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<?php
/**
* Stores a set of data, allowing checksums and access by keys
*/
class TCO_Coalescence_Entity {
protected $data;
protected $keys;
protected $checksums = array();
/**
* Create this entity assigning its data
* @param array $data keys/values
*/
public function __construct( $data ) {
$this->data = $data;
$this->keys = array_keys( $data );
}
/**
* Get a subset of data by a list of keys
* @param array $keys Keys to return
* @return array Filtered data
*/
public function get_data( $keys = array() ) {
return array_intersect_key( $this->data, array_flip( $keys ) );
}
/**
* Returns true when this entity's $data represents all keys in $keys
* @param array $keys Keys to check the existence for
* @return boolean
*/
public function has_keys( $keys = array() ) {
return count( array_intersect( $this->keys, $keys ) ) === count( $keys );
}
/**
* Create a checksum to uniquely identity data from a set of keys
* @param array $keys Keys to consider when making the checksum
* @return int checksum
*/
public function checksum( $keys = array() ) {
$key = implode('_', $keys);
if ( ! isset( $this->checksums[$key] ) ) {
$this->checksums[$key] = crc32( serialize( $this->get_data( $keys ) ) );
}
return $this->checksums[$key];
}
}