1 /* 2 * Copyright (c) 2000, 2011, 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 /* @test 25 * @bug 4429043 6526860 26 * @summary Test position method of FileChannel 27 */ 28 29 import java.io.*; 30 import java.nio.ByteBuffer; 31 import java.nio.channels.FileChannel; 32 import java.nio.file.*; 33 import static java.nio.file.StandardOpenOption.*; 34 import java.nio.charset.Charset; 35 import java.util.Random; 36 37 38 /** 39 * Testing FileChannel's position method. 40 */ 41 42 public class Position { 43 44 private static final Charset ISO8859_1 = Charset.forName("8859_1"); 45 46 private static final Random generator = new Random(); 47 48 public static void main(String[] args) throws Exception { 49 Path blah = Files.createTempFile("blah", null); 50 blah.toFile().deleteOnExit(); 51 initTestFile(blah); 52 53 for (int i=0; i<10; i++) { 54 try (FileChannel fc = (generator.nextBoolean()) ? 55 FileChannel.open(blah, READ) : 56 new FileInputStream(blah.toFile()).getChannel()) { 57 for (int j=0; j<100; j++) { 58 long newPos = generator.nextInt(1000); 59 fc.position(newPos); 60 if (fc.position() != newPos) 61 throw new RuntimeException("Position failed"); 62 } 63 } 64 } 65 66 for (int i=0; i<10; i++) { 67 try (FileChannel fc = (generator.nextBoolean()) ? 68 FileChannel.open(blah, APPEND) : 69 new FileOutputStream(blah.toFile(), true).getChannel()) { 70 for (int j=0; j<10; j++) { 71 if (fc.position() != fc.size()) 72 throw new RuntimeException("Position expected to be size"); 73 byte[] buf = new byte[generator.nextInt(100)]; 74 fc.write(ByteBuffer.wrap(buf)); 75 } 76 } 77 } 78 79 Files.delete(blah); 80 } 81 82 /** 83 * Creates file blah: 84 * 0000 85 * 0001 86 * 0002 87 * 0003 88 * . 89 * . 90 * . 91 * 3999 92 * 93 */ 94 private static void initTestFile(Path blah) throws IOException { 95 try (BufferedWriter awriter = Files.newBufferedWriter(blah, ISO8859_1)) { 96 for(int i=0; i<4000; i++) { 97 String number = new Integer(i).toString(); 98 for (int h=0; h<4-number.length(); h++) 99 awriter.write("0"); 100 awriter.write(""+i); 101 awriter.newLine(); 102 } 103 } 104 } 105 }