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vendor/yiisoft/yii2/db/conditions/ExistsCondition.php

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+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\db\conditions;
+
+use yii\base\InvalidArgumentException;
+use yii\db\Query;
+
+/**
+ * Condition that represents `EXISTS` operator.
+ *
+ * @author Dmytro Naumenko <d.naumenko.a@gmail.com>
+ * @since 2.0.14
+ */
+class ExistsCondition implements ConditionInterface
+{
+    /**
+     * @var string $operator the operator to use (e.g. `EXISTS` or `NOT EXISTS`)
+     */
+    private $operator;
+    /**
+     * @var Query the [[Query]] object representing the sub-query.
+     */
+    private $query;
+
+
+    /**
+     * ExistsCondition constructor.
+     *
+     * @param string $operator the operator to use (e.g. `EXISTS` or `NOT EXISTS`)
+     * @param Query $query the [[Query]] object representing the sub-query.
+     */
+    public function __construct($operator, $query)
+    {
+        $this->operator = $operator;
+        $this->query = $query;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function fromArrayDefinition($operator, $operands)
+    {
+        if (!isset($operands[0]) || !$operands[0] instanceof Query) {
+            throw new InvalidArgumentException('Subquery for EXISTS operator must be a Query object.');
+        }
+
+        return new static($operator, $operands[0]);
+    }
+
+    /**
+     * @return string
+     */
+    public function getOperator()
+    {
+        return $this->operator;
+    }
+
+    /**
+     * @return Query
+     */
+    public function getQuery()
+    {
+        return $this->query;
+    }
+}