silverstripe-framework/core/model/DataObjectDecorator.php

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<?php
/**
* Plug-ins for additional functionality in your DataObjects
*
* DataObject decorators add extra functionality to your data objects.
* @package sapphire
* @subpackage model
*/
abstract class DataObjectDecorator extends Extension {
/**
* Statics on a {@link DataObject} subclass
* which can be decorated onto. This list is
* limited for security and performance reasons.
*
* @var array
*/
protected static $decoratable_statics = array(
'db',
'has_one',
'indexes',
'defaults',
'has_many',
'many_many',
'belongs_many_many',
'many_many_extraFields',
'searchable_fields',
);
/**
* Load the extra database fields defined in extraDBFields.
*
* @todo Rename to "loadExtraStaticFields", as it decorates more than database related fields.
*/
function loadExtraDBFields() {
// Don't apply DB fields if the parent object has this extension too
if(singleton(get_parent_class($this->owner))->extInstance($this->class)) return;
$fields = $this->extraDBFields();
$className = $this->owner->class;
if($fields) {
foreach($fields as $relationType => $fields) {
if(in_array($relationType, self::$decoratable_statics)) {
eval("$className::\$$relationType = array_merge((array){$className}::\$$relationType, (array)\$fields);");
$this->owner->set_stat($relationType, eval("return $className::\$$relationType;"));
}
$this->owner->set_uninherited('fieldExists', null);
}
}
}
/**
* Edit the given query object to support queries for this extension
*
* @param SQLQuery $query Query to augment.
*/
function augmentSQL(SQLQuery &$query) {
}
/**
* Update the database schema as required by this extension.
*/
function augmentDatabase() {
}
/**
* Augment a write-record request.
*
* @param SQLQuery $manipulation Query to augment.
*/
function augmentWrite(&$manipulation) {
}
/**
* Define extra database fields
*
* Return a map where the keys are db, has_one, etc, and the values are
* additional fields/relations to be defined.
*
* Note: please ensure that the static variable that you are overloading is explicitly defined on the class that
* you are extending. For example, we have added static $has_one = array() to the Member definition, so that we
* can add has_one relationships to Member with decorators.
*
* If you forget to do this, db/build won't create the new relation. Don't blame us, blame PHP! ;-)
*
* @return array Returns a map where the keys are db, has_one, etc, and
* the values are additional fields/relations to be defined.
*/
function extraDBFields() {
return array();
}
/**
* This function is used to provide modifications to the form in the CMS
* by the decorator.
* By default, no changes are made - if you want you can overload this
* function.
*
* @param FieldSet $fields The FieldSet to modify.
*/
function updateCMSFields(FieldSet &$fields) {
}
/**
* this function is used to provide modifications to the summary fields in CMS
* by the decorator
* By default, the summaryField() of its owner will merge more fields defined in the decorator's
* $extra_fields['summary_fields']
*/
function updateSummaryFields(&$fields){
$extra_fields = $this->extraDBFields();
$summary_fields = $extra_fields['summary_fields'];
if($summary_fields)$fields = array_merge($fields, $summary_fields);
}
function updateSummaryFieldsExcludeExtra(&$fields){
$extra_fields = $this->extraDBFields();
$summary_fields = $extra_fields['summary_fields'];
if($summary_fields)$fields = array_merge($fields, $summary_fields);
}
}
?>