spring EnvironmentCapable 源码
spring EnvironmentCapable 代码
文件路径：/spring-core/src/main/java/org/springframework/core/env/EnvironmentCapable.java
/*
* Copyright 2002-2017 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.core.env;
/**
* Interface indicating a component that contains and exposes an {@link Environment} reference.
*
* <p>All Spring application contexts are EnvironmentCapable, and the interface is used primarily
* for performing {@code instanceof} checks in framework methods that accept BeanFactory
* instances that may or may not actually be ApplicationContext instances in order to interact
* with the environment if indeed it is available.
*
* <p>As mentioned, {@link org.springframework.context.ApplicationContext ApplicationContext}
* extends EnvironmentCapable, and thus exposes a {@link #getEnvironment()} method; however,
* {@link org.springframework.context.ConfigurableApplicationContext ConfigurableApplicationContext}
* redefines {@link org.springframework.context.ConfigurableApplicationContext#getEnvironment
* getEnvironment()} and narrows the signature to return a {@link ConfigurableEnvironment}.
* The effect is that an Environment object is 'read-only' until it is being accessed from
* a ConfigurableApplicationContext, at which point it too may be configured.
*
* @author Chris Beams
* @since 3.1
* @see Environment
* @see ConfigurableEnvironment
* @see org.springframework.context.ConfigurableApplicationContext#getEnvironment()
*/
public interface EnvironmentCapable {
/**
* Return the {@link Environment} associated with this component.
*/
Environment getEnvironment();
}
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