/*
* Copyright 2008 biaoping.yin
*
* 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.frameworkset.spi.support;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import org.frameworkset.spi.assemble.ServiceProviderManager;
import org.frameworkset.util.Assert;
import org.frameworkset.util.io.ClassPathResource;
import org.frameworkset.util.io.ContextResource;
import org.frameworkset.util.io.Resource;
import org.frameworkset.util.io.ResourceLoader;
import org.frameworkset.util.io.UrlResource;
import com.frameworkset.util.SimpleStringUtil;
/**
* <p>Title: DefaultResourceLoader.java</p>
* <p>Description: </p>
* <p>bboss workgroup</p>
* <p>Copyright (c) 2007</p>
* @Date 2010-9-24 下午05:29:08
* @author biaoping.yin
* @version 1.0
*/
public class HotResourceLoader implements ResourceLoader {
private ClassLoader classLoader;
/**
* Create a new DefaultResourceLoader.
* <p>ClassLoader access will happen using the thread context class loader
* at the time of this ResourceLoader's initialization.
* @see java.lang.Thread#getContextClassLoader()
*/
public HotResourceLoader() {
this.classLoader = HotResourceLoader.class.getClassLoader();
}
/**
* Create a new DefaultResourceLoader.
* @param classLoader the ClassLoader to load class path resources with, or <code>null</code>
* for using the thread context class loader at the time of actual resource access
*/
public HotResourceLoader(ClassLoader classLoader) {
this.classLoader = classLoader;
}
/**
* Specify the ClassLoader to load class path resources with, or <code>null</code>
* for using the thread context class loader at the time of actual resource access.
* <p>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 <code>null</code> if using the thread context class loader on actual access
* (applying to the thread that constructs the ClassPathResource object).
* <p>Will get passed to ClassPathResource's constructor for all
* ClassPathResource objects created by this resource loader.
* @see ClassPathResource
*/
public ClassLoader getClassLoader() {
return this.classLoader;
}
private static ClassLoader getTCL() throws IllegalAccessException, InvocationTargetException {
Method method = null;
try {
method = (java.lang.Thread.class).getMethod("getContextClassLoader", null);
} catch (NoSuchMethodException e) {
return null;
}
return (ClassLoader)method.invoke(Thread.currentThread(), null);
}
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);
String url = null;
URL confURL = ServiceProviderManager.class.getClassLoader().getResource(location);
if (confURL == null)
confURL = ServiceProviderManager.class.getClassLoader().getResource("/" + location);
if (confURL == null)
confURL = getTCL().getResource(location);
if (confURL == null)
confURL = getTCL().getResource("/" + location);
if (confURL == null)
confURL = ClassLoader.getSystemResource(location);
if (confURL == null)
confURL = ClassLoader.getSystemResource("/" + location);
// if (confURL == null) {
// url = System.getProperty("user.dir");
// url += "/" + location;
// } else {
// url = confURL.toString();
// }
return new UrlResource(confURL);
}
catch (Exception ex) {
// No URL -> resolve as resource path.
return getResourceByPath(location);
}
}
}
/**
* Return a Resource handle for the resource at the given path.
* <p>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 the path to the resource
* @return the corresponding Resource handle
* @see ClassPathResource
*/
protected Resource getResourceByPath(String path) {
return new ClassPathContextResource(path, getClassLoader());
}
/**
* ClassPathResource that explicitly expresses a context-relative path
* through implementing the ContextResource interface.
*/
private static class ClassPathContextResource extends ClassPathResource implements ContextResource {
public ClassPathContextResource(String path, ClassLoader classLoader) {
super(path, classLoader);
}
public String getPathWithinContext() {
return getPath();
}
public Resource createRelative(String relativePath) {
String pathToUse = SimpleStringUtil.applyRelativePath(getPath(), relativePath);
return new ClassPathContextResource(pathToUse, getClassLoader());
}
}
}