org.hibernate.criterion.HibernateCollectors Maven / Gradle / Ivy
/*
* Copyright (C) 2015-2021 52°North Spatial Information Research GmbH
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* If the program is linked with libraries which are licensed under one of
* the following licenses, the combination of the program with the linked
* library is not considered a "derivative work" of the program:
*
* - Apache License, version 2.0
* - Apache Software License, version 1.0
* - GNU Lesser General Public License, version 3
* - Mozilla Public License, versions 1.0, 1.1 and 2.0
* - Common Development and Distribution License (CDDL), version 1.0
*
* Therefore the distribution of the program linked with libraries licensed
* under the aforementioned licenses, is permitted by the copyright holders
* if the distribution is compliant with both the GNU General Public License
* version 2 and the aforementioned licenses.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
package org.hibernate.criterion;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Supplier;
import java.util.stream.Collector;
import org.n52.janmayen.function.Functions;
import org.n52.janmayen.stream.Streams;
/**
* TODO JavaDoc
*
* @author Christian Autermann
*/
public final class HibernateCollectors {
private HibernateCollectors() {
}
public static Collector toDisjunction() {
return toJunktion(Restrictions::disjunction);
}
public static Collector toConjunction() {
return toJunktion(Restrictions::conjunction);
}
public static Collector toJunktion(Supplier supplier) {
BiConsumer accumulator = Junction::add;
BinaryOperator combiner = Functions.mergeLeft((d1, d2) -> Streams.stream(d2.conditions()).forEach(d1::add));
return Collector.of(supplier, accumulator, combiner, Collector.Characteristics.UNORDERED);
}
}