spring PropertiesConfigAdapter 源码
springboot PropertiesConfigAdapter 代码
文件路径：/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/properties/PropertiesConfigAdapter.java
/*
* 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.actuate.autoconfigure.metrics.export.properties;
import java.util.function.Function;
import java.util.function.Supplier;
import org.springframework.util.Assert;
/**
* Base class for properties to config adapters.
*
* @param <T> the properties type
* @author Phillip Webb
* @author Nikolay Rybak
* @since 2.0.0
*/
public class PropertiesConfigAdapter<T> {
private final T properties;
/**
* Create a new {@link PropertiesConfigAdapter} instance.
* @param properties the source properties
*/
public PropertiesConfigAdapter(T properties) {
Assert.notNull(properties, "Properties must not be null");
this.properties = properties;
}
/**
* Get the value from the properties or use a fallback from the {@code defaults}.
* @param getter the getter for the properties
* @param fallback the fallback method, usually super interface method reference
* @param <V> the value type
* @return the property or fallback value
*/
protected final <V> V get(Function<T, V> getter, Supplier<V> fallback) {
V value = getter.apply(this.properties);
return (value != null) ? value : fallback.get();
}
}
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