com.firefly.utils.io.ClassRelativeResourceLoader Maven / Gradle / Ivy
package com.firefly.utils.io;
import com.firefly.utils.Assert;
import com.firefly.utils.StringUtils;
/**
* {@link ResourceLoader} implementation that interprets plain resource paths
* as relative to a given {@code java.lang.Class}.
*
* @see 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());
}
@Override
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;
}
@Override
public String getPathWithinContext() {
return getPath();
}
@Override
public Resource createRelative(String relativePath) {
String pathToUse = StringUtils.applyRelativePath(getPath(), relativePath);
return new ClassRelativeContextResource(pathToUse, this.clazz);
}
}
}