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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.RepositoryMethodKey;
import io.micronaut.data.model.CursoredPage;
import io.micronaut.data.model.DataType;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.model.Pageable.Cursor;
import io.micronaut.data.model.Pageable.Mode;
import io.micronaut.data.model.runtime.PreparedQuery;
import io.micronaut.data.model.runtime.RuntimePersistentEntity;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.runtime.operations.internal.sql.DefaultSqlPreparedQuery;

import java.util.List;

/**
 * An abstract base implementation of query interceptor for page interceptors
 * implementing {@link io.micronaut.data.intercept.FindPageInterceptor} or
 * {@link io.micronaut.data.intercept.FindCursoredPageInterceptor}.
 *
 * @param  The declaring type
 * @param  The paged type.
 * @author graemerocher
 * @since 4.8.0
 */
public abstract class DefaultAbstractFindPageInterceptor extends AbstractQueryInterceptor {

    /**
     * Default constructor.
     * @param datastore The operations
     */
    protected DefaultAbstractFindPageInterceptor(@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);

            Iterable iterable = operations.findAll(preparedQuery);
            List results = (List) CollectionUtils.iterableToList(iterable);
            Pageable pageable = getPageable(context);
            Long totalCount = null;
            if (pageable.requestTotal()) {
                PreparedQuery countQuery = prepareCountQuery(methodKey, context);
                Number n = operations.findOne(countQuery);
                totalCount = n != null ? n.longValue() : null;
            }

            Page page;
            if (pageable.getMode() == Mode.OFFSET) {
                page = Page.of(results, pageable, totalCount);
            } else if (preparedQuery instanceof DefaultSqlPreparedQuery sqlPreparedQuery) {
                List cursors;
                List