110 lines
2.7 KiB
PHP
110 lines
2.7 KiB
PHP
<?php
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/**
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* @file
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* Definition for a migration group.
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*/
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class MigrateGroup {
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/**
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* The name of the group - used to identify it in drush commands.
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*
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* @var string
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*/
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protected $name;
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public function getName() {
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return $this->name;
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}
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/**
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* List of groups this group is dependent on.
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*
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* @var array
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*/
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protected $dependencies = array();
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public function getDependencies() {
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return $this->dependencies;
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}
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/**
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* The central list of all known groups, keyed by group name.
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*
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* @var array
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*/
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static protected $groupList = array();
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static public function groups() {
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$groups = array();
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$dependent_groups = array();
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$required_groups = array();
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foreach (self::$groupList as $name => $group) {
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$dependencies = $group->getDependencies();
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if (count($dependencies) > 0) {
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// Set groups with dependencies aside for reordering
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$dependent_groups[$name] = $group;
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$required_groups += $dependencies;
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}
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else {
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// No dependencies, just add
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$groups[$name] = $group;
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}
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}
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$iterations = 0;
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while (count($dependent_groups) > 0) {
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if ($iterations++ > 20) {
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$group_names = implode(',', array_keys($dependent_groups));
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throw new MigrateException(t('Failure to sort migration list - most likely due ' .
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'to circular dependencies involving groups !group_names',
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array('!group_names' => $group_names)));
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}
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foreach ($dependent_groups as $name => $group) {
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$ready = TRUE;
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// Scan all the dependencies for this group and make sure they're all
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// in the final list
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foreach ($group->getDependencies() as $dependency) {
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if (!isset($groups[$dependency])) {
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$ready = FALSE;
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break;
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}
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}
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if ($ready) {
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// Yes they are! Move this group to the final list
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$groups[$name] = $group;
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unset($dependent_groups[$name]);
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}
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}
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}
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return $groups;
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}
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/**
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* Basic constructor.
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*
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* @param string $name
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* Group name.
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*
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* @param array $dependencies
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* List of dependent groups.
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*/
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public function __construct($name, $dependencies = array()) {
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$this->name = $name;
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$this->dependencies = $dependencies;
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}
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/**
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* Retrieve (creating if necessary) an instance of the named group.
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*
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* @param string $name
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* Group name.
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*
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* @param array $dependencies
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* List of dependent groups.
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*/
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static public function getInstance($name, $dependencies = array()) {
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if (empty(self::$groupList[$name])) {
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self::$groupList[$name] = new MigrateGroup($name, $dependencies);
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}
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return self::$groupList[$name];
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}
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}
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