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<?php |
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/****************************************************************************** |
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* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP. |
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* |
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* Copyright (c) 2016, 2015 Richard Klees <[email protected]> |
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* |
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* This software is licensed under The MIT License. You should have received |
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* a copy of the license along with the code. |
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*/ |
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namespace Lechimp\Dicto\DB; |
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use Lechimp\Dicto\Indexer\Insert; |
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/** |
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* Reads in an sql IndexDB to another Index. |
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*/ |
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class IndexDBReader { |
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/** |
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* @var array |
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*/ |
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protected $tables; |
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/** |
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* Lists of fields that contain an id. |
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* |
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* @var array<string,int> |
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*/ |
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protected $id_fields; |
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/** |
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* List of all fields that contain an integer. |
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* |
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* @var array<string,0> |
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*/ |
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protected $int_fields; |
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/** |
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* @var \Closure |
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*/ |
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protected $get_query_builder; |
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/** |
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* @var Insert |
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*/ |
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protected $other; |
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/** |
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* @var array<int|null,mixed>|null |
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*/ |
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protected $id_map = null; |
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/** |
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* @var array|null |
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*/ |
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protected $results = null; |
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/** |
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* @var bool |
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*/ |
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protected $already_run; |
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/** |
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* @param array $tables list of tables and fields according to IndexDB |
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* @param array $id_fields list of fields that contain a id |
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* @param array $int_fields list of fields that contain an int |
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* @param \Closure $get_query_builder to get a QueryBuilder |
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*/ |
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public function __construct($tables, $id_fields, $int_fields, \Closure $get_query_builder, Insert $insert) { |
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$this->tables = $tables; |
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$this->id_fields = $id_fields; |
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$this->int_fields = $int_fields; |
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$this->get_query_builder = $get_query_builder; |
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$this->other = $insert; |
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$this->already_run = false; |
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} |
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/** |
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* Read the index from the database and put it to insert. |
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*/ |
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public function run() { |
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assert('!$this->already_run'); |
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$this->id_map = [null => null]; |
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$this->results = $this->build_results_with_id(); |
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$inserts = $this->get_inserts(); |
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$this->write_inserts($inserts); |
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$this->already_run = true; |
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} |
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/** |
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* Builds a list of inserts ordered by the id. |
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* |
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* @return \Iterator $table => $values |
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*/ |
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protected function get_inserts() { |
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$count = count($this->results); |
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$i = 0; |
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$expected_id = 0; |
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// TODO: This will loop forever if there are (unexpected) holes |
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// in the sequence of ids. |
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while ($count > 0) { |
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if ($i >= $count) { |
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$i = 0; |
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} |
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$current_res = $this->results[$i][1]; |
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if ($current_res !== null) { |
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if ($current_res["id"] != $expected_id) { |
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$i++; |
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continue; |
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} |
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$this->transform_results($current_res); |
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yield $this->results[$i][0] => $current_res; |
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$this->results[$i][1] = null; |
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$expected_id++; |
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} |
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$res = $this->results[$i][2]->fetch(); |
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if ($res) { |
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$this->results[$i][1] = $res; |
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} |
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else { |
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$count--; |
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unset($this->results[$i]); |
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$this->results = array_values($this->results); |
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} |
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} |
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$rs = $this->select_all_from("relations"); |
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while ($res = $rs->fetch()) { |
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$this->transform_results($res); |
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yield "relations" => $res; |
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} |
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} |
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/** |
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* Initialize all tables that contain an id with their results. |
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* |
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* @return array[] containing [$table_name, null, $results] |
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*/ |
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protected function build_results_with_id() { |
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$results = []; |
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foreach ($this->tables as $key => $_) { |
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if ($key == "relations") { |
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continue; |
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} |
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$results[] = [$key, null, $this->select_all_from($key)]; |
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} |
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return $results; |
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} |
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/** |
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* @param string $table |
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* @return \Iterator |
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*/ |
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protected function select_all_from($table) { |
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$get_query_builder = $this->get_query_builder; |
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return $get_query_builder() |
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->select($this->tables[$table][1]) |
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->from($table) |
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->execute(); |
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} |
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/** |
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* Transforms results as retreived from sql to their appropriate internal |
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* representation. |
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* |
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* TODO: Unrolling this loop might make things faster. |
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* |
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* @param array &$results from database |
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* @return array |
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*/ |
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protected function transform_results(array &$results) { |
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foreach (array_keys($results) as $field) { |
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if (isset($this->id_fields[$field])) { |
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$results[$field] = $this->id_map[$results[$field]]; |
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} |
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else if (isset($this->int_fields[$field])) { |
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$results[$field] = (int)$results[$field]; |
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} |
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} |
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} |
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/** |
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* @param \Iterator $inserts |
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* @return null |
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*/ |
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protected function write_inserts(\Iterator $inserts) { |
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foreach ($inserts as $table => $insert) { |
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assert('array_key_exists($table, $this->tables)'); |
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$method = $this->tables[$table][0]; |
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if (isset($insert["id"])) { |
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$id = $insert["id"]; |
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unset($insert["id"]); |
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$this->id_map[$id] = call_user_func_array([$this->other, $method], $insert); |
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} |
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else { |
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call_user_func_array([$this->other, $method], $insert); |
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} |
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} |
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} |
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} |
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lechimp-p /
dicto.php
