本文整理了Java中org.agrona.IoUtil.checkFileExists()方法的一些代码示例，展示了IoUtil.checkFileExists()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。IoUtil.checkFileExists()方法的具体详情如下：
包路径：org.agrona.IoUtil
类名称：IoUtil
方法名：checkFileExists

IoUtil.checkFileExists介绍

[英]Check that a file exists and throw an exception if not.
[中]检查文件是否存在，如果不存在，则引发异常。

代码示例

代码示例来源：origin: real-logic/agrona

/**
 * Check that file exists, open file, and return MappedByteBuffer for entire file
 * <p>
 * The file itself will be closed, but the mapping will persist.
 *
 * @param location         of the file to map
 * @param descriptionLabel to be associated for any exceptions
 * @return {@link java.nio.MappedByteBuffer} for the file
 */
public static MappedByteBuffer mapExistingFile(final File location, final String descriptionLabel)
{
  checkFileExists(location, descriptionLabel);
  MappedByteBuffer mappedByteBuffer = null;
  try (RandomAccessFile file = new RandomAccessFile(location, "rw");
    FileChannel channel = file.getChannel())
  {
    mappedByteBuffer = channel.map(READ_WRITE, 0, channel.size());
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
  return mappedByteBuffer;
}

代码示例来源：origin: real-logic/agrona

/**
 * Check that file exists, open file, and return MappedByteBuffer for only region specified
 * <p>
 * The file itself will be closed, but the mapping will persist.
 *
 * @param location         of the file to map
 * @param descriptionLabel to be associated for an exceptions
 * @param offset           offset to start mapping at
 * @param length           length to map region
 * @return {@link java.nio.MappedByteBuffer} for the file
 */
public static MappedByteBuffer mapExistingFile(
  final File location, final String descriptionLabel, final long offset, final long length)
{
  checkFileExists(location, descriptionLabel);
  MappedByteBuffer mappedByteBuffer = null;
  try (RandomAccessFile file = new RandomAccessFile(location, "rw");
    FileChannel channel = file.getChannel())
  {
    mappedByteBuffer = channel.map(READ_WRITE, offset, length);
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
  return mappedByteBuffer;
}

代码示例来源：origin: real-logic/artio

private void openFile(final File file)
{
  checkFileExists(file, file.getName());
  try
  {
    final RandomAccessFile randomAccessFile = new RandomAccessFile(file, "r");
    channel = randomAccessFile.getChannel();
    map(channel.size());
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
}

代码示例来源：origin: org.agrona/agrona

/**
 * Check that file exists, open file, and return MappedByteBuffer for only region specified
 * <p>
 * The file itself will be closed, but the mapping will persist.
 *
 * @param location         of the file to map
 * @param descriptionLabel to be associated for an exceptions
 * @param offset           offset to start mapping at
 * @param length           length to map region
 * @return {@link java.nio.MappedByteBuffer} for the file
 */
public static MappedByteBuffer mapExistingFile(
  final File location, final String descriptionLabel, final long offset, final long length)
{
  checkFileExists(location, descriptionLabel);
  MappedByteBuffer mappedByteBuffer = null;
  try (RandomAccessFile file = new RandomAccessFile(location, "rw");
    FileChannel channel = file.getChannel())
  {
    mappedByteBuffer = channel.map(READ_WRITE, offset, length);
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
  return mappedByteBuffer;
}

代码示例来源：origin: org.agrona/agrona

/**
 * Check that file exists, open file, and return MappedByteBuffer for entire file
 * <p>
 * The file itself will be closed, but the mapping will persist.
 *
 * @param location         of the file to map
 * @param descriptionLabel to be associated for any exceptions
 * @return {@link java.nio.MappedByteBuffer} for the file
 */
public static MappedByteBuffer mapExistingFile(final File location, final String descriptionLabel)
{
  checkFileExists(location, descriptionLabel);
  MappedByteBuffer mappedByteBuffer = null;
  try (RandomAccessFile file = new RandomAccessFile(location, "rw");
    FileChannel channel = file.getChannel())
  {
    mappedByteBuffer = channel.map(READ_WRITE, 0, channel.size());
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
  return mappedByteBuffer;
}

代码示例来源：origin: org.agrona/Agrona

/**
 * Check that file exists, open file, and return MappedByteBuffer for entire file
 * <p>
 * The file itself will be closed, but the mapping will persist.
 *
 * @param location         of the file to map
 * @param descriptionLabel to be associated for any exceptions
 * @return {@link java.nio.MappedByteBuffer} for the file
 */
public static MappedByteBuffer mapExistingFile(final File location, final String descriptionLabel)
{
  checkFileExists(location, descriptionLabel);
  MappedByteBuffer mappedByteBuffer = null;
  try (RandomAccessFile file = new RandomAccessFile(location, "rw");
     FileChannel channel = file.getChannel())
  {
    mappedByteBuffer = channel.map(READ_WRITE, 0, channel.size());
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
  return mappedByteBuffer;
}

代码示例来源：origin: org.agrona/Agrona

/**
 * Check that file exists, open file, and return MappedByteBuffer for only region specified
 * <p>
 * The file itself will be closed, but the mapping will persist.
 *
 * @param location         of the file to map
 * @param descriptionLabel to be associated for an exceptions
 * @param offset           offset to start mapping at
 * @param size             length to map region
 * @return {@link java.nio.MappedByteBuffer} for the file
 */
public static MappedByteBuffer mapExistingFile(
  final File location, final String descriptionLabel, final long offset, final long size)
{
  checkFileExists(location, descriptionLabel);
  MappedByteBuffer mappedByteBuffer = null;
  try (RandomAccessFile file = new RandomAccessFile(location, "rw");
     FileChannel channel = file.getChannel())
  {
    mappedByteBuffer = channel.map(READ_WRITE, offset, size);
  }
  catch (final IOException ex)
  {
    LangUtil.rethrowUnchecked(ex);
  }
  return mappedByteBuffer;
}