Condition.php

1. 9.x drupal/core/lib/Drupal/Core/Database/Query/Condition.php
2. 9.x drupal/core/modules/field/modules/field_sql_storage/lib/Drupal/field_sql_storage/Entity/Condition.php

<?php

/**
 * @file
 * Definition of Drupal\field_sql_storage\Query\ConditionSql.
 */
namespace Drupal\field_sql_storage\Entity;

use Drupal\Core\Entity\Query\ConditionBase;
use Drupal\Core\Entity\Query\ConditionInterface;
use Drupal\Core\Database\Query\SelectInterface;
use Drupal\Core\Database\Query\Condition as SqlCondition;
class Condition extends ConditionBase {

  /**
   * Implements Drupal\Core\Entity\Query\ConditionInterface::compile().
   */
  public function compile($conditionContainer) {

    // If this is not the top level condition group then the sql query is
    // added to the $conditionContainer object by this function itself. The
    // SQL query object is only necessary to pass to Query::addField() so it
    // can join tables as necessary. On the other hand, conditions need to be
    // added to the $conditionContainer object to keep grouping.
    $sqlQuery = $conditionContainer instanceof SelectInterface ? $conditionContainer : $conditionContainer->sqlQuery;
    $tables = new Tables($sqlQuery);
    foreach ($this->conditions as $condition) {
      if ($condition['field'] instanceof ConditionInterface) {
        $sqlCondition = new SqlCondition($condition['field']
          ->getConjunction());

        // Add the SQL query to the object before calling this method again.
        $sqlCondition->sqlQuery = $sqlQuery;
        $condition['field']
          ->compile($sqlCondition);
        $sqlQuery
          ->condition($sqlCondition);
      }
      else {
        $type = strtoupper($this->conjunction) == 'OR' || $condition['operator'] == 'IS NULL' ? 'LEFT' : 'INNER';
        $this
          ->translateCondition($condition);
        $field = $tables
          ->addField($condition['field'], $type, $condition['langcode']);
        $conditionContainer
          ->condition($field, $condition['value'], $condition['operator']);
      }
    }
  }

  /**
   * Implements Drupal\Core\Entity\Query\ConditionInterface::exists().
   */
  public function exists($field, $langcode = NULL) {
    return $this
      ->condition($field, NULL, 'IS NOT NULL', $langcode);
  }

  /**
   * Implements Drupal\Core\Entity\Query\ConditionInterface::notExists().
   */
  public function notExists($field, $langcode = NULL) {
    return $this
      ->condition($field, NULL, 'IS NULL', $langcode);
  }
  protected function translateCondition(&$condition) {
    switch ($condition['operator']) {
      case 'STARTS_WITH':
        $condition['value'] .= '%';
        $condition['operator'] = 'LIKE';
        break;
      case 'CONTAINS':
        $condition['value'] = '%' . $condition['value'] . '%';
        $condition['operator'] = 'LIKE';
        break;
      case 'ENDS_WITH':
        $condition['value'] = '%' . $condition['value'];
        $condition['operator'] = 'LIKE';
        break;
    }
  }

}