| /* |
| * Copyright (c) 1997, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| @summary General tests of the setLength method -- Should migrate to 1.2 JCK |
| */ |
| |
| import java.io.*; |
| |
| |
| public class SetLength { |
| |
| static void fail(String s) { |
| throw new RuntimeException(s); |
| } |
| |
| static void go(File fn, int max) throws IOException { |
| int chunk = max / 4; |
| long i; |
| RandomAccessFile f; |
| |
| f = new RandomAccessFile(fn, "rw"); |
| f.setLength(2 * chunk); |
| if (f.length() != 2 * chunk) fail("Length not increased to " + (2 * chunk)); |
| if ((i = f.getFilePointer()) != 0) fail("File pointer shifted to " + i); |
| byte[] buf = new byte[max]; |
| f.write(buf); |
| if (f.length() != max) fail("Write didn't work"); |
| if (f.getFilePointer() != max) fail("File pointer inconsistent"); |
| f.setLength(3 * chunk); |
| if (f.length() != 3 * chunk) fail("Length not reduced to " + 3 * chunk); |
| if (f.getFilePointer() != 3 * chunk) fail("File pointer not shifted to " + (3 * chunk)); |
| f.seek(1 * chunk); |
| if (f.getFilePointer() != 1 * chunk) fail("File pointer not shifted to " + (1 * chunk)); |
| f.setLength(2 * chunk); |
| if (f.length() != 2 * chunk) fail("Length not reduced to " + (2 * chunk)); |
| if (f.getFilePointer() != 1 * chunk) fail("File pointer not shifted to " + (1 * chunk)); |
| f.close(); |
| } |
| |
| public static void main(String[] args) throws IOException { |
| File fn = new File("x.SetLength"); |
| try { |
| go(fn, 20); |
| fn.delete(); |
| go(fn, 64 * 1024); |
| RandomAccessFile f = new RandomAccessFile(fn, "r"); |
| boolean thrown = false; |
| try { |
| f.setLength(3); |
| } catch (IOException x) { |
| thrown = true; |
| } |
| if (!thrown) fail("setLength succeeded on a file opened read-only"); |
| f.close(); |
| } |
| finally { |
| fn.delete(); |
| } |
| } |
| |
| } |