spring ConditionalHint 源码
spring ConditionalHint 代码
文件路径：/spring-core/src/main/java/org/springframework/aot/hint/ConditionalHint.java
/*
* Copyright 2002-2022 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.aot.hint;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
/**
* Contract for {@link RuntimeHints runtime hints} that only apply
* if the described condition is met.
*
* @author Brian Clozel
* @since 6.0
*/
public interface ConditionalHint {
/**
* Return the type that should be reachable for this hint to apply, or
* {@code null} if this hint should always been applied.
* @return the reachable type, if any
*/
@Nullable
TypeReference getReachableType();
/**
* Whether the condition described for this hint is met. If it is not,
* the hint does not apply.
* <p>Instead of checking for actual reachability of a type in the
* application, the classpath is checked for the presence of this
* type as a simple heuristic.
* @param classLoader the current classloader
* @return whether the condition is met and the hint applies
*/
default boolean conditionMatches(ClassLoader classLoader) {
TypeReference reachableType = getReachableType();
if (reachableType != null) {
return ClassUtils.isPresent(reachableType.getCanonicalName(), classLoader);
}
return true;
}
}
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