| /* |
| * Copyright (c) 2015, 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. |
| */ |
| |
| import java.io.BufferedReader; |
| import java.io.ByteArrayInputStream; |
| import java.io.CharArrayReader; |
| import java.io.File; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.LineNumberReader; |
| import java.io.PipedReader; |
| import java.io.PipedWriter; |
| import java.io.PushbackReader; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.io.UncheckedIOException; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.function.Function; |
| |
| import static java.lang.String.format; |
| |
| /* |
| * @test |
| * @bug 8029689 |
| * @summary checks the bounds part of the contract of java.io.Reader.read(char[], int, int): |
| * |
| * 0 <= off <= off+len <= cbuf.length |
| * |
| * for publicly exported subtypes of java.io.Reader |
| */ |
| public class ReaderBulkReadContract { |
| |
| public static void main(String[] args) throws IOException { |
| ReaderBulkReadContract t = new ReaderBulkReadContract(); |
| t.test(); |
| } |
| |
| private void test() throws IOException { |
| Iterator<Object[]> args = args(); |
| while (args.hasNext()) { |
| Object[] a = args.next(); |
| Reader r = (Reader) a[0]; |
| int size = (int) a[1]; |
| int off = (int) a[2]; |
| int len = (int) a[3]; |
| try { |
| read(r, size, off, len); |
| } finally { |
| r.close(); |
| } |
| } |
| } |
| |
| private Iterator<Object[]> args() { |
| |
| Integer[] lens = {Integer.MIN_VALUE, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, Integer.MAX_VALUE}; |
| Integer[] offs = {Integer.MIN_VALUE, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, Integer.MAX_VALUE}; |
| Integer[] sizes = {0, 1, 2, 3, 4, 5}; |
| String[] contents = {"", "a", "ab"}; |
| |
| List<Function<String, Reader>> fs = Arrays.asList( |
| (String s) -> new BufferedReader(new StringReader(s)), |
| (String s) -> new LineNumberReader(new StringReader(s)), |
| (String s) -> new CharArrayReader(s.toCharArray()), |
| (String s) -> new InputStreamReader(new ByteArrayInputStream(s.getBytes())), |
| (String s) -> newFileReader(s), |
| (String s) -> new PushbackReader(new StringReader(s)), |
| (String s) -> newPipedReader(s), |
| (String s) -> new StringReader(s) |
| ); |
| |
| // The easiest way to produce a cartesian product from a small fixed number of sets |
| List<Object[]> tuples = Collections.synchronizedList(new LinkedList<>()); |
| for (Integer len : lens) |
| for (Integer off : offs) |
| for (String s : contents) |
| for (Integer size : sizes) |
| for (Function<String, Reader> f : fs) |
| tuples.add(new Object[]{f.apply(s), size, off, len}); |
| |
| return tuples.iterator(); |
| } |
| |
| private void read(Reader r, int size, int off, int len) throws IOException { |
| IndexOutOfBoundsException ex = null; |
| try { |
| r.read(new char[size], off, len); |
| } catch (IndexOutOfBoundsException e) { |
| ex = e; |
| } |
| |
| boolean incorrectBounds = off < 0 || len < 0 || len > size - off; |
| boolean exceptionThrown = ex != null; |
| |
| if (incorrectBounds != exceptionThrown) { // incorrectBounds iff exceptionThrown |
| throw new AssertionError(format("r=%s, size=%s, off=%s, len=%s, incorrectBounds=%s, exceptionThrown=%s", |
| r, size, off, len, incorrectBounds, exceptionThrown)); |
| } |
| } |
| |
| private static PipedReader newPipedReader(String contents) { |
| try (PipedWriter w = new PipedWriter()) { |
| PipedReader r = new PipedReader(w); |
| w.write(contents); |
| return r; |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| |
| private FileReader newFileReader(String contents) { |
| try { |
| // To not create an enormous amount of files |
| File f = cache.computeIfAbsent(contents, |
| ReaderBulkReadContract::createTempFileWithContents); |
| return new FileReader(f); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| |
| private static File createTempFileWithContents(String contents) { |
| try { |
| File testDir = new File(System.getProperty("test.dir", ".")); |
| File file = File.createTempFile("ReaderContract", "", testDir); |
| try (FileWriter w = new FileWriter(file)) { |
| w.write(contents); |
| } |
| return file; |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| |
| // |
| // To avoid myriads of tiny files a cache is used. |
| // ConcurrentHashMap.computeIfAbsent promises a crucial thing: |
| // |
| // ...The entire method invocation is performed atomically, so the |
| // function is applied at most once per key... |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| private final ConcurrentHashMap<String, File> cache = new ConcurrentHashMap<>(); |
| } |