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SemistructuredParameterBasedQuery.java
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SemistructuredParameterBasedQuery.java
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/*
* Copyright (c) 2023 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.mapping.semistructured.query;
import jakarta.data.Sort;
import jakarta.enterprise.inject.spi.CDI;
import org.eclipse.jnosql.communication.semistructured.CriteriaCondition;
import org.eclipse.jnosql.mapping.semistructured.MappingQuery;
import org.eclipse.jnosql.mapping.core.Converters;
import org.eclipse.jnosql.mapping.metadata.EntityMetadata;
import org.eclipse.jnosql.mapping.metadata.FieldMetadata;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.IntFunction;
import static org.eclipse.jnosql.mapping.core.util.ConverterUtil.getValue;
/**
* The ColumnParameterBasedQuery class is responsible for generating Column queries based on a set of parameters.
* It leverages the provided parameters, PageRequest information, and entity metadata to construct a ColumnQuery object
* tailored for querying a specific entity'sort columns.
*/
public enum SemistructuredParameterBasedQuery {
INSTANCE;
private static final IntFunction<CriteriaCondition[]> TO_ARRAY = CriteriaCondition[]::new;
/**
* Constructs a ColumnQuery based on the provided parameters, PageRequest information, and entity metadata.
*
* @param params The map of parameters used for filtering columns.
* @param entityMetadata Metadata describing the structure of the entity.
* @return A ColumnQuery instance tailored for the specified entity.
*/
public org.eclipse.jnosql.communication.semistructured.SelectQuery toQuery(Map<String, Object> params,
List<Sort<?>> sorts,
EntityMetadata entityMetadata) {
var convert = CDI.current().select(Converters.class).get();
List<CriteriaCondition> conditions = new ArrayList<>();
for (Map.Entry<String, Object> entry : params.entrySet()) {
conditions.add(condition(convert, entityMetadata, entry));
}
List<Sort<?>> updateSorter = new ArrayList<>();
for (Sort<?> sort : sorts) {
var name = entityMetadata.fieldMapping(sort.property())
.map(FieldMetadata::name)
.orElse(sort.property());
updateSorter.add(sort.isAscending()? Sort.asc(name): Sort.desc(name));
}
var condition = condition(conditions);
var entity = entityMetadata.name();
return new MappingQuery(updateSorter, 0L, 0L, condition, entity);
}
private CriteriaCondition condition(List<CriteriaCondition> conditions) {
if (conditions.isEmpty()) {
return null;
} else if (conditions.size() == 1) {
return conditions.get(0);
}
return CriteriaCondition.and(conditions.toArray(TO_ARRAY));
}
private CriteriaCondition condition(Converters convert, EntityMetadata entityMetadata, Map.Entry<String, Object> entry) {
var name = entityMetadata.fieldMapping(entry.getKey())
.map(FieldMetadata::name)
.orElse(entry.getKey());
var value = getValue(entry.getValue(), entityMetadata, entry.getKey(), convert);
return CriteriaCondition.eq(name, value);
}
}