org.springframework.core.io.DefaultResourceLoader Maven / Gradle / Ivy
/*
* Copyright 2002-2007 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 java.net.MalformedURLException;
import java.net.URL;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Default implementation of the {@link ResourceLoader} interface.
* Used by {@link ResourceEditor}, and serves as base class for
* {@link org.springframework.context.support.AbstractApplicationContext}.
* Can also be used standalone.
*
* 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
* @since 10.03.2004
* @see FileSystemResourceLoader
* @see org.springframework.context.support.ClassPathXmlApplicationContext
*/
public class DefaultResourceLoader implements ResourceLoader {
private ClassLoader classLoader;
/**
* Create a new DefaultResourceLoader.
*
ClassLoader access will happen using the thread context class loader
* at the time of this ResourceLoader's initialization.
* @see java.lang.Thread#getContextClassLoader()
*/
public DefaultResourceLoader() {
this.classLoader = ClassUtils.getDefaultClassLoader();
}
/**
* Create a new DefaultResourceLoader.
* @param classLoader the ClassLoader to load class path resources with, or null
* for using the thread context class loader at the time of actual resource access
*/
public DefaultResourceLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Specify the ClassLoader to load class path resources with, or null
* for using the thread context class loader at the time of actual resource access.
*
The default is that ClassLoader access will happen using the thread context
* class loader at the time of this ResourceLoader's initialization.
*/
public void setClassLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Return the ClassLoader to load class path resources with,
* or null if using the thread context class loader on actual access
* (applying to the thread that constructs the ClassPathResource object).
*
Will get passed to ClassPathResource's constructor for all
* ClassPathResource objects created by this resource loader.
* @see ClassPathResource
*/
public ClassLoader getClassLoader() {
return this.classLoader;
}
public Resource getResource(String location) {
Assert.notNull(location, "Location must not be null");
if (location.startsWith(CLASSPATH_URL_PREFIX)) {
return new ClassPathResource(location.substring(CLASSPATH_URL_PREFIX.length()), getClassLoader());
}
else {
try {
// Try to parse the location as a URL...
URL url = new URL(location);
return new UrlResource(url);
}
catch (MalformedURLException ex) {
// No URL -> resolve as resource path.
return getResourceByPath(location);
}
}
}
/**
* Return a Resource handle for the resource at the given path.
*
The default implementation supports class path locations. This should
* be appropriate for standalone implementations but can be overridden,
* e.g. for implementations targeted at a Servlet container.
* @param path path to the resource
* @return Resource handle
* @see ClassPathResource
* @see org.springframework.context.support.FileSystemXmlApplicationContext#getResourceByPath
* @see org.springframework.web.context.support.XmlWebApplicationContext#getResourceByPath
*/
protected Resource getResourceByPath(String path) {
return new ClassPathResource(path, getClassLoader());
}
}