133 lines
4.4 KiB
Java
133 lines
4.4 KiB
Java
/*
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* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package compiler.jsr292.methodHandleExceptions;
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import java.io.BufferedOutputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.util.jar.JarEntry;
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import java.util.jar.JarOutputStream;
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/**
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* A ByteClassLoader is used to define classes from collections of bytes, as
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* well as loading classes in the usual way. It includes options to write the
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* classes to files in a jar, or to read the classes from jars in a later or
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* debugging run.
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*
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* If Boolean property byteclassloader.verbose is true, be chatty about jar
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* file operations.
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*
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*/
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public class ByteClassLoader extends URLClassLoader {
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final static boolean verbose
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= Boolean.getBoolean("byteclassloader.verbose");
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final boolean read;
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final JarOutputStream jos;
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final String jar_name;
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/**
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* Make a new ByteClassLoader.
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*
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* @param jar_name Basename of jar file to be read/written by this classloader.
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* @param read If true, read classes from jar file instead of from parameter.
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* @param write If true, write classes to jar files for offline study/use.
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*
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* @throws FileNotFoundException
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* @throws IOException
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*/
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public ByteClassLoader(String jar_name, boolean read, boolean write)
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throws FileNotFoundException, IOException {
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super(read
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? new URL[]{new URL("file:" + jar_name + ".jar")}
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: new URL[0]);
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this.read = read;
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this.jar_name = jar_name;
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this.jos = write
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? new JarOutputStream(
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new BufferedOutputStream(
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new FileOutputStream(jar_name + ".jar"))) : null;
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if (read && write) {
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throw new Error("At most one of read and write may be true.");
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}
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}
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private static void writeJarredFile(JarOutputStream jos, String file, String suffix, byte[] bytes) {
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String fileName = file.replace(".", "/") + "." + suffix;
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JarEntry ze = new JarEntry(fileName);
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try {
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ze.setSize(bytes.length);
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jos.putNextEntry(ze);
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jos.write(bytes);
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jos.closeEntry();
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* (pre)load class name using classData for the definition.
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*
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* @param name
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* @param classData
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* @return
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*/
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public Class<?> loadBytes(String name, byte[] classData) throws ClassNotFoundException {
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if (jos != null) {
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if (verbose) {
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System.out.println("ByteClassLoader: writing " + name);
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}
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writeJarredFile(jos, name, "class", classData);
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}
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Class<?> clazz = null;
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if (read) {
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if (verbose) {
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System.out.println("ByteClassLoader: reading " + name + " from " + jar_name);
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}
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clazz = loadClass(name);
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} else {
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clazz = defineClass(name, classData, 0, classData.length);
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resolveClass(clazz);
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}
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return clazz;
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}
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public void close() {
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if (jos != null) {
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try {
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if (verbose) {
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System.out.println("ByteClassLoader: closing " + jar_name);
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}
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jos.close();
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} catch (IOException ex) {
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}
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}
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}
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}
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