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Diffstat (limited to 'libjava/java/net/URLClassLoader.java')
| -rw-r--r-- | libjava/java/net/URLClassLoader.java | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/libjava/java/net/URLClassLoader.java b/libjava/java/net/URLClassLoader.java new file mode 100644 index 0000000..df34306 --- /dev/null +++ b/libjava/java/net/URLClassLoader.java @@ -0,0 +1,221 @@ +/* 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. */ + +package java.net; + +import java.io.*; +import java.util.jar.*; +import java.util.Vector; + +public class URLClassLoader extends ClassLoader +{ + // The URLStreamHandlerFactory + URLStreamHandlerFactory factory = null; + + // `path' contains simply the URL's we're using for the searching. + private Vector path; + + // If path[n] is a zip/jar, then this holds a JarURLConnection for that thing, + // otherwise, path[n] is null. + private Vector info; + + private URLStreamHandler getHandler0 (String protocol) + { + if (factory != null) + return factory.createURLStreamHandler(protocol); + else + return null; + } + + public URLClassLoader (URL[] urls) + { + this (urls, null, null); + } + + public URLClassLoader (URL[] urls, ClassLoader parent) + { + this (urls, parent, null); + } + + public URLClassLoader (URL[] urls, ClassLoader parent, + URLStreamHandlerFactory fac) + { + super (parent); + + factory = fac; + + if (urls == null || urls.length == 0) + { + path = new Vector (1); + info = new Vector (1); + return; + } + + path = new Vector (urls.length); + info = new Vector (urls.length); + + for (int i = 0; i < urls.length; i++) + { + URL u = urls[i]; + + // If it is a jar url, then we'll search it as is. + if (! u.getProtocol ().equals ("jar")) + { + String f = u.getFile (); + + // If it ends with '/' we'll take it for a directory, + // otherwise it's a jar file. This is how JDK 1.2 defines + // it, so we will not try to be smart here. + if (f.charAt (f.length ()-1) != '/') + { + try + { + u = new URL ("jar", "", -1, (u.toExternalForm ())+"!/", + getHandler0 ("jar")); + } + catch (MalformedURLException x) + { + /* ignore */ + } + } + } + + path.insertElementAt (u, i); + + if (u.getProtocol ().equals ("jar")) + { + JarURLConnection conn = null; + try + { + conn = (JarURLConnection) u.openConnection (); + } + catch (java.io.IOException x) + { + /* ignore */ + } + info.insertElementAt (conn, i); + } + else + { + info.insertElementAt (null, i); + } + } + } + + public URL getResource (String name) + { + for (int i = 0; i < path.size(); i++) + { + URL u = (URL)path.elementAt (i); + + try { + JarURLConnection conn = (JarURLConnection) info.elementAt (i); + + if (conn != null) + { + if (conn.getJarEntry (name) != null) + return new URL(u, name, getHandler0 (u.getProtocol())); + } + else + { + URL p = new URL (u, name, getHandler0 (u.getProtocol())); + + InputStream is = p.openStream(); + if (is != null) + { + is.close(); + return p; + } + } + + // if we get an exception ... try the next path element + } catch (IOException x) { + continue; + } + } + + return null; + } + + /** IN jdk 1.2 this method is not overridden, but we gain performance + by doing so. + */ + + public InputStream getResourceAsStream (String name) + { + for (int i = 0; i < path.size(); i++) + { + URL u = (URL)path.elementAt (i); + + try { + JarURLConnection conn = (JarURLConnection) info.elementAt (i); + + if (conn != null) + { + JarFile file = conn.getJarFile (); + JarEntry ent = file.getJarEntry (name); + if (ent != null) + return file.getInputStream(ent); + } + else + { + InputStream is = new URL(u, name, getHandler0 (u.getProtocol())).openStream(); + if (is != null) + return is; + } + + // if we get an exception ... try the next path element + } catch (IOException x) { + continue; + } + } + + return null; + } + + // and finally, we can implement our class loader functionality. + protected Class findClass (String name) + throws ClassNotFoundException + { + if (name == null) + throw new ClassNotFoundException ("null"); + + try + { + InputStream is = getResourceAsStream (name.replace ('.', '/') + ".class"); + + if (is == null) + throw new ClassNotFoundException (name); + + // Here we have to rely on available() to provide the length of + // the class; which might not be exactly right in some cases... + + int len = is.available (); + byte[] data = new byte[len]; + + int left = len; + int off = 0; + while (left > 0) + { + int c = is.read (data, off, len-off); + if (c == -1 || c == 0) + throw new InternalError ("premature end of file"); + left -= c; + off += c; + } + + return defineClass (name, data, 0, len); + } + catch (java.io.IOException x) + { + throw new ClassNotFoundException(name); + } + } + +} + |