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Data Repository Support for Micronaut

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/*
 * Copyright 2017-2019 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.async;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.data.annotation.Query;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.intercept.async.CountAsyncInterceptor;
import io.micronaut.data.model.runtime.PreparedQuery;

import java.util.Iterator;
import java.util.concurrent.CompletionStage;

/**
 * Default implementation of {@link CountAsyncInterceptor}.
 * @param  The declaring type
 * @author graemerocher
 * @since 1.0.0
 */
@SuppressWarnings("unused")
public class DefaultCountAsyncInterceptor extends AbstractAsyncInterceptor implements CountAsyncInterceptor {

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

    @Override
    public CompletionStage intercept(RepositoryMethodKey methodKey, MethodInvocationContext> context) {
        if (context.hasAnnotation(Query.class)) {
            PreparedQuery preparedQuery = prepareQuery(methodKey, context, Long.class);
            return asyncDatastoreOperations.findAll(preparedQuery)
                    .thenApply(longs -> {
                        long result = 0L;
                        Iterator i = longs.iterator();
                        if (i.hasNext()) {
                            result = i.next();
                        }
                        return result;
                    });
        } else {
            return asyncDatastoreOperations.count(getPagedQuery(context));
        }
    }
}