spring OnJavaCondition 源码
springboot OnJavaCondition 代码
文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnJavaCondition.java
/*
* Copyright 2012-2019 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.autoconfigure.condition;
import java.util.Map;
import org.springframework.boot.autoconfigure.condition.ConditionalOnJava.Range;
import org.springframework.boot.system.JavaVersion;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.type.AnnotatedTypeMetadata;
/**
* {@link Condition} that checks for a required version of Java.
*
* @author Oliver Gierke
* @author Phillip Webb
* @see ConditionalOnJava
*/
@Order(Ordered.HIGHEST_PRECEDENCE + 20)
class OnJavaCondition extends SpringBootCondition {
private static final JavaVersion JVM_VERSION = JavaVersion.getJavaVersion();
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
Map<String, Object> attributes = metadata.getAnnotationAttributes(ConditionalOnJava.class.getName());
Range range = (Range) attributes.get("range");
JavaVersion version = (JavaVersion) attributes.get("value");
return getMatchOutcome(range, JVM_VERSION, version);
}
protected ConditionOutcome getMatchOutcome(Range range, JavaVersion runningVersion, JavaVersion version) {
boolean match = isWithin(runningVersion, range, version);
String expected = String.format((range != Range.EQUAL_OR_NEWER) ? "(older than %s)" : "(%s or newer)", version);
ConditionMessage message = ConditionMessage.forCondition(ConditionalOnJava.class, expected)
.foundExactly(runningVersion);
return new ConditionOutcome(match, message);
}
/**
* Determines if the {@code runningVersion} is within the specified range of versions.
* @param runningVersion the current version.
* @param range the range
* @param version the bounds of the range
* @return if this version is within the specified range
*/
private boolean isWithin(JavaVersion runningVersion, Range range, JavaVersion version) {
if (range == Range.EQUAL_OR_NEWER) {
return runningVersion.isEqualOrNewerThan(version);
}
if (range == Range.OLDER_THAN) {
return runningVersion.isOlderThan(version);
}
throw new IllegalStateException("Unknown range " + range);
}
}
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- 所属分类： 后端技术
- 本文标签： Java Spring Spring Boot
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