• file
• revisions
• annotate
• diff
• comparison
• raw

test/tools/javac/versions/CheckClassFileVersion.java@2eb010b6cb22 (annotated)

test/tools/javac/versions/CheckClassFileVersion.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 554

9d9f26857129

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	import java.io.*;
aoqi@0	25	import java.nio.*;
aoqi@0	26	import java.nio.channels.*;
aoqi@0	27
aoqi@0	28
aoqi@0	29	public class CheckClassFileVersion {
aoqi@0	30
aoqi@0	31	static String get(String fn) throws IOException {
aoqi@0	32	ByteBuffer bb = ByteBuffer.allocate(1024);
aoqi@0	33	FileChannel fc = new FileInputStream(fn).getChannel();
aoqi@0	34	try {
aoqi@0	35	bb.clear();
aoqi@0	36	if (fc.read(bb) < 0)
aoqi@0	37	throw new IOException("Could not read any bytes");
aoqi@0	38	bb.flip();
aoqi@0	39	int minor = bb.getShort(4);
aoqi@0	40	int major = bb.getShort(6);
aoqi@0	41	return major + "." + minor;
aoqi@0	42	} finally {
aoqi@0	43	fc.close();
aoqi@0	44	}
aoqi@0	45	}
aoqi@0	46
aoqi@0	47	public static void main(String[] args) throws IOException {
aoqi@0	48	String cfv = get(args[0]);
aoqi@0	49	if (args.length == 1) {
aoqi@0	50	System.out.println(cfv);
aoqi@0	51	return;
aoqi@0	52	}
aoqi@0	53	if (!cfv.equals(args[1])) {
aoqi@0	54	System.err.println("Class-file version mismatch: Expected "
aoqi@0	55	+ args[1] + ", got " + cfv);
aoqi@0	56	System.exit(1);
aoqi@0	57	}
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	}