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<?php |
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/** |
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* Copyright 2021 Aleksandar Panic |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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namespace ArekX\PQL\Drivers\Pdo\MySql\Builders; |
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use ArekX\PQL\Contracts\StructuredQuery; |
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use ArekX\PQL\Drivers\Pdo\MySql\Builders\Traits\ConditionTrait; |
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use ArekX\PQL\Drivers\Pdo\MySql\Builders\Traits\ValueColumnTrait; |
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use ArekX\PQL\Drivers\Pdo\MySql\MySqlQueryBuilderState; |
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use ArekX\PQL\Sql\Statement\CaseWhen; |
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use Exception; |
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/** |
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* Represents a query builder for building a CASE statement |
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* |
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* @see CaseWhen |
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*/ |
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class CaseWhenBuilder extends QueryPartBuilder |
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{ |
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use ConditionTrait; |
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use ValueColumnTrait; |
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/** |
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* @inheritDoc |
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*/ |
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protected function getInitialParts(): array |
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{ |
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return ['CASE']; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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protected function getLastParts(): array |
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{ |
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return ['END']; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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protected function getRequiredParts(): array |
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{ |
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return ['when']; |
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} |
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/** |
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* @inheritDoc |
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*/ |
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protected function getPartBuilders(): array |
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{ |
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return [ |
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'when' => fn($name, MySqlQueryBuilderState $state) => $this->buildWhen($name, $state), |
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'else' => fn($name, MySqlQueryBuilderState $state) => $this->buildElse($name, $state), |
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]; |
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} |
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/** |
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* Build series of WHEN parts of the CASE. |
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* |
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* @param array $whenList List of [when, then] values to be built. |
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* @param MySqlQueryBuilderState $state |
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* @return string |
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* @throws Exception |
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*/ |
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protected function buildWhen(array $whenList, MySqlQueryBuilderState $state): string |
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{ |
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$result = []; |
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foreach ($whenList as $whenItem) { |
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[$when, $then] = $whenItem; |
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$result[] = 'WHEN ' . $this->buildCondition($when, $state) |
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. ' THEN ' . $this->buildValueColumn($then, $state); |
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} |
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return implode(' ', $result); |
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} |
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/** |
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* Build ELSE part of the case |
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* |
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* @param array|StructuredQuery $else Value to be built |
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* @param MySqlQueryBuilderState $state Current query builder state |
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* @return string |
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* @throws Exception |
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*/ |
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protected function buildElse(StructuredQuery|array $else, MySqlQueryBuilderState $state): string |
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{ |
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return 'ELSE ' . $this->buildValueColumn($else, $state); |
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} |
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} |
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ArekX /
PQL
