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/*
*
*/
package testapp;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.logging.*;
/**@author McDowell*/
public class Locate {
/**
* Returns the URL of a given class.
* @param c a non-null class
* @return the URL for that class
*/
public static URL getUrlOfClass(Class c) {
if(c==null) {
throw new NullPointerException();
}
String className = c.getName();
String resourceName = className.replace('.', '/') + ".class";
ClassLoader classLoader = c.getClassLoader();
if(classLoader==null) {
classLoader = ClassLoader.getSystemClassLoader();
}
URL url = classLoader.getResource(resourceName);
return url;
}
/**
* Finds the location of a given class file on the file system.
* Throws an IOException if the class cannot be found.
* <br>
* If the class is in an archive (JAR, ZIP), then the returned object
* will point to the archive file.
* <br>
* If the class is in a directory, the base directory will be returned
* with the package directory removed.
* <br>
* The <code>File.isDirectory()</code> method can be used to
* determine which is the case.
* <br>
* @param c a given class
* @return a File object
* @throws IOException
*/
public static File getClassLocation(Class c) throws IOException, FileNotFoundException {
if(c==null) {
throw new NullPointerException();
}
String className = c.getName();
String resourceName = className.replace('.', '/') + ".class";
ClassLoader classLoader = c.getClassLoader();
if(classLoader==null) {
classLoader = ClassLoader.getSystemClassLoader();
}
URL url = classLoader.getResource(resourceName);
String szUrl = url.toString();
if(szUrl.startsWith("jar:file:")) {
try {
szUrl = szUrl.substring("jar:".length(), szUrl.lastIndexOf("!"));
URI uri = new URI(szUrl);
return new File(uri);
} catch(URISyntaxException e) {
throw new IOException(e.toString());
}
} else if(szUrl.startsWith("file:")) {
try {
szUrl = szUrl.substring(0, szUrl.length() - resourceName.length());
URI uri = new URI(szUrl);
return new File(uri);
} catch(URISyntaxException e) {
throw new IOException(e.toString());
}
}
throw new FileNotFoundException(szUrl);
}
}
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