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package com.sun.opengl.impl.io;
import javax.media.opengl.util.*;
import java.util.*;
import java.nio.*;
import java.io.*;
import java.net.*;
/** Utilities for dealing with streams. */
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) {
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) {
URL url = null;
if (cl != null) {
url = cl.getResource(path);
} else {
url = ClassLoader.getSystemResource(path);
}
if(!urlExists(url)) {
url = null;
try {
url = new URL(path);
} catch (MalformedURLException e) { }
}
if(!urlExists(url)) {
url = null;
try {
File file = new File(path);
if(file.exists()) {
url = file.toURL();
}
} catch (MalformedURLException e) {}
}
return url;
}
/**
* Generates a path for the 'relativeFile' relative to the 'absoluteFileLocation'
*/
public static String getRelativeOf(String absoluteFileLocation, String relativeFile) {
File file = new File(absoluteFileLocation);
file = file.getParentFile();
while (file != null && relativeFile.startsWith("../")) {
file = file.getParentFile();
relativeFile = relativeFile.substring(3);
}
if (file != null) {
String res = new File(file, relativeFile).getPath();
// Handle things on Windows
return res.replace('\\', '/');
} else {
return 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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