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<?php |
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/** |
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* Manages {@link FakeObject} instances in a table-like storage with arbitrary keys. |
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* Enforces a unique identifier for each record, either manually set or created as a hash. |
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* Since it stores arbitrary key/value data, its main purpose is to provide |
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* lightweight object wrappers where no full ORM mapping exists, e.g. with transient |
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* data stored in and retrieved from webservices. |
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* |
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* The database is designed to be persisted as a flat file via json_encode() and json_decode(). |
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*/ |
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class FakeDatabase { |
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protected $path; |
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function __construct($path) { |
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$this->path = $path; |
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} |
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protected function getData() { |
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if(file_exists($this->path) && !is_readable($this->path)) { |
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throw new LogicException(sprintf('FakeDatabase at %s is not readable'. $this->path)); |
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} |
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if(file_exists($this->path)) { |
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$content = file_get_contents($this->path); |
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return $content ? json_decode(file_get_contents($this->path), true) : array(); |
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} else { |
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return array(); |
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} |
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} |
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protected function setData($data) { |
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if(file_exists($this->path) && !is_writable($this->path)) { |
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throw new LogicException(sprintf('FakeDatabase at %s is not writeable'. $this->path)); |
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} |
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$old = umask(0); |
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file_put_contents($this->path, json_encode($data, JSON_PRETTY_PRINT)); |
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chmod($this->path, 0777); |
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umask($old); |
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} |
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/** |
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* Finds a record matching a certain key/value set |
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* Not a terribly efficient implementation, since it retrieves all records from this type |
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* and searches in memory. Supports nested keys through dot notation. |
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*/ |
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public function find($type, $key, $value) { |
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$data = $this->getData(); |
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$return = null; |
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if(isset($data[$type])) { |
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$keyParts = explode('.', $key); |
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$records = $data[$type]; |
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foreach($records as $recordKey => $record) { |
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$compare = $record; |
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foreach($keyParts as $i => $keyPart) { |
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if($i < count($keyParts)) { |
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if(isset($compare[$keyPart])) { |
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$compare = $compare[$keyPart]; |
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} else { |
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continue; |
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} |
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} |
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} |
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if($compare == $value) { |
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$return = FakeObject::create_from_array($record); |
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} |
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} |
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} else { |
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$return = false; |
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} |
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// $this->log(sprintf( |
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// 'Find fake %s#%s: %s', |
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// $type, |
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// $key, |
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// json_encode($return) |
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// )); |
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return $return; |
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} |
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View Code Duplication |
public function get($type, $key) { |
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$data = $this->getData(); |
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$return = (isset($data[$type][$key])) ? FakeObject::create_from_array($data[$type][$key]) : null; |
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// $this->log(sprintf( |
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// 'Get fake %s#%s: %s', |
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// $type, |
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// $key, |
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// json_encode($return) |
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// )); |
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return $return; |
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} |
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View Code Duplication |
public function getAll($type) { |
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$data = $this->getData(); |
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if(!isset($data[$type])) return false; |
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$return = array(); |
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foreach($data[$type] as $record) { |
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$return[] = FakeObject::create_from_array($record); |
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} |
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return $return; |
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} |
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/** |
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* Sets a new record. Replaces existing records with the same key. |
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* Use {@link update()} for updating existing records. |
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* |
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* @param String $type |
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* @param String $key |
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* @param FakeObject $obj |
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*/ |
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public function set($type, $key, FakeObject $obj) { |
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$data = $this->getData(); |
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if(!isset($data[$type])) $data[$type] = array(); |
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$obj->_key = $key; |
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$record = $obj->toArray(); |
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$data[$type][(string)$key] = $record; |
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$this->setData($data); |
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// $this->log(sprintf( |
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// 'Set fake %s#%s: %s', |
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// $type, |
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// $key, |
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// json_encode($record) |
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// )); |
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} |
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/** |
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* Updates an existing record. Merges with existing data. |
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* Use {@link set()} to unset values. |
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* |
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* @param String $type |
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* @param String $key |
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* @param FakeObject $obj |
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*/ |
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public function update($type, $key, FakeObject $obj) { |
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$existing = $this->get($type, $key); |
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$record = $existing ? array_merge($existing->toArray(), $obj->toArray()) : $obj->toArray(); |
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$data = $this->getData(); |
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if(!isset($data[$type])) $data[$type] = array(); |
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$data[$type][$key] = $record; |
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$this->setData($data); |
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// $this->log(sprintf( |
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// 'Update fake %s#%s: %s', |
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// $type, |
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// $key, |
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// json_encode($record) |
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// )); |
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} |
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/** |
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* Since stores (SQLite tables) aren't tracked reliably across processes, |
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* we need to hard reset the DB and reinitialize it. |
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*/ |
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public function reset() { |
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if(file_exists($this->path)) { |
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unlink($this->path); |
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} |
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// $this->log('Reset'); |
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} |
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public function toArray() { |
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return $this->getData(); |
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} |
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public function getPath() { |
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return $this->path; |
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} |
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// protected function log($msg) { |
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// MysiteLog::log($msg, MysiteLog::INFO); |
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// } |
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} |
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class FakeDatabaseException extends Exception {} |
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Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.