| /* |
| * Copyright (c) 2000, 2012, 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 |
| * @bug 6191269 6709457 8000330 |
| * @summary Test truncate method of FileChannel |
| * @key randomness |
| */ |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.*; |
| import java.nio.file.Files; |
| import static java.nio.file.StandardOpenOption.*; |
| import static java.nio.charset.StandardCharsets.*; |
| import java.util.Random; |
| |
| |
| /** |
| * Testing FileChannel's truncate method. |
| */ |
| |
| public class Truncate { |
| private static final Random generator = new Random(); |
| |
| public static void main(String[] args) throws Exception { |
| File blah = File.createTempFile("blah", null); |
| blah.deleteOnExit(); |
| try { |
| basicTest(blah); |
| appendTest(blah); |
| exceptionTests(blah); |
| } finally { |
| blah.delete(); |
| } |
| } |
| |
| /** |
| * Basic test of asserts in truncate's specification. |
| */ |
| static void basicTest(File blah) throws Exception { |
| for(int i=0; i<100; i++) { |
| long testSize = generator.nextInt(1000) + 10; |
| initTestFile(blah, testSize); |
| |
| try (FileChannel fc = (i < 50) ? |
| new RandomAccessFile(blah, "rw").getChannel() : |
| FileChannel.open(blah.toPath(), READ, WRITE)) |
| { |
| if (fc.size() != testSize) |
| throw new RuntimeException("Size failed"); |
| |
| long position = generator.nextInt((int)testSize*2); |
| fc.position(position); |
| |
| long newSize = generator.nextInt((int)testSize*2); |
| fc.truncate(newSize); |
| |
| // check new size |
| if (newSize > testSize) { |
| if (fc.size() != testSize) |
| throw new RuntimeException("Attempt to expand file changed size"); |
| } else { |
| if (fc.size() != newSize) |
| throw new RuntimeException("Unexpected size after truncate"); |
| } |
| |
| // check new position |
| if (position > newSize) { |
| if (fc.position() != newSize) |
| throw new RuntimeException("Position greater than size"); |
| } else { |
| if (fc.position() != position) |
| throw new RuntimeException("Truncate changed position"); |
| }; |
| } |
| } |
| } |
| |
| /** |
| * Test behavior of truncate method when file is opened for append |
| */ |
| static void appendTest(File blah) throws Exception { |
| for (int i=0; i<10; i++) { |
| long testSize = generator.nextInt(1000) + 10; |
| initTestFile(blah, testSize); |
| try (FileChannel fc = (i < 5) ? |
| new FileOutputStream(blah, true).getChannel() : |
| FileChannel.open(blah.toPath(), APPEND)) |
| { |
| // truncate file |
| long newSize = generator.nextInt((int)testSize); |
| fc.truncate(newSize); |
| if (fc.size() != newSize) |
| throw new RuntimeException("Truncate failed"); |
| |
| // write one byte |
| ByteBuffer buf = ByteBuffer.allocate(1); |
| buf.put((byte)'x'); |
| buf.flip(); |
| fc.write(buf); |
| if (fc.size() != (newSize+1)) |
| throw new RuntimeException("Unexpected size"); |
| } |
| } |
| } |
| |
| /** |
| * Test exceptions specified by truncate method |
| */ |
| static void exceptionTests(File blah) throws Exception { |
| // check exceptions when channel opened for read access |
| try (FileChannel fc = FileChannel.open(blah.toPath(), READ)) { |
| long size = fc.size(); |
| |
| // open channel |
| checkException(fc, 0L, NonWritableChannelException.class); |
| |
| checkException(fc, -1L, NonWritableChannelException.class, |
| IllegalArgumentException.class); |
| |
| checkException(fc, size+1L, NonWritableChannelException.class); |
| |
| // closed channel |
| fc.close(); |
| |
| checkException(fc, 0L, ClosedChannelException.class); |
| |
| checkException(fc, -1L, ClosedChannelException.class, |
| IllegalArgumentException.class); |
| |
| checkException(fc, size+1L, ClosedChannelException.class); |
| } |
| |
| // check exceptions when channel opened for write access |
| try (FileChannel fc = FileChannel.open(blah.toPath(), WRITE)) { |
| long size = fc.size(); |
| |
| // open channel |
| checkException(fc, -1L, IllegalArgumentException.class); |
| |
| // closed channel |
| fc.close(); |
| |
| checkException(fc, 0L, ClosedChannelException.class); |
| |
| checkException(fc, -1L, ClosedChannelException.class, |
| IllegalArgumentException.class); |
| |
| checkException(fc, size+1L, ClosedChannelException.class); |
| } |
| } |
| |
| /** |
| * Checks that FileChannel truncate throws one of the expected exceptions |
| * when invoked with the given size. |
| */ |
| private static void checkException(FileChannel fc, long size, Class<?>... expected) |
| throws IOException |
| { |
| Exception exc = null; |
| try { |
| fc.truncate(size); |
| } catch (Exception actual) { |
| exc = actual; |
| } |
| if (exc != null) { |
| for (Class<?> clazz: expected) { |
| if (clazz.isInstance(exc)) { |
| return; |
| } |
| } |
| } |
| System.err.println("Expected one of"); |
| for (Class<?> clazz: expected) { |
| System.err.println(clazz); |
| } |
| if (exc == null) { |
| throw new RuntimeException("No expection thrown"); |
| } else { |
| throw new RuntimeException("Unexpected exception thrown", exc); |
| } |
| } |
| |
| /** |
| * Creates file blah of specified size in bytes. |
| */ |
| private static void initTestFile(File blah, long size) throws Exception { |
| try (BufferedWriter writer = Files.newBufferedWriter(blah.toPath(), ISO_8859_1)) { |
| for(int i=0; i<size; i++) { |
| writer.write("e"); |
| } |
| } |
| } |
| } |