Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: test/tools/javac/versions/CheckClassFileVersion.java
test/tools/javac/versions/CheckClassFileVersion.java
- changeset 0
- 959103a6100f
- child 2525
- 2eb010b6cb22
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| -1:000000000000 | 0:959103a6100f |
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| 1 /* | |
| 2 * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 */ | |
| 23 | |
| 24 import java.io.*; | |
| 25 import java.nio.*; | |
| 26 import java.nio.channels.*; | |
| 27 | |
| 28 | |
| 29 public class CheckClassFileVersion { | |
| 30 | |
| 31 static String get(String fn) throws IOException { | |
| 32 ByteBuffer bb = ByteBuffer.allocate(1024); | |
| 33 FileChannel fc = new FileInputStream(fn).getChannel(); | |
| 34 try { | |
| 35 bb.clear(); | |
| 36 if (fc.read(bb) < 0) | |
| 37 throw new IOException("Could not read any bytes"); | |
| 38 bb.flip(); | |
| 39 int minor = bb.getShort(4); | |
| 40 int major = bb.getShort(6); | |
| 41 return major + "." + minor; | |
| 42 } finally { | |
| 43 fc.close(); | |
| 44 } | |
| 45 } | |
| 46 | |
| 47 public static void main(String[] args) throws IOException { | |
| 48 String cfv = get(args[0]); | |
| 49 if (args.length == 1) { | |
| 50 System.out.println(cfv); | |
| 51 return; | |
| 52 } | |
| 53 if (!cfv.equals(args[1])) { | |
| 54 System.err.println("Class-file version mismatch: Expected " | |
| 55 + args[1] + ", got " + cfv); | |
| 56 System.exit(1); | |
| 57 } | |
| 58 } | |
| 59 | |
| 60 } |
