/*
* Copyright 2002-2009 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.io;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* {@link ResourceLoader} implementation that interprets plain resource paths
* as relative to a given <code>java.lang.Class</code>.
*
* @author Juergen Hoeller
* @since 3.0
* @see java.lang.Class#getResource(String)
* @see ClassPathResource#ClassPathResource(String, Class)
*/
public class ClassRelativeResourceLoader extends DefaultResourceLoader {
private final Class clazz;
/**
* Create a new ClassRelativeResourceLoader for the given class.
* @param clazz the class to load resources through
*/
public ClassRelativeResourceLoader(Class clazz) {
Assert.notNull(clazz, "Class must not be null");
this.clazz = clazz;
setClassLoader(clazz.getClassLoader());
}
protected Resource getResourceByPath(String path) {
return new ClassRelativeContextResource(path, this.clazz);
}
/**
* ClassPathResource that explicitly expresses a context-relative path
* through implementing the ContextResource interface.
*/
private static class ClassRelativeContextResource extends ClassPathResource implements ContextResource {
private final Class clazz;
public ClassRelativeContextResource(String path, Class clazz) {
super(path, clazz);
this.clazz = clazz;
}
public String getPathWithinContext() {
return getPath();
}
@Override
public Resource createRelative(String relativePath) {
String pathToUse = StringUtils.applyRelativePath(getPath(), relativePath);
return new ClassRelativeContextResource(pathToUse, this.clazz);
}
}
}
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