mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-08-27 21:15:40 +02:00
423 lines
12 KiB
PHP
423 lines
12 KiB
PHP
<?php
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/**
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* A base for bulk loaders of content into the SilverStripe database.
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* Bulk loaders give SilverStripe authors the ability to do large-scale uploads into their SilverStripe databases.
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*
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* You can configure column-handling,
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*
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* @todo Add support for adding/editing has_many relations.
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* @todo Add support for deep chaining of relation properties (e.g. Player.Team.Stats.GoalCount)
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* @todo Character conversion
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*
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* @see http://tools.ietf.org/html/rfc4180
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* @package framework
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* @subpackage bulkloading
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* @author Ingo Schommer, Silverstripe Ltd. (<firstname>@silverstripe.com)
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*/
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abstract class BulkLoader extends ViewableData {
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/**
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* Each row in the imported dataset should map to one instance
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* of this class (with optional property translation
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* through {@self::$columnMaps}.
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*
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* @var string
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*/
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public $objectClass;
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/**
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* Override this on subclasses to give the specific functions names.
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*
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* @var string
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*/
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public static $title;
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/**
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* Map columns to DataObject-properties.
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* If not specified, we assume the first row
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* in the file contains the column headers.
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* The order of your array should match the column order.
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*
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* The column count should match the count of array elements,
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* fill with NULL values if you want to skip certain columns.
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*
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* You can also combine {@link $hasHeaderRow} = true and {@link $columnMap}
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* and omit the NULL values in your map.
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*
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* Supports one-level chaining of has_one relations and properties with dot notation
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* (e.g. Team.Title). The first part has to match a has_one relation name
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* (not necessarily the classname of the used relation).
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*
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* <code>
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* <?php
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* // simple example
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* array(
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* 'Title',
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* 'Birthday'
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* )
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*
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* // complex example
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* array(
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* 'first name' => 'FirstName', // custom column name
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* null, // ignored column
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* 'RegionID', // direct has_one/has_many ID setting
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* 'OrganisationTitle', // create has_one relation to existing record using $relationCallbacks
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* 'street' => 'Organisation.StreetName', // match an existing has_one or create one and write property.
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* );
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* ?>
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* </code>
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*
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* @var array
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*/
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public $columnMap = array();
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/**
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* Find a has_one relation based on a specific column value.
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*
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* <code>
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* <?php
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* array(
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* 'OrganisationTitle' => array(
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* 'relationname' => 'Organisation', // relation accessor name
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* 'callback' => 'getOrganisationByTitle',
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* );
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* );
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* ?>
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* </code>
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*
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* @var array
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*/
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public $relationCallbacks = array();
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/**
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* Specifies how to determine duplicates based on one or more provided fields
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* in the imported data, matching to properties on the used {@link DataObject} class.
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* Alternatively the array values can contain a callback method (see example for
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* implementation details). The callback method should be defined on the source class.
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*
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* NOTE: If you're trying to get a unique Member record by a particular field that
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* isn't Email, you need to ensure that Member is correctly set to the unique field
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* you want, as it will merge any duplicates during {@link Member::onBeforeWrite()}.
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*
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* {@see Member::$unique_identifier_field}.
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*
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* If multiple checks are specified, the first non-empty field "wins".
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*
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* <code>
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* <?php
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* array(
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* 'customernumber' => 'ID',
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* 'phonenumber' => array(
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* 'callback' => 'getByImportedPhoneNumber'
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* )
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* );
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* ?>
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* </code>
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*
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* @var array
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*/
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public $duplicateChecks = array();
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/**
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* @var Boolean $clearBeforeImport Delete ALL records before importing.
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*/
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public $deleteExistingRecords = false;
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public function __construct($objectClass) {
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$this->objectClass = $objectClass;
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parent::__construct();
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}
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/*
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* Load the given file via {@link self::processAll()} and {@link self::processRecord()}.
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* Optionally truncates (clear) the table before it imports.
