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Extensions to integrate Micronaut and Spring

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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.spring.boot.condition;

import io.micronaut.context.BeanContext;
import io.micronaut.context.condition.Condition;
import io.micronaut.context.condition.ConditionContext;

/**
 * Implementation of {@link RequiresSingleCandidate}.
 *
 * @author graemerocher
 * @since 1.0
 */
public class RequiresSingleCandidateCondition implements Condition {
    @Override
    public boolean matches(ConditionContext context) {
        final Class type = context.getComponent().findAnnotation(RequiresSingleCandidate.class).flatMap(ann -> ann.getValue(Class.class)).orElse(null);
        if (type != null) {
            final BeanContext beanContext = context.getBeanContext();
            return beanContext.getBeanDefinitions(type).size() == 1;
        }
        return true;
    }
}