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<?php
/**
* File containing the abstract ezcGraphDataSetProperty class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005-2008 eZ systems as. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* Abstract class for properties of datasets
*
* This class is used to extends datasets with additional properties, and
* stores only non default values for each data point in a data set.
*
* The class is extended by property implementations including simple value
* validators, like:
*
* - ezcGraphDataSetAxisProperty
* - ezcGraphDataSetBooleanProperty
* - ezcGraphDataSetColorProperty
* - ezcGraphDataSetIntProperty
* - ezcGraphDataSetStringProperty
*
* The color property can for example be accessed in a chart like:
*
* <code>
* $graph = new ezcGraphLineChart();
* $graph->data['example'] = new ezcGraphArrayDataSet( array(
* 'Foo' => 23,
* 'Bar' => 42,
* ) );
*
* // Set color for all data points in this data set
* $graph->data['example']->color = '#a40000';
*
* // Set different color for one special datapoint
* $graph->data['example']->color['Foo'] = '#2e3436';
*
* $graph->render( 400, 200, 'test.svg' );
* </code>
*
* @version //autogentag//
* @package Graph
*/
abstract class ezcGraphDataSetProperty implements ArrayAccess
{
/**
* Default value for this property
*
* @var mixed
*/
protected $defaultValue;
/**
* Contains specified values for single dataset elements
*
* @var array
*/
protected $dataValue;
/**
* Contains a reference to the dataset to check for availability of data
* keys
*
* @var ezcGraphDataSet
*/
protected $dataset;
/**
* Abstract method to contain the check for validity of the value
*
* @param mixed $value
* @return void
*/
abstract protected function checkValue( &$value );
/**
* Constructor
*
* @param ezcGraphDataSet $dataset
* @ignore
* @return void
*/
public function __construct( ezcGraphDataSet $dataset )
{
$this->dataset = $dataset;
}
/**
* Set the default value for this property
*
* @param string $name Property name
* @param mixed $value Property value
* @return void
*/
public function __set( $name, $value )
{
if ( $name === 'default' &&
$this->checkValue( $value ) )
{
$this->defaultValue = $value;
}
}
/**
* Get the default value for this property
*
* @param string $name Property name
* @return mixed
*/
public function __get( $name )
{
if ( $name === 'default' )
{
return $this->defaultValue;
}
}
/**
* Returns if an option exists.
* Allows isset() using ArrayAccess.
*
* @param string $key The name of the option to get.
* @return bool Wether the option exists.
*/
final public function offsetExists( $key )
{
return isset( $this->dataset[$key] );
}
/**
* Returns an option value.
* Get an option value by ArrayAccess.
*
* @param string $key The name of the option to get.
* @return mixed The option value.
*
* @throws ezcBasePropertyNotFoundException
* If a the value for the property options is not an instance of
*/
final public function offsetGet( $key )
{
if ( isset( $this->dataValue[$key] ) )
{
return $this->dataValue[$key];
}
elseif ( isset( $this->dataset[$key] ) )
{
return $this->defaultValue;
}
else
{
throw new ezcGraphNoSuchDataException( $key );
}
}
/**
* Set an option.
* Sets an option using ArrayAccess.
*
* @param string $key The option to set.
* @param mixed $value The value for the option.
* @return void
*
* @throws ezcBasePropertyNotFoundException
* If a the value for the property options is not an instance of
* @throws ezcBaseValueException
* If a the value for a property is out of range.
*/
public function offsetSet( $key, $value )
{
if ( isset( $this->dataset[$key] ) &&
$this->checkValue( $value ) )
{
$this->dataValue[$key] = $value;
}
else
{
throw new ezcGraphNoSuchDataException( $key );
}
}
/**
* Unset an option.
* Unsets an option using ArrayAccess.
*
* @param string $key The options to unset.
* @return void
*
* @throws ezcBasePropertyNotFoundException
* If a the value for the property options is not an instance of
* @throws ezcBaseValueException
* If a the value for a property is out of range.
*/
final public function offsetUnset( $key )
{
if ( isset( $this->dataset[$key] ) )
{
unset( $this->dataValue[$key] );
}
else
{
throw new ezcGraphNoSuchDataException( $key );
}
}
}
?>
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