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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.reactive;

import io.micronaut.core.annotation.NonNull;
import io.micronaut.data.exceptions.DataAccessException;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.operations.reactive.ReactiveCapableRepository;
import io.micronaut.data.operations.reactive.ReactiveRepositoryOperations;
import io.micronaut.data.runtime.intercept.AbstractQueryInterceptor;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;

/**
 * Abstract reactive repository interceptor.
 *
 * @param  The declaring type
 * @param  The return type
 * @author graemerocher
 * @since 1.0.0
 */
public abstract class AbstractReactiveInterceptor extends AbstractQueryInterceptor {

    @NonNull
    protected final ReactiveRepositoryOperations reactiveOperations;

    /**
     * Default constructor.
     *
     * @param operations The operations
     */
    protected AbstractReactiveInterceptor(@NonNull RepositoryOperations operations) {
        super(operations);
        if (operations instanceof ReactiveCapableRepository reactiveCapableRepository) {
            this.reactiveOperations = reactiveCapableRepository.reactive();
        } else {
            throw new DataAccessException("Datastore of type [" + operations.getClass() + "] does not support reactive operations");
        }
    }

    /**
     * Count the items.
     *
     * @param publisher the publisher
     * @return the size
     */
    protected Publisher count(Publisher publisher) {
        return Flux.from(publisher).map(v -> {
            if (v instanceof Number number) {
                return number.longValue();
            }
            return 1L;
        }).reduce(0L, Long::sum).map(Long::intValue);
    }
}