1.1 --- a/src/share/classes/com/sun/tools/javac/file/CloseableURLClassLoader.java Thu Dec 10 20:35:31 2009 -0800
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,107 +0,0 @@
1.4 -/*
1.5 - * Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
1.6 - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 - *
1.8 - * This code is free software; you can redistribute it and/or modify it
1.9 - * under the terms of the GNU General Public License version 2 only, as
1.10 - * published by the Free Software Foundation. Sun designates this
1.11 - * particular file as subject to the "Classpath" exception as provided
1.12 - * by Sun in the LICENSE file that accompanied this code.
1.13 - *
1.14 - * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 - * version 2 for more details (a copy is included in the LICENSE file that
1.18 - * accompanied this code).
1.19 - *
1.20 - * You should have received a copy of the GNU General Public License version
1.21 - * 2 along with this work; if not, write to the Free Software Foundation,
1.22 - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 - *
1.24 - * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.25 - * CA 95054 USA or visit www.sun.com if you need additional information or
1.26 - * have any questions.
1.27 - */
1.28 -
1.29 -package com.sun.tools.javac.file;
1.30 -
1.31 -import java.io.Closeable;
1.32 -import java.io.IOException;
1.33 -import java.lang.reflect.Field;
1.34 -import java.net.URL;
1.35 -import java.net.URLClassLoader;
1.36 -import java.util.ArrayList;
1.37 -import java.util.jar.JarFile;
1.38 -
1.39 -/**
1.40 - * A URLClassLoader that also implements Closeable.
1.41 - * Reflection is used to access internal data structures in the URLClassLoader,
1.42 - * since no public API exists for this purpose. Therefore this code is somewhat
1.43 - * fragile. Caveat emptor.
1.44 - * @throws Error if the internal data structures are not as expected.
1.45 - *
1.46 - * <p><b>This is NOT part of any API supported by Sun Microsystems. If
1.47 - * you write code that depends on this, you do so at your own risk.
1.48 - * This code and its internal interfaces are subject to change or
1.49 - * deletion without notice.</b>
1.50 - */
1.51 -class CloseableURLClassLoader
1.52 - extends URLClassLoader implements Closeable {
1.53 - CloseableURLClassLoader(URL[] urls, ClassLoader parent) throws Error {
1.54 - super(urls, parent);
1.55 - try {
1.56 - getLoaders(); //proactive check that URLClassLoader is as expected
1.57 - } catch (Throwable t) {
1.58 - throw new Error("cannot create CloseableURLClassLoader", t);
1.59 - }
1.60 - }
1.61 -
1.62 - /**
1.63 - * Close any jar files that may have been opened by the class loader.
1.64 - * Reflection is used to access the jar files in the URLClassLoader's
1.65 - * internal data structures.
1.66 - * @throws java.io.IOException if the jar files cannot be found for any
1.67 - * reson, or if closing the jar file itself causes an IOException.
1.68 - */
1.69 - public void close() throws IOException {
1.70 - try {
1.71 - for (Object l: getLoaders()) {
1.72 - if (l.getClass().getName().equals("sun.misc.URLClassPath$JarLoader")) {
1.73 - Field jarField = l.getClass().getDeclaredField("jar");
1.74 - JarFile jar = (JarFile) getField(l, jarField);
1.75 - if (jar != null) {
1.76 - //System.err.println("CloseableURLClassLoader: closing " + jar);
1.77 - jar.close();
1.78 - }
1.79 - }
1.80 - }
1.81 - } catch (Throwable t) {
1.82 - IOException e = new IOException("cannot close class loader");
1.83 - e.initCause(t);
1.84 - throw e;
1.85 - }
1.86 - }
1.87 -
1.88 - private ArrayList<?> getLoaders()
1.89 - throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException
1.90 - {
1.91 - Field ucpField = URLClassLoader.class.getDeclaredField("ucp");
1.92 - Object urlClassPath = getField(this, ucpField);
1.93 - if (urlClassPath == null)
1.94 - throw new AssertionError("urlClassPath not set in URLClassLoader");
1.95 - Field loadersField = urlClassPath.getClass().getDeclaredField("loaders");
1.96 - return (ArrayList<?>) getField(urlClassPath, loadersField);
1.97 - }
1.98 -
1.99 - private Object getField(Object o, Field f)
1.100 - throws IllegalArgumentException, IllegalAccessException {
1.101 - boolean prev = f.isAccessible();
1.102 - try {
1.103 - f.setAccessible(true);
1.104 - return f.get(o);
1.105 - } finally {
1.106 - f.setAccessible(prev);
1.107 - }
1.108 - }
1.109 -
1.110 -}
