Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
namespace DDDBL;
/**
* a DataObject is a generic object
* to store data under given keys.
*
* it allows getting, adding, updating and deleting
* data.
*
* a validation callback can be provided
* to ensure, that the stored data
* validate correctly.
*
**/
class DataObject {
/**
* list of stored data
**/
private $arrData = array();
/**
* callback to validate all stored data
**/
private $cloValidator = null;
/**
* @param $cloValidator - optional validator callback to validate stored data
* @param $arrData - optional list of data to store in object
*
* @throws UnexpectedParameterTypeException - if validator callback is not a callable
*
* initiates the data-object and stores the validator callback. if no
* callback is given, a default callback is stored, which validates against
* everything.
*
* if optional data are given, they are passed to DataObject::add(), to be stored
* immediatley
*
**/
public function __construct($cloValidator = null, array $arrData = array()) {
if(!is_null($cloValidator) && !is_callable($cloValidator))
throw new UnexpectedParameterTypeException('callable', $cloValidator);
$this->cloValidator = (!is_null($cloValidator)) ? $cloValidator : function() {return true; };
if(!empty($arrData))
$this->add($arrData);
}
/**
* @param $arrData - list of data to store in object
*
* @throws \Exception - if a key is already in use
* @throws \Exception - if the final data-set do not validate
*
* add the list of data to the existing ones. the given data
* must have the following format:
* array([key] => data
* [key] => data, [..])
*
* if a key in the given data is already used in stored
* data the addition is aborted and an exception is
* thrown.
*
* the stored data are only modified on success
*
**/
public function add(array $arrData) {
$arrMergedData = array_merge($this->arrData, $arrData);
foreach($arrData AS $strKey => $mixData)
if(array_key_exists($strKey, $this->arrData))
throw new \Exception("could not store data, key is already in use: $strKey");
$cloValidator = $this->cloValidator;
if(!$cloValidator($arrMergedData))
throw new \Exception("given data do not validate");
$this->arrData = $arrMergedData;
}
/**
* @param $arrData - list of data to update
*
* @throws \Exception - if the final data-set do not validate
*
* update the stored data with the given data-set. for
* the structure of $arrData have a look at DataObject:add()
*
* existing keys are overwritten with new values. new
* keys are added to the data-set.
*
* if validation of final set fails, an exception is
* thrown. no data are modified on failure.
*
**/
public function update(array $arrData) {
$arrMergedData = array_merge($this->arrData, $arrData);
$cloValidator = $this->cloValidator;
if(!$cloValidator($arrMergedData))
throw new \Exception("given data do not validate");
$this->arrData = $arrMergedData;
}
/**
* @param $strKey - the key of the value to delete
*
* @throws UnexpectedParameterTypeException - if given key is not a string
*
* delete the value stored under the given key.
* if given key do not exists, nothing is done!
*
**/
public function delete($strKey) {
if(!is_string($strKey))
throw new UnexpectedParameterTypeException('string', $strKey);
if($this->exists($strKey))
unset($this->arrData[$strKey]);
}
/**
* @param $strKey - the key to check
*
* @throws UnexpectedParameterTypeException - if given key is not a string
*
* @return (boolean) true, if key exists
* @return (boolean) false, if key do not exists
*
* check if the given key exists
*
**/
public function exists($strKey) {
if(!is_string($strKey))
throw new UnexpectedParameterTypeException('string', $strKey);
if(!array_key_exists($strKey, $this->arrData))
return false;
return true;
}
/**
* @param $strKey - the key to get the value from
*
* @throws UnexpectedParameterTypeException - if given key is not a string
* @throws \Exception - if given key is unknown
*
* @return (mixed) the value stored under the given key
*
* return the value stored under the given key
*
**/
public function get($strKey) {
if(!is_string($strKey))
throw new UnexpectedParameterTypeException('string', $strKey);
if(!$this->exists($strKey))
throw new \Exception("unknown key: $strKey");
return $this->arrData[$strKey];
}
/**
* return all stored data in the structure of:
* array([key] => data
* [key] => data, [..])
*
**/
public function getAll() {
return $this->arrData;
}
}