DMDirc-Util/test/com/dmdirc/util/io/ReverseFileReaderTest.java

/*
 * Copyright (c) 2006-2013 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.util.io;

import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.Stack;

import org.junit.Test;

import static org.junit.Assert.*;

public class ReverseFileReaderTest {

    @Test
    public void testIndividual() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        assertEquals("Line 7", reader.getNextLine());
        assertEquals("Line 6", reader.getNextLine());
        assertEquals("Line 5", reader.getNextLine());
        assertEquals("Line 4", reader.getNextLine());
        assertEquals("Line 3", reader.getNextLine());
        assertEquals("Line 2", reader.getNextLine());
        assertEquals("Line 1", reader.getNextLine());
        reader.close();
    }

    @Test
    public void testCarriageReturn() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test4.txt").toURI()));
        reader.getNextLine();
        assertEquals("Normal line", reader.getNextLine());
        reader.close();
    }

    @Test
    public void testLongLine() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test4.txt").toURI()));
        assertEquals("This is a line that is longer than 50 characters, so " +
                "should cause the reader to have to scan back multiple times.",
                reader.getNextLine());
        reader.close();
    }

    @Test
    public void testStack() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        final Stack<String> lines = reader.getLines(10);

        assertEquals(7, lines.size());
        assertEquals("Line 1", lines.pop());
        assertEquals("Line 2", lines.pop());
        assertEquals("Line 3", lines.pop());
        assertEquals("Line 4", lines.pop());
        assertEquals("Line 5", lines.pop());
        assertEquals("Line 6", lines.pop());
        assertEquals("Line 7", lines.pop());
        reader.close();
    }

    @Test
    public void testSmallStack() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        final Stack<String> lines = reader.getLines(3);

        assertEquals(3, lines.size());
        assertEquals("Line 5", lines.pop());
        assertEquals("Line 6", lines.pop());
        assertEquals("Line 7", lines.pop());
        reader.close();
    }

    @Test
    public void testReset() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        assertEquals("Line 7", reader.getNextLine());
        assertEquals("Line 6", reader.getNextLine());
        reader.reset();
        assertEquals("Line 7", reader.getNextLine());
        assertEquals("Line 6", reader.getNextLine());
        assertEquals("Line 5", reader.getNextLine());
        reader.close();
    }

    @Test(expected=IOException.class)
    public void testIllegalClose() throws URISyntaxException, IOException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        reader.close();
        reader.close();
    }

    @Test(expected=IOException.class)
    public void testIllegalReset() throws URISyntaxException, IOException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        reader.close();
        reader.reset();
    }

    @Test(expected=IOException.class)
    public void testIllegalGetNextLine() throws URISyntaxException, IOException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        reader.close();
        reader.getNextLine();
    }

    @Test
    public void testSeekLength() throws IOException, URISyntaxException {
        final ReverseFileReader reader = new ReverseFileReader(
                new File(getClass().getResource("test1.txt").toURI()));
        reader.setSeekLength((byte) 100);
        assertEquals((byte) 100, reader.getSeekLength());
    }

}