org.springframework.core.env.EnvironmentCapable Maven / Gradle / Ivy

/*
 * Copyright 2002-2012 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
 *
 *      http://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 contains and makes available an {@link Environment} object.
 *
 * 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.
 *
 * 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 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 Environment for this object
	 */
	Environment getEnvironment();

}