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/*
* Copyright (C) 2003-2015 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_TAG_BUILDER_HXX
#define MPD_TAG_BUILDER_HXX
#include "TagType.h"
#include "Chrono.hxx"
#include "Compiler.h"
#include <vector>
#include <stddef.h>
struct TagItem;
struct Tag;
/**
* A class that constructs #Tag objects.
*/
class TagBuilder {
/**
* The duration of the song. A negative value means that the
* length is unknown.
*/
SignedSongTime duration;
/**
* Does this file have an embedded playlist (e.g. embedded CUE
* sheet)?
*/
bool has_playlist;
/** an array of tag items */
std::vector<TagItem *> items;
public:
/**
* Create an empty tag.
*/
TagBuilder()
:duration(SignedSongTime::Negative()), has_playlist(false) {}
~TagBuilder() {
Clear();
}
TagBuilder(const TagBuilder &other) = delete;
explicit TagBuilder(const Tag &other);
explicit TagBuilder(Tag &&other);
TagBuilder &operator=(const TagBuilder &other);
TagBuilder &operator=(TagBuilder &&other);
TagBuilder &operator=(Tag &&other);
/**
* Returns true if the tag contains no items. This ignores
* the "duration" attribute.
*/
bool IsEmpty() const {
return items.empty();
}
/**
* Returns true if the object contains any information.
*/
gcc_pure
bool IsDefined() const {
return !duration.IsNegative() || has_playlist || !IsEmpty();
}
void Clear();
/**
* Move this object to the given #Tag instance. This object
* is empty afterwards.
*/
void Commit(Tag &tag);
/**
* Create a new #Tag instance from data in this object. This
* object is empty afterwards.
*/
Tag Commit();
/**
* Create a new #Tag instance from data in this object. The
* returned object is owned by the caller. This object is
* empty afterwards.
*/
Tag *CommitNew();
void SetDuration(SignedSongTime _duration) {
duration = _duration;
}
void SetHasPlaylist(bool _has_playlist) {
has_playlist = _has_playlist;
}
void Reserve(unsigned n) {
items.reserve(n);
}
/**
* Checks whether the tag contains one or more items with
* the specified type.
*/
gcc_pure
bool HasType(TagType type) const;
/**
* Copy attributes and items from the other object that do not
* exist in this object.
*/
void Complement(const Tag &other);
/**
* Appends a new tag item.
*
* @param type the type of the new tag item
* @param value the value of the tag item (not null-terminated)
* @param length the length of #value
*/
gcc_nonnull_all
void AddItem(TagType type, const char *value, size_t length);
/**
* Appends a new tag item.
*
* @param type the type of the new tag item
* @param value the value of the tag item (null-terminated)
*/
gcc_nonnull_all
void AddItem(TagType type, const char *value);
/**
* Appends a new tag item with an empty value. Do not use
* this unless you know what you're doing - because usually,
* empty values are discarded.
*/
void AddEmptyItem(TagType type);
/**
* Removes all tag items.
*/
void RemoveAll();
/**
* Removes all tag items of the specified type.
*/
void RemoveType(TagType type);
private:
gcc_nonnull_all
void AddItemInternal(TagType type, const char *value, size_t length);
};
#endif
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