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/*
* Copyright (c) 2021, 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 4926314 8266014
* @summary Test for Reader#read(CharBuffer).
* @run testng ReadCharBuffer
*/
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.CharArrayReader;
import java.io.Reader;
import java.io.UncheckedIOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.Arrays;
import java.util.Objects;
import static org.testng.Assert.assertEquals;
@Test(groups = "unit")
public class ReadCharBuffer {
private static final int BUFFER_SIZE = 8 + 8192 + 2;
@DataProvider(name = "buffers")
public Object[][] createBuffers() {
// test both on-heap and off-heap buffers as they make use different code paths
return new Object[][]{
new Object[]{CharBuffer.allocate(BUFFER_SIZE)},
new Object[]{ByteBuffer.allocateDirect(BUFFER_SIZE * 2).asCharBuffer()}
};
}
@Test(dataProvider = "buffers")
public void read(CharBuffer buffer) throws IOException {
fillBuffer(buffer);
StringBuilder input = new StringBuilder(BUFFER_SIZE - 2 + 1);
input.append("ABCDEF");
for (int i = 0; i < 8192; i++) {
input.append('y');
}
input.append("GH");
try (Reader reader = new UnoptimizedStringReader(input.toString())) {
// put only between position and limit in the target buffer
int limit = 1 + 6;
buffer.limit(limit);
buffer.position(1);
assertEquals(reader.read(buffer), 6);
assertEquals(buffer.position(), limit);
assertEquals(buffer.limit(), limit);
// read the full temporary buffer
// and then accurately reduce the next #read call
limit = 8 + 8192 + 1;
buffer.limit(8 + 8192 + 1);
buffer.position(8);
assertEquals(reader.read(buffer), 8192 + 1);
assertEquals(buffer.position(), limit);
assertEquals(buffer.limit(), limit);
assertEquals(reader.read(), 'H');
assertEquals(reader.read(), -1);
}
buffer.clear();
StringBuilder expected = new StringBuilder(BUFFER_SIZE);
expected.append("xABCDEFx");
for (int i = 0; i < 8192; i++) {
expected.append('y');
}
expected.append("Gx");
assertEquals(buffer.toString(), expected.toString());
}
@Test
public void readZeroLength() {
char[] buf = new char[] {1, 2, 3};
BufferedReader r = new BufferedReader(new CharArrayReader(buf));
int n = -1;
try {
n = r.read(CharBuffer.allocate(0));
} catch (IOException e) {
throw new UncheckedIOException(e);
}
assertEquals(n, 0);
}
private void fillBuffer(CharBuffer buffer) {
char[] filler = new char[buffer.remaining()];
Arrays.fill(filler, 'x');
buffer.put(filler);
buffer.clear();
}
/**
* Unoptimized version of StringReader in case StringReader overrides
* #read(CharBuffer)
*/
static final class UnoptimizedStringReader extends Reader {
private String str;
private int next = 0;
UnoptimizedStringReader(String s) {
this.str = s;
}
@Override
public int read() throws IOException {
synchronized (lock) {
if (next >= str.length())
return -1;
return str.charAt(next++);
}
}
@Override
public int read(char cbuf[], int off, int len) throws IOException {
synchronized (lock) {
Objects.checkFromIndexSize(off, len, cbuf.length);
if (next >= str.length())
return -1;
int n = Math.min(str.length() - next, len);
str.getChars(next, next + n, cbuf, off);
next += n;
return n;
}
}
@Override
public void close() throws IOException {
}
}
}
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