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// SearchPath.java -- generic search path utility
/* Copyright (C) 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
/* Author: Kresten Krab Thorup <krab@gnu.org> */
package gnu.gcj.util.path;
import java.util.*;
import java.util.zip.*;
import java.io.*;
import java.net.*;
final public class SearchPath {
final static String path_seperator
= System.getProperty ("path.separator");
final static char path_seperator_char
= path_seperator.charAt (0);
final static String file_seperator
= System.getProperty ("file.separator");
final static char file_seperator_char
= file_seperator.charAt (0);
private Vector path;
/**
* Constructs a SearchPath object, given a system path.
* The system path is expected to be seperated by the string
* defined by the <code>path.seperator</code> property.
* (<code>":"</code> on unix, <code>;</code> on Windows, etc.).
* The path may contain names of directories, or names of
* .zip or .jar files. Elements that are neither of these
* are ignored.
* @param sys_path the search path
*/
SearchPath (String sys_path)
{
StringTokenizer st = new StringTokenizer (sys_path, path_seperator);
init (st);
}
/**
* Constructs a SearchPath object, given a Vector of
* <code>String</code>, <code>File</code> or <code>URL</code>
* objects.
* The path may contain names of directories, or names of
* .zip or .jar files. Elements that are neither of these
* are ignored.
* @param p the vector of search path elements
*/
SearchPath (Vector p)
{
init (p.elements ());
}
public URL getURL (String element)
{
URL result;
Enumeration e = path.elements ();
while (e.hasMoreElements ())
{
PathEntry ent = (PathEntry) e.nextElement ();
result = ent.getURL (element);
if (result != null)
{
return result;
}
}
return null;
}
public InputStream getStream (String element)
{
InputStream result;
Enumeration e = path.elements ();
while (e.hasMoreElements ())
{
PathEntry ent = (PathEntry) e.nextElement ();
result = ent.getStream (element);
if (result != null)
{
return result;
}
}
return null;
}
public byte[] getBytes (String element)
{
byte[] result;
Enumeration e = path.elements ();
while (e.hasMoreElements ())
{
PathEntry ent = (PathEntry) e.nextElement ();
result = ent.getBytes (element);
if (result != null)
{
System.out.println ("loading " + ent
+ "(" + element + ")");
return result;
}
}
return null;
}
private void init (Enumeration st)
{
path = new Vector ();
while (st.hasMoreElements ())
{
Object e = st.nextElement ();
String elem;
File efile;
if (e instanceof URL)
{
path.addElement (new URLPathEntry ((URL) e));
continue;
}
if (e instanceof File)
{
efile = (File) e;
elem = efile.getPath ();
}
else if (e instanceof String)
{
elem = (String) e;
efile = new File (elem);
}
else
throw new IllegalArgumentException ();
// make sure it is absolute, so we won't get
// trouble if the cwd is changed...
if (! efile.isAbsolute ())
efile = new File (efile.getAbsolutePath ());
if (efile.isDirectory ())
{
try {
path.addElement(new DirectoryPathEntry (efile));
} catch (IOException x) {
/* ignore for now */
}
}
else if (efile.isFile ())
{
int ext = elem.lastIndexOf ('.');
if (ext == -1)
continue;
if (!elem.substring(ext+1).equalsIgnoreCase("zip"))
continue;
ZipPathEntry zpe = null;
try {
zpe = new ZipPathEntry (efile);
} catch (ZipException zx) {
System.err.println ("SearchPath::ZipException");
zpe = null;
} catch (MalformedURLException mx) {
System.err.println ("SearchPath::URLException");
zpe = null;
} catch (IOException iox) {
System.err.println ("SearchPath::IOException");
zpe = null;
}
if (zpe != null) path.addElement (zpe);
}
}
}
}
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