https://github.com/spring-projects/spring-framework: Spring Web MVC (Spring IO)
  • Juergen Hoeller 
/*
 * Copyright 2002-2018 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.web.servlet.resource;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.springframework.core.io.Resource;


A contract for invoking a chain of ResourceTransformers where each resolver is given a reference to the chain allowing it to delegate when necessary. 
Author:Rossen Stoyanchev
Since:4.1
/**
 * A contract for invoking a chain of {@link ResourceTransformer ResourceTransformers} where each resolver
 * is given a reference to the chain allowing it to delegate when necessary.
 *
 * @author Rossen Stoyanchev
 * @since 4.1
 */
public interface ResourceTransformerChain {

	
Return the ResourceResolverChain that was used to resolve the Resource being transformed. This may be needed for resolving related resources, e.g. links to other resources. 
/**
	 * Return the {@code ResourceResolverChain} that was used to resolve the
	 * {@code Resource} being transformed. This may be needed for resolving
	 * related resources, e.g. links to other resources.
	 */
	ResourceResolverChain getResolverChain();

	
Transform the given resource.

Params:
  • request – the current request
  • resource – the candidate resource to transform
Throws:
Returns:the transformed or the same resource, never null
/**
	 * Transform the given resource.
	 * @param request the current request
	 * @param resource the candidate resource to transform
	 * @return the transformed or the same resource, never {@code null}
	 * @throws IOException if transformation fails
	 */
	Resource transform(HttpServletRequest request, Resource resource) throws IOException;

}