| /* |
| * Copyright (c) 1998, 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 4090383 |
| @summary Ensure that BufferedReader's read method will fill the target array |
| whenever possible |
| */ |
| |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.BufferedReader; |
| |
| |
| public class Fill { |
| |
| /** |
| * A simple Reader that is always ready but may read fewer than the |
| * requested number of characters |
| */ |
| static class Source extends Reader { |
| |
| int shortFall; |
| char next = 0; |
| |
| Source(int shortFall) { |
| this.shortFall = shortFall; |
| } |
| |
| public int read(char[] cbuf, int off, int len) throws IOException { |
| int n = len - shortFall; |
| for (int i = off; i < n; i++) |
| cbuf[i] = next++; |
| return n; |
| } |
| |
| public boolean ready() { |
| return true; |
| } |
| |
| public void close() throws IOException { |
| } |
| |
| } |
| |
| /** |
| * Test BufferedReader with an underlying source that always reads |
| * shortFall fewer characters than requested |
| */ |
| static void go(int shortFall) throws Exception { |
| |
| Reader r = new BufferedReader(new Source(shortFall), 10); |
| char[] cbuf = new char[8]; |
| |
| int n1 = r.read(cbuf); |
| int n2 = r.read(cbuf); |
| System.err.println("Shortfall " + shortFall |
| + ": Read " + n1 + ", then " + n2 + " chars"); |
| if (n1 != cbuf.length) |
| throw new Exception("First read returned " + n1); |
| if (n2 != cbuf.length) |
| throw new Exception("Second read returned " + n2); |
| |
| } |
| |
| public static void main(String[] args) throws Exception { |
| for (int i = 0; i < 8; i++) go(i); |
| } |
| |
| } |