WriteCharTest.java

/*
 * #%L
 * Common package for I/O and related utilities
 * %%
 * Copyright (C) 2005 - 2015 Open Microscopy Environment:
 *   - Board of Regents of the University of Wisconsin-Madison
 *   - Glencoe Software, Inc.
 *   - University of Dundee
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 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
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package loci.common.utests;

import static org.testng.AssertJUnit.assertEquals;

import java.io.IOException;

import loci.common.IRandomAccess;
import loci.common.utests.providers.IRandomAccessProvider;
import loci.common.utests.providers.IRandomAccessProviderFactory;

import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Optional;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;

/**
 * Tests for reading characters from a loci.common.IRandomAccess.
 *
 * @see loci.common.IRandomAccess
 */
@Test(groups="writeTests")
public class WriteCharTest {

  private static final byte[] PAGE = new byte[] {
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00
  };

  private static final String MODE = "rw";

  private static final int BUFFER_SIZE = 1024;

  private IRandomAccess fileHandle;

  private boolean checkGrowth;

  @Parameters({"provider", "checkGrowth"})
  @BeforeMethod
  public void setUp(String provider, @Optional("false") String checkGrowth)
    throws IOException {
    this.checkGrowth = Boolean.parseBoolean(checkGrowth);
    IRandomAccessProviderFactory factory = new IRandomAccessProviderFactory();
    IRandomAccessProvider instance = factory.getInstance(provider);
    fileHandle = instance.createMock(PAGE, MODE, BUFFER_SIZE);
  }

  @Test(groups="initialLengthTest")
  public void testLength() throws IOException {
    assertEquals(32, fileHandle.length());
  }

  @Test
  public void testSequential() throws IOException {
    fileHandle.seek(0);
    fileHandle.writeChar('a');
    if (checkGrowth) {
      assertEquals(2, fileHandle.length());
    }
    fileHandle.writeChar('b');
    if (checkGrowth) {
      assertEquals(4, fileHandle.length());
    }
    fileHandle.writeChar('c');
    if (checkGrowth) {
      assertEquals(6, fileHandle.length());
    }
    fileHandle.writeChar('d');
    if (checkGrowth) {
      assertEquals(8, fileHandle.length());
    }
    fileHandle.seek(0);
    assertEquals('a', fileHandle.readChar());
    assertEquals('b', fileHandle.readChar());
    assertEquals('c', fileHandle.readChar());
    assertEquals('d', fileHandle.readChar());
  }

  @Test
  public void testSeekForward() throws IOException {
    fileHandle.seek(8);
    fileHandle.writeChar('e');
    fileHandle.writeChar('f');
    if (checkGrowth) {
      assertEquals(12, fileHandle.length());
    }
    fileHandle.seek(8);
    assertEquals('e', fileHandle.readChar());
    assertEquals('f', fileHandle.readChar());
  }

  @Test
  public void testReset() throws IOException {
    fileHandle.seek(0);
    fileHandle.writeChar('a');
    if (checkGrowth) {
      assertEquals(2, fileHandle.length());
    }
    fileHandle.writeChar('b');
    if (checkGrowth) {
      assertEquals(4, fileHandle.length());
    }
    fileHandle.seek(0);
    assertEquals('a', fileHandle.readChar());
    assertEquals('b', fileHandle.readChar());
    fileHandle.seek(0);
    fileHandle.writeChar('c');
    fileHandle.writeChar('d');
    fileHandle.seek(0);
    assertEquals('c', fileHandle.readChar());
    assertEquals('d', fileHandle.readChar());
  }

}