init
This commit is contained in:
Sebastian Molenda
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<?php
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declare(strict_types=1);
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/**
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* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
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* @link https://cakephp.org CakePHP(tm) Project
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* @since 3.0.0
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* @license https://opensource.org/licenses/mit-license.php MIT License
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*/
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namespace Cake\Database\Expression;
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use Cake\Database\Exception\DatabaseException;
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use Cake\Database\ExpressionInterface;
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use Cake\Database\Type\ExpressionTypeCasterTrait;
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use Cake\Database\ValueBinder;
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use Closure;
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/**
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* A Comparison is a type of query expression that represents an operation
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* involving a field an operator and a value. In its most common form the
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* string representation of a comparison is `field = value`
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*/
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class ComparisonExpression implements ExpressionInterface, FieldInterface
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{
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use ExpressionTypeCasterTrait;
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use FieldTrait;
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/**
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* The value to be used in the right hand side of the operation
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*
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* @var mixed
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*/
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protected mixed $_value;
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/**
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* The type to be used for casting the value to a database representation
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*
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* @var string|null
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*/
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protected ?string $_type = null;
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/**
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* The operator used for comparing field and value
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*
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* @var string
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*/
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protected string $_operator = '=';
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/**
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* Whether the value in this expression is a traversable
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*
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* @var bool
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*/
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protected bool $_isMultiple = false;
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/**
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* A cached list of ExpressionInterface objects that were
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* found in the value for this expression.
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*
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* @var array<\Cake\Database\ExpressionInterface>
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*/
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protected array $_valueExpressions = [];
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/**
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* Constructor
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*
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* @param \Cake\Database\ExpressionInterface|string $field the field name to compare to a value
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* @param mixed $value The value to be used in comparison
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* @param string|null $type the type name used to cast the value
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* @param string $operator the operator used for comparing field and value
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*/
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public function __construct(
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ExpressionInterface|string $field,
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mixed $value,
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?string $type = null,
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string $operator = '=',
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) {
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$this->_type = $type;
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$this->setField($field);
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$this->setValue($value);
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$this->_operator = $operator;
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}
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/**
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* Sets the value
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*
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* @param mixed $value The value to compare
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* @return void
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*/
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public function setValue(mixed $value): void
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{
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$value = $this->_castToExpression($value, $this->_type);
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$isMultiple = $this->_type && str_contains($this->_type, '[]');
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if ($isMultiple) {
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[$value, $this->_valueExpressions] = $this->_collectExpressions($value);
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}
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$this->_isMultiple = $isMultiple;
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$this->_value = $value;
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}
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/**
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* Returns the value used for comparison
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*
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* @return mixed
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*/
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public function getValue(): mixed
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{
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return $this->_value;
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}
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/**
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* Sets the operator to use for the comparison
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*
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* @param string $operator The operator to be used for the comparison.
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* @return void
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*/
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public function setOperator(string $operator): void
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{
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$this->_operator = $operator;
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}
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/**
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* Returns the operator used for comparison
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*
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* @return string
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*/
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public function getOperator(): string
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{
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return $this->_operator;
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}
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/**
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* @inheritDoc
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*/
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public function sql(ValueBinder $binder): string
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{
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$field = $this->_field;
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if ($field instanceof ExpressionInterface) {
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$field = $field->sql($binder);
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}
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if ($this->_value instanceof IdentifierExpression) {
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$template = '%s %s %s';
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$value = $this->_value->sql($binder);
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} elseif ($this->_value instanceof ExpressionInterface) {
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$template = '%s %s (%s)';
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$value = $this->_value->sql($binder);
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} else {
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[$template, $value] = $this->_stringExpression($binder);
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}
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assert(is_string($field));
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return sprintf($template, $field, $this->_operator, $value);
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}
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/**
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* @inheritDoc
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*/
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public function traverse(Closure $callback)
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{
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if ($this->_field instanceof ExpressionInterface) {
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$callback($this->_field);
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$this->_field->traverse($callback);
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}
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if ($this->_value instanceof ExpressionInterface) {
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$callback($this->_value);
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$this->_value->traverse($callback);
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}
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foreach ($this->_valueExpressions as $v) {
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$callback($v);
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$v->traverse($callback);
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}
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return $this;
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}
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/**
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* Create a deep clone.
