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test/compiler/jsr292/methodHandleExceptions/ByteClassLoader.java@f90c822e73f8 (annotated)

test/compiler/jsr292/methodHandleExceptions/ByteClassLoader.java

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	import java.io.BufferedOutputStream;
aoqi@0	2	import java.io.FileNotFoundException;
aoqi@0	3	import java.io.FileOutputStream;
aoqi@0	4	import java.io.IOException;
aoqi@0	5	import java.net.URL;
aoqi@0	6	import java.net.URLClassLoader;
aoqi@0	7	import java.util.jar.JarEntry;
aoqi@0	8	import java.util.jar.JarOutputStream;
aoqi@0	9
aoqi@0	10	/*
aoqi@0	11	* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	12	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	13	*
aoqi@0	14	* This code is free software; you can redistribute it and/or modify it
aoqi@0	15	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	16	* published by the Free Software Foundation.
aoqi@0	17	*
aoqi@0	18	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	19	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	20	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	21	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	22	* accompanied this code).
aoqi@0	23	*
aoqi@0	24	* You should have received a copy of the GNU General Public License version
aoqi@0	25	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	26	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	27	*
aoqi@0	28	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	29	* or visit www.oracle.com if you need additional information or have any
aoqi@0	30	* questions.
aoqi@0	31	*
aoqi@0	32	*/
aoqi@0	33
aoqi@0	34	/**
aoqi@0	35	* A ByteClassLoader is used to define classes from collections of bytes, as
aoqi@0	36	* well as loading classes in the usual way. It includes options to write the
aoqi@0	37	* classes to files in a jar, or to read the classes from jars in a later or
aoqi@0	38	* debugging run.
aoqi@0	39	*
aoqi@0	40	* If Boolean property byteclassloader.verbose is true, be chatty about jar
aoqi@0	41	* file operations.
aoqi@0	42	*
aoqi@0	43	*/
aoqi@0	44	public class ByteClassLoader extends URLClassLoader {
aoqi@0	45
aoqi@0	46	final static boolean verbose
aoqi@0	47	= Boolean.getBoolean("byteclassloader.verbose");
aoqi@0	48
aoqi@0	49	final boolean read;
aoqi@0	50	final JarOutputStream jos;
aoqi@0	51	final String jar_name;
aoqi@0	52
aoqi@0	53	/**
aoqi@0	54	* Make a new ByteClassLoader.
aoqi@0	55	*
aoqi@0	56	* @param jar_name Basename of jar file to be read/written by this classloader.
aoqi@0	57	* @param read If true, read classes from jar file instead of from parameter.
aoqi@0	58	* @param write If true, write classes to jar files for offline study/use.
aoqi@0	59	*
aoqi@0	60	* @throws FileNotFoundException
aoqi@0	61	* @throws IOException
aoqi@0	62	*/
aoqi@0	63	public ByteClassLoader(String jar_name, boolean read, boolean write)
aoqi@0	64	throws FileNotFoundException, IOException {
aoqi@0	65	super(read
aoqi@0	66	? new URL[]{new URL("file:" + jar_name + ".jar")}
aoqi@0	67	: new URL[0]);
aoqi@0	68	this.read = read;
aoqi@0	69	this.jar_name = jar_name;
aoqi@0	70	this.jos = write
aoqi@0	71	? new JarOutputStream(
aoqi@0	72	new BufferedOutputStream(
aoqi@0	73	new FileOutputStream(jar_name + ".jar"))) : null;
aoqi@0	74	if (read && write) {
aoqi@0	75	throw new Error("At most one of read and write may be true.");
aoqi@0	76	}
aoqi@0	77	}
aoqi@0	78
aoqi@0	79	private static void writeJarredFile(JarOutputStream jos, String file, String suffix, byte[] bytes) {
aoqi@0	80	String fileName = file.replace(".", "/") + "." + suffix;
aoqi@0	81	JarEntry ze = new JarEntry(fileName);
aoqi@0	82	try {
aoqi@0	83	ze.setSize(bytes.length);
aoqi@0	84	jos.putNextEntry(ze);
aoqi@0	85	jos.write(bytes);
aoqi@0	86	jos.closeEntry();
aoqi@0	87	} catch (IOException e) {
aoqi@0	88	throw new RuntimeException(e);
aoqi@0	89	}
aoqi@0	90	}
aoqi@0	91
aoqi@0	92	/**
aoqi@0	93	* (pre)load class name using classData for the definition.
aoqi@0	94	*
aoqi@0	95	* @param name
aoqi@0	96	* @param classData
aoqi@0	97	* @return
aoqi@0	98	*/
aoqi@0	99	public Class<?> loadBytes(String name, byte[] classData) throws ClassNotFoundException {
aoqi@0	100	if (jos != null) {
aoqi@0	101	if (verbose) {
aoqi@0	102	System.out.println("ByteClassLoader: writing " + name);
aoqi@0	103	}
aoqi@0	104	writeJarredFile(jos, name, "class", classData);
aoqi@0	105	}
aoqi@0	106
aoqi@0	107	Class<?> clazz = null;
aoqi@0	108	if (read) {
aoqi@0	109	if (verbose) {
aoqi@0	110	System.out.println("ByteClassLoader: reading " + name + " from " + jar_name);
aoqi@0	111	}
aoqi@0	112	clazz = loadClass(name);
aoqi@0	113	} else {
aoqi@0	114	clazz = defineClass(name, classData, 0, classData.length);
aoqi@0	115	resolveClass(clazz);
aoqi@0	116	}
aoqi@0	117	return clazz;
aoqi@0	118	}
aoqi@0	119
aoqi@0	120	public void close() {
aoqi@0	121	if (jos != null) {
aoqi@0	122	try {
aoqi@0	123	if (verbose) {
aoqi@0	124	System.out.println("ByteClassLoader: closing " + jar_name);
aoqi@0	125	}
aoqi@0	126	jos.close();
aoqi@0	127	} catch (IOException ex) {
aoqi@0	128	}
aoqi@0	129	}
aoqi@0	130	}
aoqi@0	131	}