OnMissingAmazonClientCondition.java

/*
 * Copyright 2013-2014 the original author or 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
 *
 *      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 org.springframework.cloud.aws.context.annotation;

import org.springframework.cloud.aws.core.config.AmazonWebserviceClientConfigurationUtils;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.MultiValueMap;

/**
 * @author Alain Sahli
 * @since 1.0
 */
public class OnMissingAmazonClientCondition implements Condition {

    @Override
    public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
        MultiValueMap<String, Object> attributes = metadata.getAllAnnotationAttributes(ConditionalOnMissingAmazonClient.class.getName(), true);

        for (Object amazonClientClass : attributes.get("value")) {
            if (isAmazonClientMissing(context, (String) amazonClientClass)) {
                return true;
            }
        }

        return false;
    }

    private boolean isAmazonClientMissing(ConditionContext context, String amazonClientClass) {
        String amazonClientBeanName = AmazonWebserviceClientConfigurationUtils.getBeanName(amazonClientClass);
        return !context.getBeanFactory().containsBean(amazonClientBeanName) && !context.getRegistry().containsBeanDefinition(amazonClientBeanName);
    }

}