org.springframework.boot.context.config.ConfigDataLoader Maven / Gradle / Ivy
/*
* Copyright 2012-2021 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.context.config;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.springframework.boot.BootstrapContext;
import org.springframework.boot.BootstrapRegistry;
import org.springframework.boot.ConfigurableBootstrapContext;
import org.springframework.boot.logging.DeferredLogFactory;
/**
* Strategy class that can be used used to load {@link ConfigData} for a given
* {@link ConfigDataResource}. Implementations should be added as a
* {@code spring.factories} entries. The following constructor parameter types are
* supported:
*
* - {@link Log} or {@link DeferredLogFactory} - if the loader needs deferred
* logging
* - {@link ConfigurableBootstrapContext} - A bootstrap context that can be used to
* store objects that may be expensive to create, or need to be shared
* ({@link BootstrapContext} or {@link BootstrapRegistry} may also be used).
*
*
* Multiple loaders cannot claim the same resource.
*
* @param the resource type
* @author Phillip Webb
* @author Madhura Bhave
* @since 2.4.0
*/
public interface ConfigDataLoader {
/**
* Returns if the specified resource can be loaded by this instance.
* @param context the loader context
* @param resource the resource to check.
* @return if the resource is supported by this loader
*/
default boolean isLoadable(ConfigDataLoaderContext context, R resource) {
return true;
}
/**
* Load {@link ConfigData} for the given resource.
* @param context the loader context
* @param resource the resource to load
* @return the loaded config data or {@code null} if the location should be skipped
* @throws IOException on IO error
* @throws ConfigDataResourceNotFoundException if the resource cannot be found
*/
ConfigData load(ConfigDataLoaderContext context, R resource)
throws IOException, ConfigDataResourceNotFoundException;
}