MDataAccess Class Reference

Interface for reading and storing key values. More...

Inherits QObject.

Inherited by MAggregateDataAccess, and MDataStore.

List of all members.

Signals
void	valueChanged (const QString &key, const QVariant &value)
Public Member Functions
virtual	~MDataAccess ()
virtual QVariant	value (const QString &key) const =0
virtual bool	setValue (const QString &key, const QVariant &value)=0
virtual QStringList	allKeys () const =0
virtual bool	contains (const QString &key) const =0

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Detailed Description

Interface for reading and storing key values.

Users can read and write key values using this interface. The user also get notified when changes happen in the key values.

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Constructor & Destructor Documentation

virtual MDataAccess::~MDataAccess

(

)

[inline, virtual]

Destroys the MDataAccess.

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Member Function Documentation

virtual QStringList MDataAccess::allKeys

(

)

const [pure virtual]

Returns a list of all specified keys.

virtual bool MDataAccess::contains

(

const QString &

key

)

const [pure virtual]

Returns true if there exists a key called key and false otherwise.

Parameters:

key

the key to test

Returns:

a boolean value telling if the key exists or not

See also:

value() and setValue().

virtual bool MDataAccess::setValue	(	const QString &	key,
		const QVariant &	value
	)			[pure virtual]

Sets a new value for a key. If the key isn't found, nothing happens and false is returned.

Parameters:

	key	the key to be changed.
	value	the new value.

Returns:

true if setting was successful, false otherwise

virtual QVariant MDataAccess::value

(

const QString &

key

)

const [pure virtual]

Returns a value for a key. If the key doesn't exist, an invalid (QVariant::Invalid) value is returned.

Parameters:

key

the key.

Returns:

the requested value.

void MDataAccess::valueChanged	(	const QString &	key,
		const QVariant &	value
	)			[signal]

A signal that is emitted when a key value changes.

Parameters:

	key	the key that changed.
	value	the new value.