org.springframework.boot.DefaultApplicationContextFactory Maven / Gradle / Ivy
/*
* Copyright 2012-2022 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
*
* 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 org.springframework.boot;
import java.util.function.BiFunction;
import java.util.function.Supplier;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.io.support.SpringFactoriesLoader;
/**
* Default {@link ApplicationContextFactory} implementation that will create an
* appropriate context for the {@link WebApplicationType}.
*
* @author Phillip Webb
*/
class DefaultApplicationContextFactory implements ApplicationContextFactory {
@Override
public Class getEnvironmentType(WebApplicationType webApplicationType) {
return getFromSpringFactories(webApplicationType, ApplicationContextFactory::getEnvironmentType, null);
}
@Override
public ConfigurableEnvironment createEnvironment(WebApplicationType webApplicationType) {
return getFromSpringFactories(webApplicationType, ApplicationContextFactory::createEnvironment, null);
}
@Override
public ConfigurableApplicationContext create(WebApplicationType webApplicationType) {
try {
return getFromSpringFactories(webApplicationType, ApplicationContextFactory::create,
AnnotationConfigApplicationContext::new);
}
catch (Exception ex) {
throw new IllegalStateException("Unable create a default ApplicationContext instance, "
+ "you may need a custom ApplicationContextFactory", ex);
}
}
private T getFromSpringFactories(WebApplicationType webApplicationType,
BiFunction action, Supplier defaultResult) {
for (ApplicationContextFactory candidate : SpringFactoriesLoader.loadFactories(ApplicationContextFactory.class,
getClass().getClassLoader())) {
T result = action.apply(candidate, webApplicationType);
if (result != null) {
return result;
}
}
return (defaultResult != null) ? defaultResult.get() : null;
}
}