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*
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* @return BulkLoader_Result See {@link self::processAll()}
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*/
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public function load($filepath) {
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increase_time_limit_to(3600);
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increase_memory_limit_to('512M');
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//get all instances of the to be imported data object
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if($this->deleteExistingRecords) {
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DataObject::get($this->objectClass)->removeAll();
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}
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return $this->processAll($filepath);
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}
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/**
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* Preview a file import (don't write anything to the database).
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* Useful to analyze the input and give the users a chance to influence
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* it through a UI.
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*
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* @todo Implement preview()
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*
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* @param string $filepath Absolute path to the file we're importing
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* @return array See {@link self::processAll()}
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*/
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public function preview($filepath) {
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user_error("BulkLoader::preview(): Not implemented", E_USER_ERROR);
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}
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/**
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* Process every record in the file
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*
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* @param string $filepath Absolute path to the file we're importing (with UTF8 content)
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* @param boolean $preview If true, we'll just output a summary of changes but not actually do anything
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* @return BulkLoader_Result A collection of objects which are either created, updated or deleted.
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* 'message': free-text string that can optionally provide some more information about what changes have
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*/
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abstract protected function processAll($filepath, $preview = false);
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/**
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* Process a single record from the file.
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*
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* @param array $record An map of the data, keyed by the header field defined in {@link self::$columnMap}
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* @param array $columnMap
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* @param $result BulkLoader_Result (passed as reference)
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* @param boolean $preview
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*/
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abstract protected function processRecord($record, $columnMap, &$result, $preview = false);
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/**
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* Return a FieldList containing all the options for this form; this
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* doesn't include the actual upload field itself
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*/
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public function getOptionFields() {}
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/**
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* Return a human-readable name for this object.
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* It defaults to the class name can be overridden by setting the static variable $title
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*
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* @return string
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*/
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public function Title() {
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return ($title = $this->stat('title')) ? $title : $this->class;
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}
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/**
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* Get a specification of all available columns and relations on the used model.
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* Useful for generation of spec documents for technical end users.
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*
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* Return Format:
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* <code>
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* array(
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* 'fields' => array('myFieldName'=>'myDescription'),
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* 'relations' => array('myRelationName'=>'myDescription'),
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* )
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* </code>
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*
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* @todo Mix in custom column mappings
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*
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* @return array
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**/
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public function getImportSpec() {
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$spec = array();
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// get database columns (fieldlabels include fieldname as a key)
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// using $$includerelations flag as false, so that it only contain $db fields
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$spec['fields'] = (array)singleton($this->objectClass)->fieldLabels(false);
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$has_ones = singleton($this->objectClass)->hasOne();
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$has_manys = singleton($this->objectClass)->hasMany();
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$many_manys = singleton($this->objectClass)->manyMany();
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$spec['relations'] = (array)$has_ones + (array)$has_manys + (array)$many_manys;
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return $spec;
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}
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/**
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* Determines if a specific field is null.
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* Can be useful for unusual "empty" flags in the file,
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* e.g. a "(not set)" value.
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* The usual {@link DBField::isNull()} checks apply when writing the {@link DataObject},
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* so this is mainly a customization method.
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*
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* @param mixed $val
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* @param string $field Name of the field as specified in the array-values for {@link self::$columnMap}.
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* @return boolean
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*/
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protected function isNullValue($val, $fieldName = null) {
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return (empty($val) && $val !== '0');
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}
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}
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/**
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* Encapsulates the result of a {@link BulkLoader} import
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* (usually through the {@link BulkLoader->processAll()} method).
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*
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* @todo Refactor to support lazy-loaded DataObjectSets once they are implemented.
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*
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* @package framework
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* @subpackage bulkloading
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* @author Ingo Schommer, Silverstripe Ltd. (<firstname>@silverstripe.com)
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*/
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class BulkLoader_Result extends Object {
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/**
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* @var array Stores a map of ID and ClassNames
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* which can be reconstructed to DataObjects.
