/*
* Copyright 2011-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.querydsl;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import com.querydsl.core.types.OrderSpecifier;
import com.querydsl.core.types.Predicate;
/**
* Interface to allow execution of QueryDsl {@link Predicate} instances.
*
* @author Oliver Gierke
* @author Thomas Darimont
*/
public interface QuerydslPredicateExecutor<T> {
/**
* Returns a single entity matching the given {@link Predicate} or {@literal null} if none was found.
*
* @param predicate can be {@literal null}.
* @return a single entity matching the given {@link Predicate} or {@literal null} if none was found.
* @throws org.springframework.dao.IncorrectResultSizeDataAccessException if the predicate yields more than one
* result.
*/
T findOne(Predicate predicate);
/**
* Returns all entities matching the given {@link Predicate}. In case no match could be found an empty
* {@link Iterable} is returned.
*
* @param predicate can be {@literal null}.
* @return all entities matching the given {@link Predicate}.
*/
Iterable<T> findAll(Predicate predicate);
/**
* Returns all entities matching the given {@link Predicate} applying the given {@link Sort}. In case no match could
* be found an empty {@link Iterable} is returned.
*
* @param predicate can be {@literal null}.
* @param sort the {@link Sort} specification to sort the results by, must not be {@literal null}.
* @return all entities matching the given {@link Predicate}.
* @since 1.10
*/
Iterable<T> findAll(Predicate predicate, Sort sort);
/**
* Returns all entities matching the given {@link Predicate} applying the given {@link OrderSpecifier}s. In case no
* match could be found an empty {@link Iterable} is returned.
*
* @param predicate can be {@literal null}.
* @param orders the {@link OrderSpecifier}s to sort the results by
* @return all entities matching the given {@link Predicate} applying the given {@link OrderSpecifier}s.
*/
Iterable<T> findAll(Predicate predicate, OrderSpecifier<?>... orders);
/**
* Returns all entities ordered by the given {@link OrderSpecifier}s.
*
* @param orders the {@link OrderSpecifier}s to sort the results by.
* @return all entities ordered by the given {@link OrderSpecifier}s.
*/
Iterable<T> findAll(OrderSpecifier<?>... orders);
/**
* Returns a {@link Page} of entities matching the given {@link Predicate}. In case no match could be found, an empty
* {@link Page} is returned.
*
* @param predicate can be {@literal null}.
* @param pageable must not be {@literal null}.
* @return a {@link Page} of entities matching the given {@link Predicate}.
*/
Page<T> findAll(Predicate predicate, Pageable pageable);
/**
* Returns the number of instances matching the given {@link Predicate}.
*
* @param predicate the {@link Predicate} to count instances for, can be {@literal null}.
* @return the number of instances matching the {@link Predicate}.
*/
long count(Predicate predicate);
/**
* Checks whether the data store contains elements that match the given {@link Predicate}.
*
* @param predicate the {@link Predicate} to use for the existance check, can be {@literal null}.
* @return {@literal true} if the data store contains elements that match the given {@link Predicate}.
*/
boolean exists(Predicate predicate);
}