ReadLongTest.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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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.Parameters;
import org.testng.annotations.Test;

/**
 * Tests for reading longs from a loci.common.IRandomAccess.
 *
 * @see loci.common.IRandomAccess
 */
@Test(groups="readTests")
public class ReadLongTest {

  private static final byte[] PAGE = new byte[] {
    // 64-bit long
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01,
    // 64-bit long
    (byte) 0x0F, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
    (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0x02,
    // 64-bit long
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x03,
    // 64-bit long
    (byte) 0x0F, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
    (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0x04,
    // 64-bit long
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x05,
    // 64-bit long (-1)
    (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
    (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
    // 64-bit long
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
    (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x07,
    // 64-bit long (-2)
    (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF,
    (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFE
  };

  private static final String MODE = "r";

  private static final int BUFFER_SIZE = 1024;

  private IRandomAccess fileHandle;

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

  @Test
  public void testLength() throws IOException {
    assertEquals(64, fileHandle.length());
  }

  @Test
  public void testSequentialReadLong() throws IOException {
    assertEquals(1, fileHandle.readLong());
    assertEquals(1152921504606846722L, fileHandle.readLong());
    assertEquals(3, fileHandle.readLong());
    assertEquals(1152921504606846724L, fileHandle.readLong());
    assertEquals(5, fileHandle.readLong());
    assertEquals(-1L, fileHandle.readLong());
    assertEquals(7, fileHandle.readLong());
    assertEquals(-2L, fileHandle.readLong());
  }

  @Test
  public void testSeekForwardReadLong() throws IOException {
    fileHandle.seek(8);
    assertEquals(1152921504606846722L, fileHandle.readLong());
    assertEquals(3, fileHandle.readLong());
  }

  @Test
  public void testResetReadLong() throws IOException {
    assertEquals(1, fileHandle.readLong());
    assertEquals(1152921504606846722L, fileHandle.readLong());
    fileHandle.seek(0);
    assertEquals(1, fileHandle.readLong());
    assertEquals(1152921504606846722L, fileHandle.readLong());
  }

  @Test
  public void testSeekBackReadLong() throws IOException {
    fileHandle.seek(16);
    fileHandle.seek(8);
    assertEquals(1152921504606846722L, fileHandle.readLong());
    assertEquals(3, fileHandle.readLong());
  }

  @Test
  public void testRandomAccessReadLong() throws IOException {
    testSeekForwardReadLong();
    testSeekBackReadLong();
    // The test relies on a "new" file or reset file pointer
    fileHandle.seek(0);
    testResetReadLong();
  }

}