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Diffstat (limited to 'gnu/java/net/loader/URLLoader.java')
| -rw-r--r-- | gnu/java/net/loader/URLLoader.java | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/gnu/java/net/loader/URLLoader.java b/gnu/java/net/loader/URLLoader.java new file mode 100644 index 000000000..d073c5429 --- /dev/null +++ b/gnu/java/net/loader/URLLoader.java @@ -0,0 +1,147 @@ +/* URLLoader.java -- base helper class for URLClassLoader + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.net.loader; + +import java.net.URL; +import java.net.URLClassLoader; +import java.net.URLStreamHandlerFactory; +import java.security.CodeSource; +import java.util.ArrayList; +import java.util.jar.Manifest; + +/** + * A <code>URLLoader</code> contains all logic to load resources from a + * given base <code>URL</code>. + */ +public abstract class URLLoader +{ + /** + * Our classloader to get info from if needed. + */ + final URLClassLoader classloader; + + /** + * The base URL from which all resources are loaded. + */ + final URL baseURL; + + /** + * The stream handler factory. + */ + final URLStreamHandlerFactory factory; + + /** + * The source for stream handlers. + */ + final URLStreamHandlerCache cache; + + /** + * A <code>CodeSource</code> without any associated certificates. + * It is common for classes to not have certificates associated + * with them. If they come from the same <code>URLLoader</code> + * then it is safe to share the associated <code>CodeSource</code> + * between them since <code>CodeSource</code> is immutable. + */ + final CodeSource noCertCodeSource; + + public URLLoader(URLClassLoader classloader, URLStreamHandlerCache cache, + URLStreamHandlerFactory factory, + URL baseURL) + { + this(classloader, cache, factory, baseURL, baseURL); + } + + public URLLoader(URLClassLoader classloader, URLStreamHandlerCache cache, + URLStreamHandlerFactory factory, + URL baseURL, URL overrideURL) + { + this.classloader = classloader; + this.baseURL = baseURL; + this.factory = factory; + this.cache = cache; + this.noCertCodeSource = new CodeSource(overrideURL, null); + } + + /** + * Return the base URL of this loader. + */ + public final URL getBaseURL() + { + return baseURL; + } + + /** + * Returns a <code>Class</code> loaded by this + * <code>URLLoader</code>, or <code>null</code> when this loader + * either can't load the class or doesn't know how to load classes + * at all. Most subclasses do not need to override this; it is only + * useful in situations where the subclass has a more direct way of + * making <code>Class</code> objects. + */ + public Class getClass(String className) + { + return null; + } + + /** + * Returns a <code>Resource</code> loaded by this + * <code>URLLoader</code>, or <code>null</code> when no + * <code>Resource</code> with the given name exists. + */ + public abstract Resource getResource(String s); + + /** + * Returns the <code>Manifest</code> associated with the + * <code>Resource</code>s loaded by this <code>URLLoader</code> or + * <code>null</code> there is no such <code>Manifest</code>. + */ + public Manifest getManifest() + { + return null; + } + + /** + * Return a list of new URLLoader objects representing any + * class path entries added by this container. + */ + public ArrayList getClassPath() + { + return null; + } +}
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