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DynamicReturn.java
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/
DynamicReturn.java
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/*
* Copyright (c) 2019 Otávio Santana and others
* 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.jnosql.artemis.reflection;
import org.jnosql.artemis.Pagination;
import org.jnosql.diana.api.NonUniqueResultException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import java.util.function.Supplier;
import static java.util.Objects.requireNonNull;
/**
* This instance has information to return at the dynamic query in Repository.
* To create an instance, use, {@link DynamicReturn#builder()}
*
* @param <T> the source type
*/
public final class DynamicReturn<T> implements MethodDynamicExecutable {
/**
* A wrapper function that convert a result as a list to a result as optional
*
* @param method the method source
* @return the function that does this conversion
*/
public static Function<Supplier<List<?>>, Supplier<Optional<?>>> toSingleResult(final Method method) {
return new SupplierConverter(method);
}
@Override
public Object execute() {
return DynamicReturnConverter.INSTANCE.convert(this);
}
private static class SupplierConverter implements Function<Supplier<List<?>>, Supplier<Optional<?>>> {
private final Method method;
SupplierConverter(Method method) {
this.method = method;
}
@Override
public Supplier<Optional<?>> apply(Supplier<List<?>> l) {
return () -> {
List<?> entities = l.get();
if (entities.isEmpty()) {
return Optional.empty();
}
if (entities.size() == 1) {
return Optional.ofNullable(entities.get(0));
}
throw new NonUniqueResultException("No unique result to the method: " + method);
};
}
}
private final Class<T> classSource;
private final Method methodSource;
private final Supplier<Optional<T>> singleResult;
private final Supplier<List<T>> list;
private final Pagination pagination;
private DynamicReturn(Class<T> classSource, Method methodSource,
Supplier<Optional<T>> singleResult,
Supplier<List<T>> list, Pagination pagination) {
this.classSource = classSource;
this.methodSource = methodSource;
this.singleResult = singleResult;
this.list = list;
this.pagination = pagination;
}
/**
* The repository class type source.
*
* @return The repository class type source.
*/
Class<T> typeClass() {
return classSource;
}
/**
* The method source at the Repository
*
* @return The method source at the Repository
*/
Method getMethod() {
return methodSource;
}
/**
* Returns the result as single result
*
* @return the result as single result
*/
Optional<T> singleResult() {
return singleResult.get();
}
/**
* Returns the result as {@link List}
*
* @return the result as {@link List}
*/
List<T> list() {
return list.get();
}
/**
* @return the pagination
*/
Optional<Pagination> getPagination() {
return Optional.ofNullable(pagination);
}
/**
* Creates a builder to DynamicReturn
*
* @param <T> the type
* @return a builder instance
*/
public static <T> DefaultDynamicReturnBuilder builder() {
return new DefaultDynamicReturnBuilder();
}
/**
* A builder of {@link DynamicReturn}
*/
public static final class DefaultDynamicReturnBuilder {
private Class<?> classSource;
private Method methodSource;
private Supplier<Optional<?>> singleResult;
private Supplier<List<?>> list;
private Pagination pagination;
private DefaultDynamicReturnBuilder() {
}
/**
* @param classSource set the classSource
* @return the instance
*/
public DefaultDynamicReturnBuilder withClassSource(Class<?> classSource) {
this.classSource = classSource;
return this;
}
/**
* @param methodSource the method source
* @return the builder instance
*/
public DefaultDynamicReturnBuilder withMethodSource(Method methodSource) {
this.methodSource = methodSource;
return this;
}
/**
* @param singleResult the singleResult source
* @return the builder instance
*/
public DefaultDynamicReturnBuilder withSingleResult(Supplier<Optional<?>> singleResult) {
this.singleResult = singleResult;
return this;
}
/**
* @param list the list
* @return the builder instance
*/
public DefaultDynamicReturnBuilder withList(Supplier<List<?>> list) {
this.list = list;
return this;
}
/**
* @param pagination the pagination
* @return the builder instance
*/
public DefaultDynamicReturnBuilder withPagination(Pagination pagination) {
this.pagination = pagination;
return this;
}
/**
* Creates a {@link DynamicReturn} from the parameters, all fields are required
*
* @return a new instance
* @throws NullPointerException when there is null attributes
*/
public DynamicReturn build() {
requireNonNull(classSource, "the class Source is required");
requireNonNull(methodSource, "the method Source is required");
requireNonNull(singleResult, "the single result supplier is required");
requireNonNull(list, "the list result supplier is required");
return new DynamicReturn(classSource, methodSource, singleResult, list, pagination);
}
}
}