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Java example source code file (ByteBufStreamTest.java)

This example Java source code file (ByteBufStreamTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

bytebufinputstream, bytebufoutputstream, charset, eofexception, hello, illegalargumentexception, indexoutofboundsexception, iso-8859-1, nullpointerexception, string, test, the, utf-8, world

The ByteBufStreamTest.java Java example source code

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 io.netty.buffer;

import org.junit.Test;

import java.io.EOFException;
import java.nio.charset.Charset;

import static io.netty.util.internal.EmptyArrays.*;
import static org.junit.Assert.*;

/**
 * Tests channel buffer streams
 */
public class ByteBufStreamTest {

    @Test
    public void testAll() throws Exception {
        ByteBuf buf = Unpooled.buffer(0, 65536);

        try {
            new ByteBufOutputStream(null);
            fail();
        } catch (NullPointerException e) {
            // Expected
        }

        ByteBufOutputStream out = new ByteBufOutputStream(buf);
        assertSame(buf, out.buffer());
        out.writeBoolean(true);
        out.writeBoolean(false);
        out.writeByte(42);
        out.writeByte(224);
        out.writeBytes("Hello, World!");
        out.writeChars("Hello, World");
        out.writeChar('!');
        out.writeDouble(42.0);
        out.writeFloat(42.0f);
        out.writeInt(42);
        out.writeLong(42);
        out.writeShort(42);
        out.writeShort(49152);
        out.writeUTF("Hello, World!");
        out.writeBytes("The first line\r\r\n");
        out.write(EMPTY_BYTES);
        out.write(new byte[] { 1, 2, 3, 4 });
        out.write(new byte[] { 1, 3, 3, 4 }, 0, 0);
        out.close();

        try {
            new ByteBufInputStream(null);
            fail();
        } catch (NullPointerException e) {
            // Expected
        }

        try {
            new ByteBufInputStream(null, 0);
            fail();
        } catch (NullPointerException e) {
            // Expected
        }

        try {
            new ByteBufInputStream(buf, -1);
        } catch (IllegalArgumentException e) {
            // Expected
        }

        try {
            new ByteBufInputStream(buf, buf.capacity() + 1);
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }

        ByteBufInputStream in = new ByteBufInputStream(buf);

        assertTrue(in.markSupported());
        in.mark(Integer.MAX_VALUE);

        assertEquals(buf.writerIndex(), in.skip(Long.MAX_VALUE));
        assertFalse(buf.isReadable());

        in.reset();
        assertEquals(0, buf.readerIndex());

        assertEquals(4, in.skip(4));
        assertEquals(4, buf.readerIndex());
        in.reset();

        assertTrue(in.readBoolean());
        assertFalse(in.readBoolean());
        assertEquals(42, in.readByte());
        assertEquals(224, in.readUnsignedByte());

        byte[] tmp = new byte[13];
        in.readFully(tmp);
        assertEquals("Hello, World!", new String(tmp, "ISO-8859-1"));

        assertEquals('H', in.readChar());
        assertEquals('e', in.readChar());
        assertEquals('l', in.readChar());
        assertEquals('l', in.readChar());
        assertEquals('o', in.readChar());
        assertEquals(',', in.readChar());
        assertEquals(' ', in.readChar());
        assertEquals('W', in.readChar());
        assertEquals('o', in.readChar());
        assertEquals('r', in.readChar());
        assertEquals('l', in.readChar());
        assertEquals('d', in.readChar());
        assertEquals('!', in.readChar());

        assertEquals(42.0, in.readDouble(), 0.0);
        assertEquals(42.0f, in.readFloat(), 0.0);
        assertEquals(42, in.readInt());
        assertEquals(42, in.readLong());
        assertEquals(42, in.readShort());
        assertEquals(49152, in.readUnsignedShort());

        assertEquals("Hello, World!", in.readUTF());
        assertEquals("The first line", in.readLine());
        assertEquals("", in.readLine());

        assertEquals(4, in.read(tmp));
        assertEquals(1, tmp[0]);
        assertEquals(2, tmp[1]);
        assertEquals(3, tmp[2]);
        assertEquals(4, tmp[3]);

        assertEquals(-1, in.read());
        assertEquals(-1, in.read(tmp));

        try {
            in.readByte();
            fail();
        } catch (EOFException e) {
            // Expected
        }

        try {
            in.readFully(tmp, 0, -1);
            fail();
        } catch (IndexOutOfBoundsException e) {
            // Expected
        }

        try {
            in.readFully(tmp);
            fail();
        } catch (EOFException e) {
            // Expected
        }

        in.close();

        assertEquals(buf.readerIndex(), in.readBytes());
    }

    @Test
    public void testReadLine() throws Exception {
        Charset utf8 = Charset.forName("UTF-8");
        ByteBuf buf = Unpooled.buffer();
        ByteBufInputStream in = new ByteBufInputStream(buf);

        String s = in.readLine();
        assertNull(s);

        int charCount = 5; //total chars in the string below without new line characters
        byte[] abc = "a\nb\r\nc\nd\ne".getBytes(utf8);
        buf.writeBytes(abc);
        in.mark(charCount);
        assertEquals("a", in.readLine());
        assertEquals("b", in.readLine());
        assertEquals("c", in.readLine());
        assertEquals("d", in.readLine());
        assertEquals("e", in.readLine());
        assertNull(in.readLine());

        in.reset();
        int count = 0;
        while (in.readLine() != null) {
            ++count;
            if (count > charCount) {
                fail("readLine() should have returned null");
            }
        }
        assertEquals(charCount, count);
        in.close();
    }
}

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