/
AbstractColumnTemplate.java
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/
AbstractColumnTemplate.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.semistructured;
import jakarta.data.exceptions.NonUniqueResultException;
import jakarta.nosql.PreparedStatement;
import jakarta.nosql.QueryMapper;
import org.eclipse.jnosql.communication.semistructured.CommunicationEntity;
import org.eclipse.jnosql.communication.semistructured.CommunicationObserverParser;
import org.eclipse.jnosql.communication.semistructured.DatabaseManager;
import org.eclipse.jnosql.communication.semistructured.DeleteQuery;
import org.eclipse.jnosql.communication.semistructured.QueryParser;
import org.eclipse.jnosql.communication.semistructured.SelectQuery;
import org.eclipse.jnosql.mapping.core.Converters;
import org.eclipse.jnosql.mapping.IdNotFoundException;
import org.eclipse.jnosql.mapping.metadata.EntitiesMetadata;
import org.eclipse.jnosql.mapping.metadata.EntityMetadata;
import org.eclipse.jnosql.mapping.metadata.FieldMetadata;
import org.eclipse.jnosql.mapping.core.util.ConverterUtil;
import org.eclipse.jnosql.mapping.metadata.InheritanceMetadata;
import java.time.Duration;
import java.util.Iterator;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.UnaryOperator;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import static java.util.Objects.requireNonNull;
/**
* The template method to {@link SemistructuredTemplate}
*/
public abstract class AbstractColumnTemplate implements SemistructuredTemplate {
private static final QueryParser PARSER = new QueryParser();
protected abstract ColumnEntityConverter getConverter();
protected abstract DatabaseManager getManager();
protected abstract ColumnEventPersistManager getEventManager();
protected abstract EntitiesMetadata getEntities();
protected abstract Converters getConverters();
private final UnaryOperator<CommunicationEntity> insert = e -> getManager().insert(e);
private final UnaryOperator<CommunicationEntity> update = e -> getManager().update(e);
private CommunicationObserverParser observer;
private CommunicationObserverParser getObserver() {
if (Objects.isNull(observer)) {
observer = new MapperObserver(getEntities());
}
return observer;
}
@Override
public <T> T insert(T entity) {
requireNonNull(entity, "entity is required");
return persist(entity, insert);
}
@Override
public <T> T insert(T entity, Duration ttl) {
requireNonNull(entity, "entity is required");
requireNonNull(ttl, "ttl is required");
return persist(entity, e -> getManager().insert(e, ttl));
}
@Override
public <T> T update(T entity) {
requireNonNull(entity, "entity is required");
return persist(entity, update);
}
@Override
public <T> Iterable<T> update(Iterable<T> entities) {
requireNonNull(entities, "entity is required");
return StreamSupport.stream(entities.spliterator(), false)
.map(this::update).collect(Collectors.toList());
}
@Override
public <T> Iterable<T> insert(Iterable<T> entities) {
requireNonNull(entities, "entities is required");
return StreamSupport.stream(entities.spliterator(), false)
.map(this::insert).collect(Collectors.toList());
}
@Override
public <T> Iterable<T> insert(Iterable<T> entities, Duration ttl) {
requireNonNull(entities, "entities is required");
requireNonNull(ttl, "ttl is required");
return StreamSupport.stream(entities.spliterator(), false)
.map(e -> insert(e, ttl))
.collect(Collectors.toList());
}
@Override
public void delete(DeleteQuery query) {
requireNonNull(query, "query is required");
getManager().delete(query);
}
@Override
public <T> Stream<T> select(SelectQuery query) {
requireNonNull(query, "query is required");
return executeQuery(query);
}
@Override
public long count(SelectQuery query) {
return getManager().count(query);
}
@Override
public boolean exists(SelectQuery query) {
return getManager().exists(query);
}
@Override
public <T> Optional<T> singleResult(SelectQuery query) {
requireNonNull(query, "query is required");
final Stream<T> select = select(query);
final Iterator<T> iterator = select.iterator();
if (!iterator.hasNext()) {
return Optional.empty();
}
final T entity = iterator.next();
if (!iterator.hasNext()) {
return Optional.of(entity);
}
throw new NonUniqueResultException("No Unique result found to the query: " + query);
}
@Override
public <T, K> Optional<T> find(Class<T> type, K id) {
requireNonNull(type, "type is required");
requireNonNull(id, "id is required");