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*
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* Clones the field and value if they are expression objects.
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*
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* @return void
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*/
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public function __clone()
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{
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foreach (['_value', '_field'] as $prop) {
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if ($this->{$prop} instanceof ExpressionInterface) {
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$this->{$prop} = clone $this->{$prop};
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}
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}
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}
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/**
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* Returns a template and a placeholder for the value after registering it
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* with the placeholder $binder
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*
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* @param \Cake\Database\ValueBinder $binder The value binder to use.
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* @return array First position containing the template and the second a placeholder
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*/
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protected function _stringExpression(ValueBinder $binder): array
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{
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$template = '%s ';
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if ($this->_field instanceof ExpressionInterface && !$this->_field instanceof IdentifierExpression) {
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$template = '(%s) ';
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}
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if ($this->_isMultiple) {
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$template .= '%s (%s)';
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$type = $this->_type;
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if ($type !== null) {
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$type = str_replace('[]', '', $type);
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}
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$value = $this->_flattenValue($this->_value, $binder, $type);
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// To avoid SQL errors when comparing a field to a list of empty values,
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// better just throw an exception here
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if ($value === '') {
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$field = $this->_field instanceof ExpressionInterface ? $this->_field->sql($binder) : $this->_field;
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/** @var string $field */
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throw new DatabaseException(
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"Impossible to generate condition with empty list of values for field ({$field})",
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);
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}
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} else {
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$template .= '%s %s';
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$value = $this->_bindValue($this->_value, $binder, $this->_type);
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}
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return [$template, $value];
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}
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/**
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* Registers a value in the placeholder generator and returns the generated placeholder
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*
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* @param mixed $value The value to bind
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* @param \Cake\Database\ValueBinder $binder The value binder to use
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* @param string|null $type The type of $value
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* @return string generated placeholder
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*/
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protected function _bindValue(mixed $value, ValueBinder $binder, ?string $type = null): string
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{
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$placeholder = $binder->placeholder('c');
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$binder->bind($placeholder, $value, $type);
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return $placeholder;
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}
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/**
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* Converts a traversable value into a set of placeholders generated by
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* $binder and separated by `,`
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*
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* @param iterable $value the value to flatten
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* @param \Cake\Database\ValueBinder $binder The value binder to use
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* @param string|null $type the type to cast values to
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* @return string
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*/
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protected function _flattenValue(iterable $value, ValueBinder $binder, ?string $type = null): string
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{
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$parts = [];
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if (is_array($value)) {
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foreach ($this->_valueExpressions as $k => $v) {
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$parts[$k] = $v->sql($binder);
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unset($value[$k]);
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}
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}
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if ($value) {
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$parts += $binder->generateManyNamed($value, $type);
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}
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return implode(',', $parts);
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}
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/**
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* Returns an array with the original $values in the first position
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* and all ExpressionInterface objects that could be found in the second
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* position.
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*
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* @param \Cake\Database\ExpressionInterface|iterable $values The rows to insert
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* @return array
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*/
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protected function _collectExpressions(ExpressionInterface|iterable $values): array
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{
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if ($values instanceof ExpressionInterface) {
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return [$values, []];
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}
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$expressions = [];
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$result = [];
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$isArray = is_array($values);
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if ($isArray) {
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$result = (array)$values;
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}
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foreach ($values as $k => $v) {
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if ($v instanceof ExpressionInterface) {
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$expressions[$k] = $v;
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}
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if ($isArray) {
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$result[$k] = $v;
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}
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}
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return [$result, $expressions];
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}
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}
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