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<?php
/**
* File containing the abstract ezcGraphChartDataContainer class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005-2007 eZ systems as. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* Container class for datasets used by the chart classes. Implements usefull
* interfaces for convenient access to the datasets.
*
* @package Graph
*/
class ezcGraphChartDataContainer implements ArrayAccess, Iterator, Countable
{
/**
* Contains the data of a chart
*
* @var array(ezcGraphDataSet)
*/
protected $data = array();
/**
* Chart using this data set storage
*
* @var ezcGraphChart
*/
protected $chart;
public function __construct( ezcGraphChart $chart )
{
$this->chart = $chart;
}
/**
* Adds a dataset to the charts data
*
* @param string $name Name of dataset
* @param mixed $values Values to create dataset with
* @throws ezcGraphTooManyDataSetExceptions
* If too many datasets are created
* @return ezcGraphDataSet
*/
protected function addDataSet( $name, ezcGraphDataSet $dataSet )
{
$this->data[$name] = $dataSet;
$this->data[$name]->label = $name;
$this->data[$name]->palette = $this->chart->palette;
$this->data[$name]->displayType = $this->chart->getDefaultDisplayType();
}
/**
* Returns if the given offset exists.
*
* This method is part of the ArrayAccess interface to allow access to the
* data of this object as if it was an array.
*
* @param string $key Identifier of dataset.
* @return bool True when the offset exists, otherwise false.
*/
public function offsetExists( $key )
{
return isset( $this->data[$key] );
}
/**
* Returns the element with the given offset.
*
* This method is part of the ArrayAccess interface to allow access to the
* data of this object as if it was an array.
*
* @param string $key Identifier of dataset.
* @return ezcGraphDataSet
*
* @throws ezcGraphNoSuchDataSetException
* If no dataset with identifier exists
*/
public function offsetGet( $key )
{
if ( !isset( $this->data[$key] ) )
{
throw new ezcGraphNoSuchDataSetException( $key );
}
return $this->data[$key];
}
/**
* Set the element with the given offset.
*
* This method is part of the ArrayAccess interface to allow access to the
* data of this object as if it was an array.
*
* @param string $key Identifier of dataset
* @param ezcGraphDataSet$value The dataset to assign.
* @return void
*
* @throws ezcBaseValueException
* If supplied value is not an ezcGraphDataSet
*/
public function offsetSet( $key, $value )
{
if ( !$value instanceof ezcGraphDataSet )
{
throw new ezcBaseValueException( $key, $value, 'ezcGraphDataSet' );
}
return $this->addDataSet( $key, $value );
}
/**
* Unset the element with the given offset.
*
* This method is part of the ArrayAccess interface to allow access to the
* data of this object as if it was an array.
*
* @param int $offset The offset to unset the value for.
* @return void
*/
public function offsetUnset( $key )
{
if ( !isset( $this->data[$key] ) )
{
throw new ezcGraphNoSuchDataSetException( $key );
}
unset( $this->data[$key] );
}
/**
* Returns the currently selected dataset.
*
* This method is part of the Iterator interface to allow access to the
* datasets of this row by iterating over it like an array (e.g. using
* foreach).
*
* @return ezcGraphDataSet The currently selected dataset.
*/
public function current()
{
return current( $this->data );
}
/**
* Returns the next dataset and selects it or false on the last dataset.
*
* This method is part of the Iterator interface to allow access to the
* datasets of this row by iterating over it like an array (e.g. using
* foreach).
*
* @return mixed ezcGraphDataSet if the next dataset exists, or false.
*/
public function next()
{
return next( $this->data );
}
/**
* Returns the key of the currently selected dataset.
*
* This method is part of the Iterator interface to allow access to the
* datasets of this row by iterating over it like an array (e.g. using
* foreach).
*
* @return int The key of the currently selected dataset.
*/
public function key()
{
return key( $this->data );
}
/**
* Returns if the current dataset is valid.
*
* This method is part of the Iterator interface to allow access to the
* datasets of this row by iterating over it like an array (e.g. using
* foreach).
*
* @return bool If the current dataset is valid
*/
public function valid()
{
return ( current( $this->data ) !== false );
}
/**
* Selects the very first dataset and returns it.
* This method is part of the Iterator interface to allow access to the
* datasets of this row by iterating over it like an array (e.g. using
* foreach).
*
* @return ezcGraphDataSet The very first dataset.
*/
public function rewind()
{
return reset( $this->data );
}
/**
* Returns the number of datasets in the row.
*
* This method is part of the Countable interface to allow the usage of
* PHP's count() function to check how many datasets exist.
*
* @return int Number of datasets.
*/
public function count()
{
return count( $this->data );
}
}
?>
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