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* As imports can get large we just store enough
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* information to reconstruct the objects on demand.
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* Optionally includes a status message specific to
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* the import of this object. This information is stored
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* in a custom object property "_BulkLoaderMessage".
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*
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* Example:
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* <code>
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* array(array('ID'=>1, 'ClassName'=>'Member', 'Message'=>'Updated existing record based on ParentID relation'))
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* </code>
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*/
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protected $created = array();
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/**
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* @var array (see {@link $created})
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*/
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protected $updated = array();
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/**
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* @var array (see {@link $created})
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*/
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protected $deleted = array();
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/**
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* Stores the last change.
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* It is in the same format as {@link $created} but with an additional key, "ChangeType", which will be set to
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* one of 3 strings: "created", "updated", or "deleted"
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*/
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protected $lastChange = array();
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/**
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* Returns the count of all objects which were
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* created or updated.
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*
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* @return int
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*/
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public function Count() {
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return count($this->created) + count($this->updated);
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}
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/**
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* @return int
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*/
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public function CreatedCount() {
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return count($this->created);
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}
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/**
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* @return int
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*/
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public function UpdatedCount() {
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return count($this->updated);
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}
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/**
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* @return int
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*/
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public function DeletedCount() {
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return count($this->deleted);
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}
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/**
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* Returns all created objects. Each object might
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* contain specific importer feedback in the "_BulkLoaderMessage" property.
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*
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* @return ArrayList
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*/
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public function Created() {
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return $this->mapToArrayList($this->created);
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}
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/**
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* @return ArrayList
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*/
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public function Updated() {
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return $this->mapToArrayList($this->updated);
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}
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/**
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* @return ArrayList
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*/
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public function Deleted() {
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return $this->mapToArrayList($this->deleted);
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}
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/**
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* Returns the last change.
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* It is in the same format as {@link $created} but with an additional key, "ChangeType", which will be set to
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* one of 3 strings: "created", "updated", or "deleted"
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*/
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public function LastChange() {
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return $this->lastChange;
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}
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/**
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* @param $obj DataObject
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* @param $message string
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*/
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public function addCreated($obj, $message = null) {
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$this->created[] = $this->lastChange = array(
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'ID' => $obj->ID,
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'ClassName' => $obj->class,
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'Message' => $message
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);
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$this->lastChange['ChangeType'] = 'created';
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}
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/**
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* @param $obj DataObject
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* @param $message string
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*/
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public function addUpdated($obj, $message = null) {
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$this->updated[] = $this->lastChange = array(
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'ID' => $obj->ID,
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'ClassName' => $obj->class,
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'Message' => $message
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);
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$this->lastChange['ChangeType'] = 'updated';
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}
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/**
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* @param $obj DataObject
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* @param $message string
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*/
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public function addDeleted($obj, $message = null) {
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$this->deleted[] = $this->lastChange = array(
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'ID' => $obj->ID,
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'ClassName' => $obj->class,
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'Message' => $message
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);
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$this->lastChange['ChangeType'] = 'deleted';
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}
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/**
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* @param $arr Array containing ID and ClassName maps
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* @return ArrayList
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*/
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protected function mapToArrayList($arr) {
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$set = new ArrayList();
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foreach($arr as $arrItem) {
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$obj = DataObject::get_by_id($arrItem['ClassName'], $arrItem['ID']);
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$obj->_BulkLoaderMessage = $arrItem['Message'];
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if($obj) $set->push($obj);
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}
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return $set;
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}
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/**
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* Merges another BulkLoader_Result into this one.
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*
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* @param BulkLoader_Result $other
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*/
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public function merge(BulkLoader_Result $other) {
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$this->created = array_merge($this->created, $other->created);
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$this->updated = array_merge($this->updated, $other->updated);
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$this->deleted = array_merge($this->deleted, $other->deleted);
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}
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}
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