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ec86c487e8
This is generally much better thought out than the current method of creating FileRefs using the native mime system and also allows for extension to additional file formats. git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@437382 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
221 lines
7.3 KiB
C++
221 lines
7.3 KiB
C++
/***************************************************************************
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copyright : (C) 2003 by Scott Wheeler
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email : wheeler@kde.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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* USA *
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***************************************************************************/
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#ifndef TAGLIB_FILEREF_H
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#define TAGLIB_FILEREF_H
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#include "audioproperties.h"
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namespace TagLib {
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class String;
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class File;
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class Tag;
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//! This class provides a simple abstraction for creating and handling files
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/*!
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* FileRef exists to provide a minimal, generic and value-based wrapper around
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* a File. It is lightweight and implicitly shared, and as such suitable for
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* pass-by-value use. This hides some of the uglier details of TagLib::File
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* and the non-generic portions of the concrete file implementations.
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*
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* This class is useful in a "simple usage" situation where it is desirable
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* to be able to get and set some of the tag information that is similar
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* across file types.
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*
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* Also note that it is probably a good idea to plug this into your mime
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* type system rather than using the constructor that accepts a file name using
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* the FileTypeResolver.
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*
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* \see FileTypeResolver
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* \see addFileTypeResolver()
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*/
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class FileRef
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{
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public:
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//! A class for pluggable file type resolution.
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/*!
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* This class is used to add extend TagLib's very basic file name based file
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* type resolution.
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*
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* This can be accomplished with:
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*
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* \code
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*
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* class MyFileTypeResolver : FileTypeResolver
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* {
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* TagLib::File *createFile(const char *fileName)
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* {
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* if(someCheckForAnMP3File(fileName))
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* return new TagLib::MPEG::File(fileName);
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* return 0;
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* }
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* }
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*
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* FileRef::addFileTypeResolver(new MyFileTypeResolver);
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*
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* \endcode
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*
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* Naturally a less contrived example would be slightly more complex. This
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* can be used to plug in mime-type detection systems or to add new file types
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* to TagLib.
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*/
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class FileTypeResolver
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{
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public:
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/*!
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* This method must be overriden to provide an additional file type
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* resolver. If the resolver is able to determine the file type it should
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* return a valid File object; if not it should return 0.
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*
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* \note The created file is then owned by the FileRef and should not be
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* deleted. Deletion will happen automatically when the FileRef passes
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* out of scope.
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*/
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virtual File *createFile(const char *fileName) = 0;
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};
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FileRef();
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/*!
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* Create a FileRef from \a fileName. If \a readAudioProperties is true then
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* the audio properties will be read using \a audioPropertiesStyle. If
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* \a readAudioProperties is false then \a audioPropertiesStyle will be
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* ignored.
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*
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* Also see the note in the class documentation about why you may not want to
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* use this method in your application.
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*/
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explicit FileRef(const char *fileName,
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bool readAudioProperties = true,
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AudioProperties::ReadStyle
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audioPropertiesStyle = AudioProperties::Average);
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/*!
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* Contruct a FileRef using \a file. The FileRef now takes ownership of the
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* pointer and will delete the File when it passes out of scope.
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*/
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explicit FileRef(File *file);
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/*!
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* Make a copy of \a ref.
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*/
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FileRef(const FileRef &ref);
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/*!
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* Destroys this FileRef instance.
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*/
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virtual ~FileRef();
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/*!
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* Returns a pointer to represented file's tag.
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*
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* \warning This pointer will become invalid when this FileRef and all
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* copies pass out of scope.
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*
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* \see File::tag()
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*/
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Tag *tag() const;
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/*!
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* Returns the audio properties for this FileRef. If no audio properties
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* were read then this will returns a null pointer.
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*/
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AudioProperties *audioProperties() const;
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/*!
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* Returns a pointer to the file represented by this handler class.
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*
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* As a general rule this call should be avoided since if you need to work
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* with file objects directly, you are probably better served instantiating
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* the File subclasses (i.e. MPEG::File) manually and working with their APIs.
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*
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* This <i>handle</i> exists to provide a minimal, generic and value-based
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* wrapper around a File. Accessing the file directly generally indicates
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* a moving away from this simplicity (and into things beyond the scope of
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* FileRef).
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*
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* \warning This pointer will become invalid when this FileRef and all
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* copies pass out of scope.
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*/
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File *file() const;
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/*!
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* Saves the file. Returns true on success.
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*/
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bool save();
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/*!
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* Adds a FileTypeResolver to the list of those used by TagLib. Each
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* additional FileTypeResolver is added to the front of a list of resolvers
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* that are tried. If the FileTypeResolver returns zero the next resolver
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* is tried.
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*/
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static void addFileTypeResolver(const FileTypeResolver *resolver);
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/*!
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* Returns true if the file (and as such other pointers) are null.
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*/
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bool isNull() const;
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/*!
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* Assign the file pointed to by \a ref to this FileRef.
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*/
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FileRef &operator=(const FileRef &ref);
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/*!
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* Returns true if this FileRef and \a ref point to the same File object.
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*/
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bool operator==(const FileRef &ref) const;
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/*!
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* Returns true if this FileRef and \a ref do not point to the same File
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* object.
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*/
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bool operator!=(const FileRef &ref) const;
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/*!
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* A simple implementation of file type guessing. If \a readAudioProperties
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* is true then the audio properties will be read using
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* \a audioPropertiesStyle. If \a readAudioProperties is false then
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* \a audioPropertiesStyle will be ignored.
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*
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* \note You generally shouldn't use this method, but instead the constructor
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* directly.
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*/
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static File *create(const char *fileName,
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bool readAudioProperties = true,
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AudioProperties::ReadStyle audioPropertiesStyle = AudioProperties::Average);
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private:
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class FileRefPrivate;
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FileRefPrivate *d;
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};
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} // namespace TagLib
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#endif
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