/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hdfs.util;
import static org.junit.Assert.*;
import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.hdfs.util.ExactSizeInputStream;
import org.junit.Test;
public class TestExactSizeInputStream {
@Test
public void testBasicsReadSingle() throws IOException {
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("hello"), 3);
assertEquals(3, s.available());
assertEquals((int)'h', s.read());
assertEquals((int)'e', s.read());
assertEquals((int)'l', s.read());
assertEquals(-1, s.read());
assertEquals(0, s.available());
}
@Test
public void testBasicsReadArray() throws IOException {
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("hello"), 3);
assertEquals(3, s.available());
byte[] buf = new byte[10];
assertEquals(2, s.read(buf, 0, 2));
assertEquals('h', buf[0]);
assertEquals('e', buf[1]);
assertEquals(1, s.read(buf, 0, 2));
assertEquals('l', buf[0]);
assertEquals(-1, s.read(buf, 0, 2));
}
@Test
public void testBasicsSkip() throws IOException {
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("hello"), 3);
assertEquals(3, s.available());
assertEquals(2, s.skip(2));
assertEquals(1, s.skip(2));
assertEquals(0, s.skip(2));
}
@Test
public void testReadNotEnough() throws IOException {
// Ask for 5 bytes, only has 2
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
assertEquals(2, s.available());
assertEquals((int)'h', s.read());
assertEquals((int)'e', s.read());
try {
s.read();
fail("Read when should be out of data");
} catch (EOFException e) {
// expected
}
}
@Test
public void testSkipNotEnough() throws IOException {
// Ask for 5 bytes, only has 2
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
assertEquals(2, s.skip(3));
try {
s.skip(1);
fail("Skip when should be out of data");
} catch (EOFException e) {
// expected
}
}
@Test
public void testReadArrayNotEnough() throws IOException {
// Ask for 5 bytes, only has 2
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
byte[] buf = new byte[10];
assertEquals(2, s.read(buf, 0, 5));
try {
s.read(buf, 2, 3);
fail("Read buf when should be out of data");
} catch (EOFException e) {
// expected
}
}
@Test
public void testMark() throws IOException {
ExactSizeInputStream s = new ExactSizeInputStream(byteStream("he"), 5);
assertFalse(s.markSupported());
try {
s.mark(1);
fail("Mark should not succeed");
} catch (UnsupportedOperationException uoe) {
// expected
}
}
private static InputStream byteStream(String data) {
return new ByteArrayInputStream(data.getBytes());
}
}