leap.lang.resource.DefaultResourceLoader Maven / Gradle / Ivy
/*
* 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 leap.lang.resource;
import java.net.MalformedURLException;
import java.net.URL;
import leap.lang.Args;
import leap.lang.Classes;
import leap.lang.net.Urls;
import leap.lang.path.Paths;
/**
* Default implementation of the {@link ResourceLoader} interface.
*
*
* Will return a {@link UrlResource} if the location value is a URL, and a {@link ClassPathResource} if it is a non-URL
* path or a "classpath:" pseudo-URL.
*
* @author Juergen Hoeller
* @see FileResourceLoader
*/
public class DefaultResourceLoader implements ResourceLoader {
private ClassLoader classLoader;
public DefaultResourceLoader() {
}
public DefaultResourceLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
public ClassLoader getClassLoader() {
return (this.classLoader != null ? this.classLoader : Classes.getClassLoader());
}
public Resource getResource(String name) {
Args.notNull(name, "name");
if (name.startsWith(Urls.CLASSPATH_ONE_URL_PREFIX)) {
return new ClassPathResource(name.substring(Urls.CLASSPATH_ONE_URL_PREFIX.length()), getClassLoader());
} else {
try {
// Try to parse the location as a URL...
URL url = new URL(name);
return new UrlResource(url);
} catch (MalformedURLException ex) {
// No URL -> resolve as resource path.
return getResourceByPath(name);
}
}
}
protected Resource getResourceByPath(String path) {
return new ClassPathContextResource(path, getClassLoader());
}
private static class ClassPathContextResource extends ClassPathResource implements ContextResource {
public ClassPathContextResource(String path, ClassLoader classLoader) {
super(path, classLoader);
}
public String getPathWithinContext() {
return getPath();
}
@Override
public Resource createRelative(String relativePath) {
String pathToUse = Paths.applyRelative(getPath(), relativePath);
return new ClassPathContextResource(pathToUse, getClassLoader());
}
}
}