| /** |
| * 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()); |
| } |
| } |