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<?php |
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namespace BaoPham\DynamoDb\Parsers; |
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use BaoPham\DynamoDb\ComparisonOperator; |
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use BaoPham\DynamoDb\NotSupportedException; |
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use BaoPham\DynamoDb\Facades\DynamoDb; |
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use Illuminate\Support\Arr; |
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class ConditionExpression |
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{ |
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const OPERATORS = [ |
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ComparisonOperator::EQ => '%s = :%s', |
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ComparisonOperator::LE => '%s <= :%s', |
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ComparisonOperator::LT => '%s < :%s', |
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ComparisonOperator::GE => '%s >= :%s', |
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ComparisonOperator::GT => '%s > :%s', |
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ComparisonOperator::BEGINS_WITH => 'begins_with(%s, :%s)', |
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ComparisonOperator::BETWEEN => '(%s BETWEEN :%s AND :%s)', |
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ComparisonOperator::CONTAINS => 'contains(%s, :%s)', |
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ComparisonOperator::NOT_CONTAINS => 'NOT contains(%s, :%s)', |
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ComparisonOperator::NULL => 'attribute_not_exists(%s)', |
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ComparisonOperator::NOT_NULL => 'attribute_exists(%s)', |
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ComparisonOperator::NE => '%s <> :%s', |
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ComparisonOperator::IN => '%s IN (%s)', |
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]; |
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/** |
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* @var ExpressionAttributeValues |
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*/ |
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protected $values; |
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/** |
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* @var ExpressionAttributeNames |
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*/ |
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protected $names; |
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/** |
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* @var Placeholder |
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*/ |
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protected $placeholder; |
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public function __construct( |
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Placeholder $placeholder, |
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ExpressionAttributeValues $values, |
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ExpressionAttributeNames $names |
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) { |
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$this->placeholder = $placeholder; |
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$this->values = $values; |
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$this->names = $names; |
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} |
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/** |
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* @param array $where |
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* [ |
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* 'column' => 'name', |
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* 'type' => 'EQ', |
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* 'value' => 'foo', |
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* 'boolean' => 'and', |
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* ] |
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* |
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* @return string |
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* @throws NotSupportedException |
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*/ |
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public function parse($where) |
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{ |
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if (empty($where)) { |
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return ''; |
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} |
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$parsed = []; |
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foreach ($where as $condition) { |
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$boolean = Arr::get($condition, 'boolean'); |
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$value = Arr::get($condition, 'value'); |
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$type = Arr::get($condition, 'type'); |
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$prefix = ''; |
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if (count($parsed) > 0) { |
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$prefix = strtoupper($boolean) . ' '; |
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} |
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if ($type === 'Nested') { |
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$parsed[] = $prefix . $this->parseNestedCondition($value); |
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continue; |
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} |
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$parsed[] = $prefix . $this->parseCondition( |
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Arr::get($condition, 'column'), |
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$type, |
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$value |
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); |
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} |
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return implode(' ', $parsed); |
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} |
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public function reset() |
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{ |
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$this->placeholder->reset(); |
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$this->names->reset(); |
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$this->values->reset(); |
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} |
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protected function getSupportedOperators() |
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{ |
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return static::OPERATORS; |
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} |
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protected function parseNestedCondition(array $conditions) |
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{ |
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return '(' . $this->parse($conditions) . ')'; |
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} |
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protected function parseCondition($name, $operator, $value) |
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{ |
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$operators = $this->getSupportedOperators(); |
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if (empty($operators[$operator])) { |
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throw new NotSupportedException("$operator is not supported"); |
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} |
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$template = $operators[$operator]; |
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$this->names->set($name); |
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if ($operator === ComparisonOperator::BETWEEN) { |
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return $this->parseBetweenCondition($name, $value, $template); |
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} |
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if ($operator === ComparisonOperator::IN) { |
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return $this->parseInCondition($name, $value, $template); |
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} |
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if ($operator === ComparisonOperator::NULL || $operator === ComparisonOperator::NOT_NULL) { |
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return $this->parseNullCondition($name, $template); |
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} |
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$placeholder = $this->placeholder->next(); |
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$this->values->set($placeholder, DynamoDb::marshalValue($value)); |
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return sprintf($template, $this->names->placeholder($name), $placeholder); |
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} |
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protected function parseBetweenCondition($name, $value, $template) |
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{ |
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$first = $this->placeholder->next(); |
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$second = $this->placeholder->next(); |
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$this->values->set($first, DynamoDb::marshalValue($value[0])); |
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$this->values->set($second, DynamoDb::marshalValue($value[1])); |
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return sprintf($template, $this->names->placeholder($name), $first, $second); |
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} |
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protected function parseInCondition($name, $value, $template) |
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{ |
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$valuePlaceholders = []; |
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3 |
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foreach ($value as $item) { |
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$placeholder = $this->placeholder->next(); |
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$valuePlaceholders[] = ":" . $placeholder; |
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$this->values->set($placeholder, DynamoDb::marshalValue($item)); |
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} |
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return sprintf($template, $this->names->placeholder($name), implode(', ', $valuePlaceholders)); |
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} |
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protected function parseNullCondition($name, $template) |
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{ |
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return sprintf($template, $this->names->placeholder($name)); |
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} |
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} |
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baopham /
laravel-dynamodb
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