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/*
* Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
*/
package com.jogamp.opengl.util;
import java.io.*;
import java.net.*;
/** Utilities for dealing with resources. */
public class Locator {
private Locator() {}
/**
* Locates the resource using 'getResource(String path, ClassLoader cl)',
* with this context ClassLoader and the path as is,
* as well with the context's package name path plus the path.
*
* @see #getResource(String, ClassLoader)
*/
public static URL getResource(Class context, String path) {
if(null == path) {
return null;
}
ClassLoader contextCL = (null!=context)?context.getClassLoader():null;
URL url = getResource(path, contextCL);
if (url == null && null!=context) {
// Try again by scoping the path within the class's package
String className = context.getName().replace('.', '/');
int lastSlash = className.lastIndexOf('/');
if (lastSlash >= 0) {
String tmpPath = className.substring(0, lastSlash + 1) + path;
url = getResource(tmpPath, contextCL);
}
}
return url;
}
/**
* Locates the resource using the ClassLoader's facility,
* the absolute URL and absolute file.
*
* @see ClassLoader#getResource(String)
* @see ClassLoader#getSystemResource(String)
* @see URL#URL(String)
* @see File#File(String)
*/
public static URL getResource(String path, ClassLoader cl) {
if(null == path) {
return null;
}
URL url = null;
if (cl != null) {
url = cl.getResource(path);
if(!urlExists(url)) {
url = null;
}
}
if(null == url) {
url = ClassLoader.getSystemResource(path);
if(!urlExists(url)) {
url = null;
}
}
if(null == url) {
try {
url = new URL(path);
if(!urlExists(url)) {
url = null;
}
} catch (MalformedURLException e) { }
}
if(null == url) {
try {
File file = new File(path);
if(file.exists()) {
url = file.toURL();
} else {
}
} catch (MalformedURLException e) {}
}
return url;
}
/**
* Generates a path for the 'relativeFile' relative to the 'baseLocation'.
*
* @param baseLocation denotes a directory
* @param relativeFile denotes a relative file to the baseLocation
*/
public static String getRelativeOf(File baseLocation, String relativeFile) {
if(null == relativeFile) {
return null;
}
while (baseLocation != null && relativeFile.startsWith("../")) {
baseLocation = baseLocation.getParentFile();
relativeFile = relativeFile.substring(3);
}
if (baseLocation != null) {
final File file = new File(baseLocation, relativeFile);
// Handle things on Windows
return file.getPath().replace('\\', '/');
}
return null;
}
/**
* Generates a path for the 'relativeFile' relative to the 'baseLocation'.
*
* @param baseLocation denotes a URL to a file
* @param relativeFile denotes a relative file to the baseLocation's parent directory
*/
public static String getRelativeOf(URL baseLocation, String relativeFile) {
String urlPath = baseLocation.getPath();
if ( baseLocation.toString().startsWith("jar") ) {
JarURLConnection jarConnection;
try {
jarConnection = (JarURLConnection) baseLocation.openConnection();
urlPath = jarConnection.getEntryName();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
// Try relative path first
return getRelativeOf(new File(urlPath).getParentFile(), relativeFile);
}
/**
* Returns true, if the url exists,
* trying to open a connection.
*/
public static boolean urlExists(URL url) {
boolean v = false;
if(null!=url) {
try {
URLConnection uc = url.openConnection();
v = true;
} catch (IOException ioe) { }
}
return v;
}
}
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