io.fluxcapacitor.javaclient.configuration.spring.ConditionalOnBean Maven / Gradle / Ivy

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Default Java client library for interfacing with Flux Capacitor.

There is a newer version: 0.1015.0

/*
 * Copyright (c) Flux Capacitor IP B.V. or its affiliates. All Rights Reserved.
 *
 * 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
 *     http://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.fluxcapacitor.javaclient.configuration.spring;

import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.ConfigurationCondition;
import org.springframework.core.annotation.Order;
import org.springframework.core.type.AnnotatedTypeMetadata;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Conditional(ConditionalOnBean.Condition.class)
public @interface ConditionalOnBean {

    Class value();

    @Order
    @SuppressWarnings({"NullableProblems", "ConstantConditions"})
    class Condition implements ConfigurationCondition {
        @Override
        public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
            Class type = (Class) metadata.getAllAnnotationAttributes(ConditionalOnBean.class.getName()).getFirst("value");
            return BeanFactoryUtils.beanNamesForTypeIncludingAncestors(context.getBeanFactory(), type).length != 0;
        }

        @Override
        public ConfigurationPhase getConfigurationPhase() {
            return ConfigurationPhase.REGISTER_BEAN;
        }
    }

}