EntityMetadata entityMetadata = getEntities().get(type);
FieldMetadata idField = entityMetadata.id()
.orElseThrow(() -> IdNotFoundException.newInstance(type));
Object value = ConverterUtil.getValue(id, entityMetadata, idField.fieldName(), getConverters());
SelectQuery query = SelectQuery.select().from(entityMetadata.name())
.where(idField.name()).eq(value).build();
return singleResult(query);
}
@Override
public <T, K> void delete(Class<T> type, K id) {
requireNonNull(type, "type is required");
requireNonNull(id, "id is required");
EntityMetadata entityMetadata = getEntities().get(type);
FieldMetadata idField = entityMetadata.id()
.orElseThrow(() -> IdNotFoundException.newInstance(type));
Object value = ConverterUtil.getValue(id, entityMetadata, idField.fieldName(), getConverters());
DeleteQuery query = DeleteQuery.delete().from(entityMetadata.name())
.where(idField.name()).eq(value).build();
getManager().delete(query);
}
@Override
public <T> Stream<T> query(String query) {
requireNonNull(query, "query is required");
return PARSER.query(query, getManager(), getObserver()).map(c -> getConverter().toEntity(c));
}
@Override
public <T> Optional<T> singleResult(String query) {
Stream<T> entities = query(query);
final Iterator<T> iterator = entities.iterator();
if (!iterator.hasNext()) {
return Optional.empty();
}
final T entity = iterator.next();
if (!iterator.hasNext()) {
return Optional.of(entity);
}
throw new NonUniqueResultException("No unique result found to the query: " + query);
}
@Override
public PreparedStatement prepare(String query) {
return new ColumnPreparedStatement(PARSER.prepare(query, getManager(), getObserver()), getConverter());
}
@Override
public long count(String columnFamily) {
return getManager().count(columnFamily);
}
@Override
public <T> long count(Class<T> type) {
requireNonNull(type, "entity class is required");
return getManager().count(findAllQuery(type));
}
private <T> Stream<T> executeQuery(SelectQuery query) {
requireNonNull(query, "query is required");
Stream<CommunicationEntity> entities = getManager().select(query);
Function<CommunicationEntity, T> function = e -> getConverter().toEntity(e);
return entities.map(function).peek(getEventManager()::firePostEntity);
}
@Override
public <T> QueryMapper.MapperFrom select(Class<T> type) {
Objects.requireNonNull(type, "type is required");
EntityMetadata metadata = getEntities().get(type);
return new ColumnMapperSelect(metadata, getConverters(), this);
}
@Override
public <T> QueryMapper.MapperDeleteFrom delete(Class<T> type) {
Objects.requireNonNull(type, "type is required");
EntityMetadata metadata = getEntities().get(type);
return new ColumnMapperDelete(metadata, getConverters(), this);
}
@Override
public <T> Stream<T> findAll(Class<T> type) {
Objects.requireNonNull(type, "type is required");
return select(findAllQuery(type));
}
@Override
public <T> void deleteAll(Class<T> type) {
Objects.requireNonNull(type, "type is required");
EntityMetadata metadata = getEntities().get(type);
if(metadata.inheritance().isPresent()){
InheritanceMetadata inheritanceMetadata = metadata.inheritance().orElseThrow();
if(!inheritanceMetadata.parent().equals(metadata.type())){
getManager().delete(DeleteQuery.delete().from(metadata.name())
.where(inheritanceMetadata.discriminatorColumn())
.eq(inheritanceMetadata.discriminatorValue()).build());
return;
}
}
getManager().delete(DeleteQuery.delete().from(metadata.name()).build());
}
protected <T> T persist(T entity, UnaryOperator<CommunicationEntity> persistAction) {
return Stream.of(entity)
.map(toUnary(getEventManager()::firePreEntity))
.map(getConverter()::toColumn)
.map(persistAction)
.map(t -> getConverter().toEntity(entity, t))
.map(toUnary(getEventManager()::firePostEntity))
.findFirst()
.orElseThrow();
}
private <T> UnaryOperator<T> toUnary(Consumer<T> consumer) {
return t -> {
consumer.accept(t);
return t;
};
}
private <T> SelectQuery findAllQuery(Class<T> type){
EntityMetadata metadata = getEntities().get(type);
if(metadata.inheritance().isPresent()){
InheritanceMetadata inheritanceMetadata = metadata.inheritance().orElseThrow();
if(!inheritanceMetadata.parent().equals(metadata.type())){
return SelectQuery.select().from(metadata.name())
.where(inheritanceMetadata.discriminatorColumn()).eq(inheritanceMetadata.discriminatorValue()).build();
}
}
return SelectQuery.select().from(metadata.name()).build();
}
}