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/***************************************************************************
MetaData.h - base class for associated meta data
-------------------
begin : Sat Jan 23 2010
copyright : (C) 2010 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#ifndef META_DATA_H
#define META_DATA_H
#include "config.h"
#include "libkwave_export.h"
#include <QtGlobal>
#include <QList>
#include <QMap>
#include <QMutex>
#include <QSharedData>
#include <QSharedDataPointer>
#include <QString>
#include <QStringList>
#include <QVariant>
#include "libkwave/Sample.h"
namespace Kwave
{
class LIBKWAVE_EXPORT MetaData
{
public:
/** standard property: type of the meta data object */
static const QString STDPROP_TYPE;
/** standard property: position [zero based sample index] */
static const QString STDPROP_POS;
/** standard property: description (string) */
static const QString STDPROP_DESCRIPTION;
typedef enum
{
/** no scope */
None = 0,
/** whole signal */
Signal = (1 << 0),
/**
* bound to a single sample, requires the property
* "STDPROP_POS" with data type "QVariant::ULongLong"
*/
Position = (1 << 2),
} Scope;
/** List of metadata properties */
typedef QMap<QString, QVariant> PropertyList;
/**
* default constructor, generates a metadata object
* with a new ID
*/
MetaData();
/**
* copy constructor
* @param other the other meta data object to copy from
*/
MetaData(const MetaData &other);
/** constructor */
explicit MetaData(Scope scope);
/** destructor */
virtual ~MetaData();
/** removes all properties */
virtual void clear();
/** returns true if this is an empty record */
virtual bool isNull() const;
/** returns the ID of the meta data */
QString id() const;
/** returns the scope of the meta data */
Scope scope() const;
/**
* Sets the scope of the meta data
* @param scope the new scope
*/
void setScope(Scope scope);
/**
* Sets a property to a new value. If the property already exists
* it will be created and if it did not exist, a new one will be
* created. If the value is not valid (null), the property will
* be deleted.
* @param p name of the property
* @param value a QVariant with the property's data
*/
void setProperty(const QString &p, const QVariant &value);
/**
* Checks whether this metadata object contains a given property.
* @param p name of the property
* @return true if the property exists, false otherwise
*/
bool hasProperty(const QString &p) const;
/**
* Returns a QVariant with the copy of the value of a property
* or an empty QVariant if the property does not exist.
* @param p name of the property
* @return value of the property or an empty QVariant
*/
QVariant property(const QString &p) const;
/** Same as above, for using through the [] operator */
inline QVariant operator [] (const QString p) const
{
return property(p);
}
/**
* Returns a mutable reference to an existing property (or the
* reference to an empty dummy if it did not exist).
* @param p name of the property
* @return reference to the value of the property
*/
QVariant &property(const QString &p);
/** Same as above, for using through the [] operator */
inline QVariant &operator [] (const QString p)
{
return property(p);
}
/** equal operator, compares by data (not by ID) */
bool operator == (const MetaData &other) const;
/** not equal operator, compares by data (not by ID) */
inline bool operator != (const MetaData &other) const
{
return !(operator == (other));
}
/** assignment operator */
inline MetaData & operator = (const MetaData &other)
{
m_data = other.m_data;
return *this;
}
/** returns a list with all property names */
QStringList keys() const;
/** returns a list of position bount property names */
static QStringList positionBoundPropertyNames();
/**
* Returns the index of the first sample covered by a given
* meta data item
* @return index of the first sample
*/
sample_index_t firstSample() const;
/**
* Returns the index of the last sample covered by a given
* meta data item
* @return index of the last sample
*/
sample_index_t lastSample() const;
/** dump all properties to stdout, for debugging */
virtual void dump() const;
private:
/** internal container class with meta data */
class MetaDataPriv: public QSharedData
{
public:
/** constructor */
MetaDataPriv();
/** copy constructor */
MetaDataPriv(const MetaDataPriv &other);
/** destructor */
virtual ~MetaDataPriv();
/** id of the meta data */
QString m_id;
/** scope of the meta data */
Scope m_scope;
/** list of properties, user defined */
PropertyList m_properties;
private:
/** creates a new unique ID */
static QString newUid();
/** counter for unique id generation */
static quint64 m_id_counter;
/** mutex for protecting the id generator */
static QMutex m_id_lock;
};
/** pointer to the shared meta data */
QSharedDataPointer<MetaDataPriv> m_data;
};
}
#endif /* META_DATA_H */
//***************************************************************************
//***************************************************************************
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