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<?php |
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/** |
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* This file is part of Phuria SQL Builder package. |
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* |
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* Copyright (c) 2016 Beniamin Jonatan Šimko |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Phuria\QueryBuilder\Expression; |
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use Phuria\QueryBuilder\ExprBuilder; |
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/** |
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* @author Beniamin Jonatan Šimko <[email protected]> |
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*/ |
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class QueryClauseExpression implements ExpressionInterface |
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{ |
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const CLAUSE_WHERE = 'WHERE'; |
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const CLAUSE_SELECT = 'SELECT'; |
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const CLAUSE_ORDER_BY = 'ORDER BY'; |
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const CLAUSE_SET = 'SET'; |
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const CLAUSE_GROUP_BY = 'GROUP BY'; |
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const CLAUSE_HAVING = 'HAVING'; |
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/** |
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* @var string $clause |
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*/ |
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private $clause; |
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/** |
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* @var ExpressionInterface $wrappedExpression |
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*/ |
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private $wrappedExpression; |
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/** |
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* @var bool $quietWhenEmpty |
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*/ |
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private $quietWhenEmpty; |
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/** |
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* @param string $clause |
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* @param ExpressionInterface $expression |
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* @param bool $quietWhenEmpty |
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*/ |
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public function __construct($clause, ExpressionInterface $expression, $quietWhenEmpty = true) |
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{ |
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$this->clause = $clause; |
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$this->wrappedExpression = $expression; |
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$this->quietWhenEmpty = $quietWhenEmpty; |
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} |
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/** |
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* @return boolean |
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*/ |
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public function isQuietWhenEmpty() |
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{ |
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return $this->quietWhenEmpty; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isEmpty() |
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{ |
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$expr = $this->wrappedExpression; |
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if ($expr instanceof ExprBuilder) { |
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$expr = $expr->getWrappedExpression(); |
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} |
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if ($expr instanceof EmptyExpression) { |
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return true; |
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} |
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if ($expr instanceof ExpressionCollection && $expr->isEmpty()) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @return string |
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*/ |
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public function getClause() |
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{ |
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return $this->clause; |
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} |
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/** |
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* @return ExpressionInterface |
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*/ |
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public function getWrappedExpression() |
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{ |
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return $this->wrappedExpression; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function compile() |
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{ |
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if ($this->isQuietWhenEmpty() && $this->isEmpty()) { |
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return ''; |
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} else if ($this->isEmpty()) { |
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return $this->clause; |
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} |
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return $this->clause . ' ' . $this->wrappedExpression->compile(); |
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} |
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} |
phuria /
under-query
