
* \see File::tag()
|
|
*/
|
|
Tag *tag() const;
|
|
|
|
/*!
|
|
* Returns the audio properties for this FileRef. If no audio properties
|
|
* were read then this will returns a null pointer.
|
|
*/
|
|
AudioProperties *audioProperties() const;
|
|
|
|
/*!
|
|
* Returns a pointer to the file represented by this handler class.
|
|
*
|
|
* As a general rule this call should be avoided since if you need to work
|
|
* with file objects directly, you are probably better served instantiating
|
|
* the File subclasses (i.e. MPEG::File) manually and working with their APIs.
|
|
*
|
|
* This <i>handle</i> exists to provide a minimal, generic and value-based
|
|
* wrapper around a File. Accessing the file directly generally indicates
|
|
* a moving away from this simplicity (and into things beyond the scope of
|
|
* FileRef).
|
|
*
|
|
* \warning This pointer will become invalid when this FileRef and all
|
|
* copies pass out of scope.
|
|
*/
|
|
File *file() const;
|
|
|
|
/*!
|
|
* Saves the file. Returns true on success.
|
|
*/
|
|
bool save();
|
|
|
|
/*!
|
|
* Adds a FileTypeResolver to the list of those used by TagLib. Each
|
|
* additional FileTypeResolver is added to the front of a list of resolvers
|
|
* that are tried. If the FileTypeResolver returns zero the next resolver
|
|
* is tried.
|
|
*
|
|
* Returns a pointer to the added resolver (the same one that's passed in --
|
|
* this is mostly so that static initializers have something to use for
|
|
* assignment).
|
|
*
|
|
* \see FileTypeResolver
|
|
*/
|
|
static const FileTypeResolver *addFileTypeResolver(const FileTypeResolver *resolver);
|
|
|
|
/*!
|
|
* As is mentioned elsewhere in this class's documentation, the default file
|
|
* type resolution code provided by TagLib only works by comparing file
|
|
* extensions.
|
|
*
|
|
* This method returns the list of file extensions that are used by default.
|
|
*
|
|
* The extensions are all returned in lowercase, though the comparison used
|
|
* by TagLib for resolution is case-insensitive.
|
|
*
|
|
* \note This does not account for any additional file type resolvers that
|
|
* are plugged in. Also note that this is not intended to replace a proper
|
|
* mime-type resolution system, but is just here for reference.
|
|
*
|
|
* \see FileTypeResolver
|
|
*/
|
|
static StringList defaultFileExtensions();
|
|
|
|
/*!
|
|
* Returns true if the file (and as such other pointers) are null.
|
|
*/
|
|
bool isNull() const;
|
|
|
|
/*!
|
|
* Assign the file pointed to by \a ref to this FileRef.
|
|
*/
|
|
FileRef &operator=(const FileRef &ref);
|
|
|
|
/*!
|
|
* Returns true if this FileRef and \a ref point to the same File object.
|
|
*/
|
|
bool operator==(const FileRef &ref) const;
|
|
|
|
/*!
|
|
* Returns true if this FileRef and \a ref do not point to the same File
|
|
* object.
|
|
*/
|
|
bool operator!=(const FileRef &ref) const;
|
|
|
|
/*!
|
|
* A simple implementation of file type guessing. If \a readAudioProperties
|
|
* is true then the audio properties will be read using
|
|
* \a audioPropertiesStyle. If \a readAudioProperties is false then
|
|
* \a audioPropertiesStyle will be ignored.
|
|
*
|
|
* \note You generally shouldn't use this method, but instead the constructor
|
|
* directly.
|
|
*
|
|
* \deprecated
|
|
*/
|
|
static File *create(FileName fileName,
|
|
bool readAudioProperties = true,
|
|
AudioProperties::ReadStyle audioPropertiesStyle = AudioProperties::Average);
|
|
|
|
|
|
private:
|
|
class FileRefPrivate;
|
|
FileRefPrivate *d;
|
|
};
|
|
|
|
} // namespace TagLib
|
|
|
|
#endif
|