301 lines
7.1 KiB
PHP
301 lines
7.1 KiB
PHP
<?php
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/**
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* A DataFormatter object handles transformation of data from SilverStripe model objects to a particular output format, and vice versa.
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* This is most commonly used in developing RESTful APIs.
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*
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* @package framework
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* @subpackage formatters
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*/
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abstract class DataFormatter extends Object {
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/**
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* Set priority from 0-100.
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* If multiple formatters for the same extension exist,
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* we select the one with highest priority.
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*
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* @var int
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*/
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public static $priority = 50;
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/**
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* Follow relations for the {@link DataObject} instances
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* ($has_one, $has_many, $many_many).
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* Set to "0" to disable relation output.
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*
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* @todo Support more than one nesting level
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*
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* @var int
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*/
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public $relationDepth = 1;
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/**
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* Allows overriding of the fields which are rendered for the
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* processed dataobjects. By default, this includes all
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* fields in {@link DataObject::inheritedDatabaseFields()}.
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*
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* @var array
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*/
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protected $customFields = null;
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/**
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* Allows addition of fields
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* (e.g. custom getters on a DataObject)
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*
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* @var array
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*/
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protected $customAddFields = null;
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/**
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* Allows to limit or add relations.
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* Only use in combination with {@link $relationDepth}.
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* By default, all relations will be shown.
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*
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* @var array
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*/
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protected $customRelations = null;
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/**
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* Fields which should be expicitly excluded from the export.
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* Comes in handy for field-level permissions.
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* Will overrule both {@link $customAddFields} and {@link $customFields}
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*
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* @var array
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*/
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protected $removeFields = null;
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/**
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* Specifies the mimetype in which all strings
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* returned from the convert*() methods should be used,
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* e.g. "text/xml".
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*
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* @var string
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*/
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protected $outputContentType = null;
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/**
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* Used to set totalSize properties on the output
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* of {@link convertDataObjectSet()}, shows the
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* total number of records without the "limit" and "offset"
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* GET parameters. Useful to implement pagination.
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*
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* @var int
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*/
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protected $totalSize;
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/**
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* Get a DataFormatter object suitable for handling the given file extension.
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*
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* @param string $extension
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* @return DataFormatter
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*/
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static function for_extension($extension) {
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$classes = ClassInfo::subclassesFor("DataFormatter");
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array_shift($classes);
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$sortedClasses = array();
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foreach($classes as $class) {
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$sortedClasses[$class] = singleton($class)->stat('priority');
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}
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arsort($sortedClasses);
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foreach($sortedClasses as $className => $priority) {
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$formatter = new $className();
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if(in_array($extension, $formatter->supportedExtensions())) {
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return $formatter;
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}
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}
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}
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/**
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* Get formatter for the first matching extension.
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*
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* @param array $extensions
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* @return DataFormatter
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*/
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static function for_extensions($extensions) {
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foreach($extensions as $extension) {
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if($formatter = self::for_extension($extension)) return $formatter;
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}
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return false;
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}
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/**
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* Get a DataFormatter object suitable for handling the given mimetype.
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*
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* @param string $mimeType
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* @return DataFormatter
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*/
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static function for_mimetype($mimeType) {
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$classes = ClassInfo::subclassesFor("DataFormatter");
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array_shift($classes);
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$sortedClasses = array();
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foreach($classes as $class) {
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$sortedClasses[$class] = singleton($class)->stat('priority');
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}
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arsort($sortedClasses);
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foreach($sortedClasses as $className => $priority) {
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$formatter = new $className();
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if(in_array($mimeType, $formatter->supportedMimeTypes())) {
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return $formatter;
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}
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}
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}
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/**
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* Get formatter for the first matching mimetype.
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* Useful for HTTP Accept headers which can contain
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* multiple comma-separated mimetypes.
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*
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* @param array $mimetypes
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* @return DataFormatter
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*/
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static function for_mimetypes($mimetypes) {
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foreach($mimetypes as $mimetype) {
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if($formatter = self::for_mimetype($mimetype)) return $formatter;
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}
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return false;
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}
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/**
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* @param array $fields
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*/
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public function setCustomFields($fields) {
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$this->customFields = $fields;
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}
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/**
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* @return array
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*/
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public function getCustomFields() {
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return $this->customFields;
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}
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/**
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* @param array $fields
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*/
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public function setCustomAddFields($fields) {
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$this->customAddFields = $fields;
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}
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/**
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* @param array $relations
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*/
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public function setCustomRelations($relations) {
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$this->customRelations = $relations;
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}
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/**
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* @return array
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*/
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public function getCustomRelations() {
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return $this->customRelations;
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}
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/**
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* @return array
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*/
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public function getCustomAddFields() {
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return $this->customAddFields;
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}
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/**
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* @param array $fields
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*/
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public function setRemoveFields($fields) {
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$this->removeFields = $fields;
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}
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/**
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* @return array
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*/
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public function getRemoveFields() {
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return $this->removeFields;
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}
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public function getOutputContentType() {
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return $this->outputContentType;
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}
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/**
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* @param int $size
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*/
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public function setTotalSize($size) {
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$this->totalSize = (int)$size;
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}
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/**
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* @return int
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*/
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public function getTotalSize() {
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return $this->totalSize;
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}
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/**
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* Returns all fields on the object which should be shown
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* in the output. Can be customised through {@link self::setCustomFields()}.
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*
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* @todo Allow for custom getters on the processed object (currently filtered through inheritedDatabaseFields)
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* @todo Field level permission checks
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*
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* @param DataObject $obj
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* @return array
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*/
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protected function getFieldsForObj($obj) {
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$dbFields = array();
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// if custom fields are specified, only select these
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if(is_array($this->customFields)) {
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foreach($this->customFields as $fieldName) {
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// @todo Possible security risk by making methods accessible - implement field-level security
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if($obj->hasField($fieldName) || $obj->hasMethod("get{$fieldName}")) $dbFields[$fieldName] = $fieldName;
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}
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} else {
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// by default, all database fields are selected
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$dbFields = $obj->inheritedDatabaseFields();
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}
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if(is_array($this->customAddFields)) {
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foreach($this->customAddFields as $fieldName) {
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// @todo Possible security risk by making methods accessible - implement field-level security
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if($obj->hasField($fieldName) || $obj->hasMethod("get{$fieldName}")) $dbFields[$fieldName] = $fieldName;
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}
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}
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// add default required fields
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$dbFields = array_merge($dbFields, array('ID'=>'Int'));
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// @todo Requires PHP 5.1+
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if(is_array($this->removeFields)) {
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$dbFields = array_diff_key($dbFields, array_combine($this->removeFields,$this->removeFields));
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}
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return $dbFields;
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}
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/**
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* Return an array of the extensions that this data formatter supports
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*/
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abstract function supportedExtensions();
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abstract function supportedMimeTypes();
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/**
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* Convert a single data object to this format. Return a string.
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*/
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abstract function convertDataObject(DataObjectInterface $do);
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/**
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* Convert a data object set to this format. Return a string.
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*/
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abstract function convertDataObjectSet(SS_List $set);
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/**
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* @param string $strData HTTP Payload as string
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*/
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public function convertStringToArray($strData) {
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user_error('DataFormatter::convertStringToArray not implemented on subclass', E_USER_ERROR);
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}
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}
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