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Data Repository Support for Micronaut

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/*
 * Copyright 2017-2020 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.runtime.intercept.criteria;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.operations.RepositoryOperations;

import java.util.List;

/**
 * Runtime implementation of {@code Page find(Specification, Pageable)}.
 *
 * @author Denis Stepanov
 * @since 3.2
 */
@Internal
public class FindPageSpecificationInterceptor extends AbstractSpecificationInterceptor {

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

    @Override
    public Object intercept(RepositoryMethodKey methodKey, MethodInvocationContext context) {
        if (context.getParameterValues().length != 2) {
            throw new IllegalStateException("Expected exactly 2 arguments to method");
        }

        Pageable pageable = getPageable(context);
        if (pageable.isUnpaged()) {
            Iterable iterable = findAll(methodKey, context, Type.FIND_PAGE);
            List