[not part of build] Forked for MRJPluginCarbon, to provide class loader caching, and preloading of LiveConnectProxy.

plugin/oji/MRJCarbon/plugin/Source/ProxyClassLoaderFactory.java

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+/* ----- BEGIN LICENSE BLOCK -----
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the MRJ Carbon OJI Plugin.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corp.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Patrick C. Beard <beard@netscape.com>
+ *   Xiaobin Lu <Xiaobin.Lu@eng.Sun.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ----- END LICENSE BLOCK ----- */
+
+package netscape.oji;
+
+import java.net.URLClassLoader;
+import java.net.URL;
+import java.net.MalformedURLException;
+
+import java.io.*;
+import java.util.zip.*;
+import java.util.WeakHashMap;
+
+import java.security.CodeSource;
+
+public abstract class ProxyClassLoaderFactory {
+    static void debug(String message) {
+        System.out.println("<<< " + message + " >>>");
+    }
+
+    /**
+     * Loads specified class file as an array of bytes from ${netscape.oji.plugin.home}/MRJPlugin.jar.
+     */
+    private static byte[] getMRJPluginClassFile(String path) {
+        try {
+    		String homeDir = System.getProperty("netscape.oji.plugin.home");
+    		ZipFile jarFile = new ZipFile(new File(homeDir, "MRJPlugin.jar"));
+    		ZipEntry classEntry = jarFile.getEntry(path);
+    		int size = (int) classEntry.getSize();
+    		if (size > 0) {
+    			byte[] data = new byte[size];
+    			DataInputStream input = new DataInputStream(jarFile.getInputStream(classEntry));
+    			input.readFully(data);
+    			input.close();
+    			jarFile.close();
+    			return data;
+    		}
+        } catch (IOException ioe) {
+        }
+		return null;
+    }
+    
+    /**
+     * Trivial subclass of URLClassLoader that predefines the class netscape.oji.LiveConnectProxy
+     * as if it were loaded from the specified codebase URL passed to the constructor.
+     * @see        netscape.oji.LiveConnectProxy
+     */
+    private static class ProxyClassLoader extends URLClassLoader {
+        private static byte[] data = getMRJPluginClassFile("netscape/oji/LiveConnectProxy.class");
+        ProxyClassLoader(URL[] documentURLs) {
+            super(documentURLs);
+            if (data != null) {
+                Class proxyClass = defineClass("netscape.oji.LiveConnectProxy",
+                                               data, 0, data.length,
+                                               new CodeSource(documentURLs[0], null));
+                debug("ProxyClassLoader: defined LiveConnectProxy class.");
+                debug("Here're the permisssions you've got:");
+                debug(proxyClass.getProtectionDomain().getPermissions().toString());
+            } else {
+                debug("ProxyClassLoader: failed to define LiveConnectProxy class.");
+            }
+        }
+    }
+    
+    // XXX  Should this be a weak table of some sort?
+    private static WeakHashMap mClassLoaders = new WeakHashMap();
+
+    public static ClassLoader createClassLoader(final String documentURL) throws MalformedURLException {
+        ClassLoader loader = (ClassLoader) mClassLoaders.get(documentURL);
+        if (loader == null) {
+            try {
+                URL[] documentURLs = new URL[] { new URL(documentURL) };
+                loader = new ProxyClassLoader(documentURLs);
+                mClassLoaders.put(documentURL, loader);
+    		} catch (MalformedURLException e) {
+            }
+        }
+        return loader;
+    }
+    
+    public static void destroyClassLoader(final String documentURL) {
+        mClassLoaders.remove(documentURL);
+    }
+}