org.springframework.boot.autoconfigure.web.OnEnabledResourceChainCondition Maven / Gradle / Ivy
/*
* Copyright 2012-2016 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.boot.autoconfigure.web;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.boot.bind.PropertySourcesPropertyValues;
import org.springframework.boot.bind.RelaxedDataBinder;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.type.AnnotatedTypeMetadata;
import org.springframework.util.ClassUtils;
/**
* {@link Condition} that checks whether or not the Spring resource handling chain is
* enabled.
*
* @author Stephane Nicoll
*/
class OnEnabledResourceChainCondition extends SpringBootCondition {
private static final String WEBJAR_ASSERT_LOCATOR = "org.webjars.WebJarAssetLocator";
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context,
AnnotatedTypeMetadata metadata) {
ConfigurableEnvironment environment = (ConfigurableEnvironment) context
.getEnvironment();
ResourceProperties properties = new ResourceProperties();
RelaxedDataBinder binder = new RelaxedDataBinder(properties, "spring.resources");
binder.bind(new PropertySourcesPropertyValues(environment.getPropertySources()));
Boolean match = properties.getChain().getEnabled();
if (match == null) {
boolean webJarsLocatorPresent = ClassUtils.isPresent(WEBJAR_ASSERT_LOCATOR,
getClass().getClassLoader());
return new ConditionOutcome(webJarsLocatorPresent,
"Webjars locator (" + WEBJAR_ASSERT_LOCATOR + ") is "
+ (webJarsLocatorPresent ? "present" : "absent"));
}
return new ConditionOutcome(match,
"Resource chain is " + (match ? "enabled" : "disabled"));
}
}