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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;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.data.annotation.Query;
import io.micronaut.data.intercept.FindPageInterceptor;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.runtime.PreparedQuery;
import io.micronaut.data.operations.RepositoryOperations;

import java.util.List;

/**
 * Default implementation of {@link FindPageInterceptor}.
 *
 * @param  The declaring type
 * @param  The paged type.
 * @author graemerocher
 * @since 1.0.0
 */
public class DefaultFindPageInterceptor extends AbstractQueryInterceptor implements FindPageInterceptor {

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

    @Override
    public R intercept(RepositoryMethodKey methodKey, MethodInvocationContext context) {
        Class returnType = context.getReturnType().getType();
        if (context.hasAnnotation(Query.class)) {
            PreparedQuery preparedQuery = prepareQuery(methodKey, context);
            PreparedQuery countQuery = prepareCountQuery(methodKey, context);

            Iterable iterable = operations.findAll(preparedQuery);
            List resultList = (List) CollectionUtils.iterableToList(iterable);
            Number n = operations.findOne(countQuery);
            Long result = n != null ? n.longValue() : 0;
            Page page = Page.of(resultList, getPageable(context), result);
            if (returnType.isInstance(page)) {
                return (R) page;
            } else {
                return operations.getConversionService().convert(page, returnType)
                        .orElseThrow(() -> new IllegalStateException("Unsupported page interface type " + returnType));
            }
        } else {

            Page page = operations.findPage(getPagedQuery(context));
            if (returnType.isInstance(page)) {
                return (R) page;
            } else {
                return operations.getConversionService().convert(page, returnType)
                        .orElseThrow(() -> new IllegalStateException("Unsupported page interface type " + returnType));
            }
        }
    }
}