/
SelectQueryConverter.java
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/
SelectQueryConverter.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.mapping.graph.query;
import jakarta.data.Sort;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.eclipse.jnosql.communication.query.SelectQuery;
import org.eclipse.jnosql.communication.query.method.SelectMethodProvider;
import org.eclipse.jnosql.communication.query.method.SelectMethodQueryProvider;
import org.eclipse.jnosql.mapping.core.NoSQLPage;
import org.eclipse.jnosql.mapping.metadata.EntityMetadata;
import org.eclipse.jnosql.mapping.core.repository.DynamicReturn;
import org.eclipse.jnosql.mapping.core.repository.RepositoryObserverParser;
import org.eclipse.jnosql.mapping.core.repository.SpecialParameters;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.stream.Stream;
import static org.apache.tinkerpop.gremlin.process.traversal.Order.asc;
import static org.apache.tinkerpop.gremlin.process.traversal.Order.desc;
final class SelectQueryConverter extends AbstractQueryConvert implements BiFunction<GraphQueryMethod, Object[], Stream<Vertex>> {
static final SelectQueryConverter INSTANCE = new SelectQueryConverter();
private SelectQueryConverter() {
}
@Override
public Stream<Vertex> apply(GraphQueryMethod graphQuery, Object[] params) {
SelectQuery query = selectQuery(graphQuery);
EntityMetadata mapping = graphQuery.mapping();
RepositoryObserverParser parser = RepositoryObserverParser.of(mapping);
GraphTraversal<Vertex, Vertex> traversal = getGraphTraversal(graphQuery, query::where, mapping);
traversal.hasLabel(mapping.name());
query.orderBy().forEach(getSort(traversal, parser));
updateDynamicParameter(params, traversal, query, parser);
return traversal.toStream();
}
private SelectQuery selectQuery(GraphQueryMethod graphQuery) {
if(graphQuery.method() != null) {
return SelectMethodProvider.INSTANCE.apply(graphQuery.method(), graphQuery.entityName());
}
SelectMethodQueryProvider supplier = new SelectMethodQueryProvider();
return supplier.apply(graphQuery.methodName(), graphQuery.entityName());
}
private static Consumer<Sort> getSort(GraphTraversal<Vertex, Vertex> traversal, RepositoryObserverParser parser) {
return o -> {
if (o.isAscending()) {
traversal.order().by(parser.field(o.property()), asc);
} else {
traversal.order().by(parser.field(o.property()), desc);
}
};
}
static void updateDynamicParameter(Object[] args, GraphTraversal<Vertex, Vertex> traversal, EntityMetadata mapping) {
updateDynamicParameter(args, traversal, null, RepositoryObserverParser.of(mapping));
}
private static void updateDynamicParameter(Object[] args, GraphTraversal<Vertex, Vertex> traversal,
SelectQuery query, RepositoryObserverParser parser) {
SpecialParameters special = DynamicReturn.findSpecialParameters(args);
if (query != null) {
if (query.skip() > 0) {
traversal.skip(query.skip());
}
if (query.limit() > 0) {
traversal.limit((int) query.limit());
}
}
if (special.isEmpty()) {
return;
}
if (special.hasOnlySort()) {
special.sorts().forEach(getSort(traversal, parser));
return;
}
special.limit().ifPresent(l -> {
if (l.startAt() > 1) {
traversal.skip(l.startAt() - 1);
}
traversal.limit(l.maxResults());
});
special.pageRequest().ifPresent(p -> {
special.sorts().forEach(getSort(traversal, parser));
traversal.skip(NoSQLPage.skip(p)).limit(p.size());
});
}
}