io.neba.core.placeholdervariables.PlaceholderVariableResolverRegistrar Maven / Gradle / Ivy

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Contains the entire NEBA core implementation, i.e. the framework that interprets the NEBA API annotations and provides implementations for the service and lifecycle callback interfaces provided in the NEBA API. This package must not export anything as its implementation details are entirely private.

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/**
 * Copyright 2013 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 io.neba.core.placeholdervariables;

import io.neba.api.configuration.PlaceholderVariableResolver;
import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Service;
import org.springframework.util.StringValueResolver;

import static io.neba.core.util.BundleUtil.displayNameOf;

/**
 * Detects all bean of type {@link PlaceholderVariableResolver}
 * in the {@link ConfigurableListableBeanFactory}. Registers a
 * {@link PlaceholderVariableResolverWrapper} for each detected resolver to dispatch placeholder resolution
 * in the application context to the resolver instances. This allows users to simply implement
 * the {@link PlaceholderVariableResolver} and not tie their implementation to the spring context.
 *
 * @author Olaf Otto
 */
@Service
public class PlaceholderVariableResolverRegistrar {
    private final Logger logger = LoggerFactory.getLogger(getClass());

    public void registerResolvers(BundleContext bundleContext, ConfigurableListableBeanFactory beanFactory) {
        this.logger.info("Detecting " + PlaceholderVariableResolver.class + " instances in " +  
        		displayNameOf(bundleContext.getBundle()) + "...");
        String[] valueResolvers = BeanFactoryUtils.beanNamesForTypeIncludingAncestors(beanFactory, 
        		PlaceholderVariableResolver.class);

        for (String resolverName : valueResolvers) {
            StringValueResolver embeddableResolver = new PlaceholderVariableResolverWrapper(beanFactory, resolverName);
            beanFactory.addEmbeddedValueResolver(embeddableResolver);  
        }
        this.logger.info("Detected and registered " + valueResolvers.length  + " resolver(s).");
    }
}