/
CursorExecutor.java
85 lines (72 loc) · 3.41 KB
/
CursorExecutor.java
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/*
* Copyright (c) 2024 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 jakarta.data.Sort;
import jakarta.data.page.CursoredPage;
import jakarta.data.page.PageRequest;
import jakarta.data.page.impl.CursoredPageRecord;
import org.eclipse.jnosql.communication.CommunicationException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
enum CursorExecutor {
OFF_SET {
@SuppressWarnings("unchecked")
@Override
public CursoredPage<CommunicationEntity> cursor(SelectQuery query, PageRequest<?> pageRequest, DatabaseManager template) {
var select = new DefaultSelectQuery(pageRequest.size(), 0, query.name(), query.columns(), query.sorts(),
query.condition().orElse(null));
var entities = template.select(select).toList();
var last = entities.isEmpty() ? null : entities.get(entities.size() - 1);
if (last == null) {
return new CursoredPageRecord<>(entities, Collections.emptyList(), -1, (PageRequest<CommunicationEntity>) pageRequest,
null, null);
} else {
PageRequest.Cursor cursor = getCursor(query.sorts(), last);
PageRequest<CommunicationEntity> afterCursor = PageRequest.<CommunicationEntity>ofSize(pageRequest.size()).afterCursor(cursor);
return new CursoredPageRecord<>(entities, Collections.emptyList(), -1, (PageRequest<CommunicationEntity>)
pageRequest, afterCursor, null);
}
}
private <T> PageRequest.Cursor getCursor(List<Sort<?>> sorts, CommunicationEntity entity) {
List<Object> keys = new ArrayList<>();
for (Sort<?> sort : sorts) {
String name = sort.property();
Element element = entity.find(name)
.orElseThrow(() -> new CommunicationException("The sort name does not exist in the entity: " + name));
keys.add(element.get());
}
return PageRequest.Cursor.forKey(keys.toArray());
}
}, CURSOR_NEXT {
@Override
public CursoredPage<CommunicationEntity> cursor(SelectQuery query, PageRequest<?> pageRequest, DatabaseManager template) {
return null;
}
}, CURSOR_PREVIOUS {
@Override
public CursoredPage<CommunicationEntity> cursor(SelectQuery query, PageRequest<?> pageRequest, DatabaseManager template) {
return null;
}
};
abstract CursoredPage<CommunicationEntity> cursor(SelectQuery query, PageRequest<?> pageRequest, DatabaseManager template);
public static CursorExecutor of(PageRequest.Mode value) {
return switch (value) {
case CURSOR_NEXT -> CURSOR_NEXT;
case CURSOR_PREVIOUS -> CURSOR_PREVIOUS;
default -> OFF_SET;
};
}
}