spring OnPropertyListCondition 源码
springboot OnPropertyListCondition 代码
文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnPropertyListCondition.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.List;
import java.util.function.Supplier;
import org.springframework.boot.context.properties.bind.BindResult;
import org.springframework.boot.context.properties.bind.Bindable;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.core.type.AnnotatedTypeMetadata;
/**
* {@link Condition} that checks if a property whose value is a list is defined in the
* environment.
*
* @author Eneias Silva
* @author Stephane Nicoll
* @since 2.0.5
*/
public class OnPropertyListCondition extends SpringBootCondition {
private static final Bindable<List<String>> STRING_LIST = Bindable.listOf(String.class);
private final String propertyName;
private final Supplier<ConditionMessage.Builder> messageBuilder;
/**
* Create a new instance with the property to check and the message builder to use.
* @param propertyName the name of the property
* @param messageBuilder a message builder supplier that should provide a fresh
* instance on each call
*/
protected OnPropertyListCondition(String propertyName, Supplier<ConditionMessage.Builder> messageBuilder) {
this.propertyName = propertyName;
this.messageBuilder = messageBuilder;
}
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
BindResult<?> property = Binder.get(context.getEnvironment()).bind(this.propertyName, STRING_LIST);
ConditionMessage.Builder messageBuilder = this.messageBuilder.get();
if (property.isBound()) {
return ConditionOutcome.match(messageBuilder.found("property").items(this.propertyName));
}
return ConditionOutcome.noMatch(messageBuilder.didNotFind("property").items(this.propertyName));
}
}
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- 本文标签： Java Spring Spring Boot
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