io.micronaut.data.jpa.repository.intercept.AbstractSpecificationInterceptor Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of micronaut-data-jpa Show documentation

Data Repository Support for Micronaut

There is a newer version: 4.10.5

/*
 * Copyright 2017-2021 original 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
 *
 * https://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 io.micronaut.data.jpa.repository.intercept;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.util.StringUtils;
import io.micronaut.data.jpa.repository.criteria.Specification;
import io.micronaut.data.model.Sort;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.runtime.intercept.AbstractQueryInterceptor;

import jakarta.persistence.criteria.CriteriaBuilder;
import jakarta.persistence.criteria.Expression;
import jakarta.persistence.criteria.Order;
import jakarta.persistence.criteria.Path;
import jakarta.persistence.criteria.Root;
import java.util.ArrayList;
import java.util.List;

/**
 * Abstract specification interceptor.
 *
 * @param  The declaring type
 * @param  The return type
 * @author Denis Stepanov
 * @since 3.1
 */
public abstract class AbstractSpecificationInterceptor extends AbstractQueryInterceptor {

    /**
     * Default constructor.
     *
     * @param operations The operations
     */
    protected AbstractSpecificationInterceptor(RepositoryOperations operations) {
        super(operations);
    }

    /**
     * Find {@link Specification} in context.
     * @param context The context
     * @param nullable whether specification can be null
     * @return found specification
     */
    protected Specification getSpecification(MethodInvocationContext context, boolean nullable) {
        final Object parameterValue = context.getParameterValues()[0];
        if (parameterValue instanceof Specification specification) {
            return specification;
        }
        if (parameterValue == null) {
            if (nullable) {
                // Specification is nullable parameter
                return null;
            }
            throw new IllegalArgumentException("Specification may not be null.");
        }
        throw new IllegalArgumentException("Argument must be an instance of: " + Specification.class);
    }

    protected final List getOrders(Sort sort, Root root, CriteriaBuilder cb) {
        List orders = new ArrayList<>();
        for (Sort.Order order : sort.getOrderBy()) {
            Path