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An alternative API for filtering data with Spring MVC and Spring Data JPA. This library provides a custom HandlerMethodArgumentResolver that transforms HTTP parameters into a Specification object ready to use with Spring Data repositories.

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/**
 * Copyright 2014-2022 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 net.kaczmarzyk.spring.data.jpa.utils;

import javax.persistence.criteria.Fetch;
import javax.persistence.criteria.Join;
import javax.persistence.criteria.Root;
import java.util.function.Function;

/**
 * Ugly way to share context between different specifications -- e.g. joins (see
 * {@code JoinSpecificationResolver})
 *
 * @author Tomasz Kaczmarzyk
 */
public interface QueryContext {

    boolean existsJoin(String key, Root root);

    Join getEvaluated(String key, Root root);

    void putLazyVal(String key, Function, Join> value);

    Fetch getEvaluatedJoinFetch(String key);

    void putEvaluatedJoinFetch(String key, Fetch fetch);

}