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DeleteQueryParser.java
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DeleteQueryParser.java
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/*
*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
*
* You may elect to redistribute this code under either of these licenses.
*
* Contributors:
*
* Otavio Santana
*
*/
package org.eclipse.jnosql.communication.semistructured;
import org.eclipse.jnosql.communication.Params;
import org.eclipse.jnosql.communication.QueryException;
import org.eclipse.jnosql.communication.query.DeleteQueryConverter;
import java.util.List;
import java.util.function.BiFunction;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Objects.requireNonNull;
public final class DeleteQueryParser implements BiFunction<org.eclipse.jnosql.communication.query.DeleteQuery, CommunicationObserverParser, DeleteQueryParams> {
Stream<CommunicationEntity> query(String query, DatabaseManager manager, CommunicationObserverParser observer) {
DeleteQuery deleteQuery = getQuery(query, observer);
manager.delete(deleteQuery);
return Stream.empty();
}
CommunicationPreparedStatement prepare(String query, DatabaseManager manager,
CommunicationObserverParser observer) {
Params params = Params.newParams();
DeleteQuery deleteQuery = getQuery(query, params, observer);
return CommunicationPreparedStatement.delete(deleteQuery, params, query, manager);
}
@Override
public DeleteQueryParams apply(org.eclipse.jnosql.communication.query.DeleteQuery deleteQuery,
CommunicationObserverParser communicationObserverParser) {
requireNonNull(deleteQuery, "deleteQuery is required");
requireNonNull(communicationObserverParser, "columnObserverParser is required");
Params params = Params.newParams();
DeleteQuery query = getQuery(params, communicationObserverParser, deleteQuery);
return new DeleteQueryParams(query, params);
}
private DeleteQuery getQuery(String query, Params params, CommunicationObserverParser observer) {
DeleteQueryConverter converter = new DeleteQueryConverter();
org.eclipse.jnosql.communication.query.DeleteQuery deleteQuery = converter.apply(query);
return getQuery(params, observer, deleteQuery);
}
private DeleteQuery getQuery(Params params, CommunicationObserverParser observer, org.eclipse.jnosql.communication.query.DeleteQuery deleteQuery) {
String columnFamily = observer.fireEntity(deleteQuery.entity());
List<String> columns = deleteQuery.fields().stream()
.map(f -> observer.fireField(columnFamily, f))
.collect(Collectors.toList());
CriteriaCondition condition = deleteQuery.where().map(c -> Conditions.getCondition(c, params, observer, columnFamily))
.orElse(null);
return new DefaultDeleteQuery(columnFamily, condition, columns);
}
private DeleteQuery getQuery(String query, CommunicationObserverParser observer) {
DeleteQueryConverter converter = new DeleteQueryConverter();
org.eclipse.jnosql.communication.query.DeleteQuery deleteQuery = converter.apply(query);
String columnFamily = observer.fireEntity(deleteQuery.entity());
List<String> columns = deleteQuery.fields().stream()
.map(f -> observer.fireField(columnFamily, f))
.collect(Collectors.toList());
Params params = Params.newParams();
CriteriaCondition condition = deleteQuery.where()
.map(c -> Conditions.getCondition(c, params, observer, columnFamily)).orElse(null);
if (params.isNotEmpty()) {
throw new QueryException("To run a query with a parameter use a PrepareStatement instead.");
}
return new DefaultDeleteQuery(columnFamily, condition, columns);
}
}