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<?php |
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namespace Charcoal\Source\Database; |
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use UnexpectedValueException; |
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// From 'charcoal-core' |
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use Charcoal\Source\Database\DatabaseExpressionInterface; |
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use Charcoal\Source\DatabaseSource; |
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use Charcoal\Source\Order; |
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/** |
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* SQL Order Expression |
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* |
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* Priority of SQL resolution if the expression is "active": |
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* 1. Random — If "mode" is set to "rand". |
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* 2. Custom — If "condition" is defined or "mode" set to "custom". |
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* 3. Values — If "property" and "values" are defined or "mode" set to "values". |
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* 4. Direction — If "property" is defined. |
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*/ |
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class DatabaseOrder extends Order implements |
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DatabaseExpressionInterface |
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{ |
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/** |
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* The table related to the field identifier. |
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* |
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* @var string |
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*/ |
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protected $table = DatabaseSource::DEFAULT_TABLE_ALIAS; |
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/** |
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* Retrieve the default values for sorting. |
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* |
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* @return array |
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*/ |
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public function defaultData() |
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{ |
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$defaults = parent::defaultData(); |
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$defaults['table'] = DatabaseSource::DEFAULT_TABLE_ALIAS; |
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return $defaults; |
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} |
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/** |
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* Converts the order into a SQL expression for the ORDER BY clause. |
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* |
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* @return string A SQL string fragment. |
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*/ |
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public function sql() |
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{ |
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if ($this->active()) { |
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switch ($this->mode()) { |
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case self::MODE_RANDOM: |
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return $this->byRandom(); |
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case self::MODE_CUSTOM: |
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return $this->byCondition(); |
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case self::MODE_VALUES: |
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return $this->byValues(); |
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} |
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if ($this->hasCondition()) { |
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return $this->byCondition(); |
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} |
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if ($this->hasValues()) { |
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return $this->byValues(); |
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} |
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if ($this->hasProperty()) { |
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return $this->byProperty(); |
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} |
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} |
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return ''; |
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} |
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/** |
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* Retrieve the ORDER BY clause for the {@see self::MODE_RANDOM} mode. |
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* |
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* @return string |
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*/ |
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protected function byRandom() |
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{ |
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return 'RAND()'; |
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} |
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/** |
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* Generate the ORDER BY clause(s) for the direction mode. |
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* |
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* @throws UnexpectedValueException If any required property is empty. |
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* @return string |
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*/ |
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protected function byProperty() |
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{ |
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$fields = $this->fieldIdentifiers(); |
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if (empty($fields)) { |
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throw new UnexpectedValueException( |
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'Property is required.' |
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); |
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} |
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$dir = $this->direction(); |
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$dir = $dir === null ? '' : ' '.$dir; |
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return implode($dir.', ', $fields).$dir; |
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} |
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/** |
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* Retrieve the ORDER BY clause for the {@see self::MODE_CUSTOM} mode. |
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* |
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* @throws UnexpectedValueException If the custom clause is empty. |
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* @return string |
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*/ |
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protected function byCondition() |
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{ |
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if (!$this->hasCondition()) { |
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throw new UnexpectedValueException( |
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'Custom expression can not be empty.' |
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); |
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} |
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return $this->condition(); |
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} |
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/** |
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* Retrieve the ORDER BY clause for the {@see self::MODE_VALUES} mode. |
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* |
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* @throws UnexpectedValueException If any required property or values is empty. |
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* @return string |
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*/ |
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protected function byValues() |
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{ |
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$fields = $this->fieldIdentifiers(); |
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if (empty($fields)) { |
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throw new UnexpectedValueException( |
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'Property is required.' |
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); |
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} |
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$values = $this->prepareValues($this->values()); |
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if (empty($values)) { |
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throw new UnexpectedValueException( |
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'Values can not be empty.' |
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); |
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} |
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$dir = $this->direction(); |
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$dir = $dir === null ? '' : ' '.$dir; |
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$values = implode(',', $values); |
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$clauses = []; |
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foreach ($fields as $fieldName) { |
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$clauses[] = sprintf('FIELD(%1$s, %2$s)', $fieldName, $values).$dir; |
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} |
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return implode(', ', $clauses); |
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} |
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/** |
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* Parse the given values for SQL. |
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* |
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* @param mixed $values The value to be normalized. |
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* @return array Returns a collection of parsed values. |
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*/ |
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public function prepareValues($values) |
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{ |
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if (empty($values)) { |
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return []; |
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} |
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if (!is_array($values)) { |
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$values = (array)$values; |
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} |
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$values = array_filter($values, 'is_scalar'); |
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$values = array_map('self::quoteValue', $values); |
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return $values; |
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} |
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} |
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locomotivemtl /
charcoal-core
