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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\QueryBuilder; |
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use ArekX\PQL\Contracts\QueryBuilderState; |
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use ArekX\PQL\Contracts\RawQuery; |
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use ArekX\PQL\Contracts\StructuredQuery; |
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use ArekX\PQL\Drivers\Pdo\MySql\MySqlQueryBuilderState; |
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use ArekX\PQL\RawQueryResult; |
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/** |
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* Represents a base builder for query parts. |
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*/ |
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abstract class QueryPartBuilder implements QueryBuilder |
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{ |
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/** |
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* @inheritDoc |
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*/ |
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public function build(StructuredQuery $query, QueryBuilderState $state = null): RawQuery |
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{ |
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/** @var MySqlQueryBuilderState $state */ |
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if ($state === null) { |
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throw new \Exception('Passed state cannot be null.'); |
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} |
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$input = $query->toArray(); |
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return RawQueryResult::create( |
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$this->joinParts($state->getQueryPartGlue(), $this->buildQueryParts($input, $state)), |
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$state->getParamsBuilder()->build(), |
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$query->get('config') ?? null |
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); |
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} |
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/** |
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* Join built parts into one complete string. |
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* |
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* Part can be a string, in which case it will be joined with other by |
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* using a string in $stringGlue |
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* |
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* If a part is an array it is used as a tuple [glue, partString] and |
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* it will use its own glue string to join. |
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* |
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* @param string $stringGlue Default string glue to use if part is string |
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* @param array $builtParts List of parts to join. |
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* |
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* @return string |
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*/ |
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protected function joinParts($stringGlue, array $builtParts): string |
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{ |
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$result = ''; |
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foreach ($builtParts as $index => $part) { |
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if (is_string($part)) { |
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$result .= $index > 0 ? $stringGlue . $part : $part; |
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continue; |
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} |
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[$partGlue, $partString] = $part; |
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$result .= $partGlue . $partString; |
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} |
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return $result; |
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} |
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/** |
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* Build each part from the structured query |
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* |
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* @param array $parts Parts from the structured query |
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* @param MySqlQueryBuilderState $state Builder state |
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* @return array Resulting array for each built part. |
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* @throws \Exception |
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*/ |
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protected function buildQueryParts(array $parts, MySqlQueryBuilderState $state): array |
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{ |
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$results = $this->getInitialParts(); |
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$requiredParts = $this->getRequiredParts(); |
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foreach ($this->getPartBuilders() as $partName => $buildPart) { |
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if (empty($parts[$partName])) { |
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if (in_array($partName, $requiredParts)) { |
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throw new \Exception("Part '${partName}' is required."); |
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} |
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continue; |
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} |
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$result = $buildPart($parts[$partName], $state); |
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if ($result !== null) { |
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$results[] = $result; |
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} |
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} |
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foreach ($this->getLastParts() as $part) { |
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$results[] = $part; |
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} |
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return $results; |
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} |
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/** |
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* Return initial parts for the query |
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* |
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* @return array |
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*/ |
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protected abstract function getInitialParts(): array; |
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/** |
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* Return parts which must be set in the query in order to be built. |
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* @return array |
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*/ |
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protected abstract function getRequiredParts(): array; |
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/** |
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* Return part builders for resolving the query parts to string. |
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* |
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* @return array |
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*/ |
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protected abstract function getPartBuilders(): array; |
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/** |
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* Return last parts to be applied at the end of the query. |
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* |
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* @return array |
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*/ |
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protected abstract function getLastParts(): array; |
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} |
ArekX /
PQL
