How to use

isInMemory

method

in

org.apache.tomcat.util.http.fileupload.disk.DiskFileItem

/**
 * Deletes the underlying storage for a file item, including deleting any
 * associated temporary disk file. Although this storage will be deleted
 * automatically when the <code>FileItem</code> instance is garbage
 * collected, this method can be used to ensure that this is done at an
 * earlier time, thus preserving system resources.
 */
@Override
public void delete() {
  cachedContent = null;
  File outputFile = getStoreLocation();
  if (outputFile != null && !isInMemory() && outputFile.exists()) {
    outputFile.delete();
  }
}

/**
 * Returns the {@link java.io.File} object for the <code>FileItem</code>'s
 * data's temporary location on the disk. Note that for
 * <code>FileItem</code>s that have their data stored in memory,
 * this method will return <code>null</code>. When handling large
 * files, you can use {@link java.io.File#renameTo(java.io.File)} to
 * move the file to new location without copying the data, if the
 * source and destination locations reside within the same logical
 * volume.
 *
 * @return The data file, or <code>null</code> if the data is stored in
 *         memory.
 */
public File getStoreLocation() {
  if (dfos == null) {
    return null;
  }
  if (isInMemory()) {
    return null;
  }
  return dfos.getFile();
}

/**
 * Returns an {@link java.io.InputStream InputStream} that can be
 * used to retrieve the contents of the file.
 *
 * @return An {@link java.io.InputStream InputStream} that can be
 *         used to retrieve the contents of the file.
 *
 * @throws IOException if an error occurs.
 */
public InputStream getInputStream()
  throws IOException {
  if (!isInMemory()) {
    return new FileInputStream(dfos.getFile());
  }
  if (cachedContent == null) {
    cachedContent = dfos.getData();
  }
  return new ByteArrayInputStream(cachedContent);
}

/**
 * Returns an {@link java.io.InputStream InputStream} that can be
 * used to retrieve the contents of the file.
 *
 * @return An {@link java.io.InputStream InputStream} that can be
 *         used to retrieve the contents of the file.
 *
 * @throws IOException if an error occurs.
 */
public InputStream getInputStream()
  throws IOException {
  if (!isInMemory()) {
    return new FileInputStream(dfos.getFile());
  }
  if (cachedContent == null) {
    cachedContent = dfos.getData();
  }
  return new ByteArrayInputStream(cachedContent);
}

/**
 * Returns an {@link java.io.InputStream InputStream} that can be
 * used to retrieve the contents of the file.
 *
 * @return An {@link java.io.InputStream InputStream} that can be
 *         used to retrieve the contents of the file.
 *
 * @throws IOException if an error occurs.
 */
@Override
public InputStream getInputStream()
  throws IOException {
  if (!isInMemory()) {
    return new FileInputStream(dfos.getFile());
  }
  if (cachedContent == null) {
    cachedContent = dfos.getData();
  }
  return new ByteArrayInputStream(cachedContent);
}

/**
 * Returns an {@link java.io.InputStream InputStream} that can be
 * used to retrieve the contents of the file.
 *
 * @return An {@link java.io.InputStream InputStream} that can be
 *         used to retrieve the contents of the file.
 *
 * @throws IOException if an error occurs.
 */
@Override
public InputStream getInputStream()
  throws IOException {
  if (!isInMemory()) {
    return new FileInputStream(dfos.getFile());
  }
  if (cachedContent == null) {
    cachedContent = dfos.getData();
  }
  return new ByteArrayInputStream(cachedContent);
}

/**
 * Returns an {@link java.io.InputStream InputStream} that can be
 * used to retrieve the contents of the file.
 *
 * @return An {@link java.io.InputStream InputStream} that can be
 *         used to retrieve the contents of the file.
 *
 * @throws IOException if an error occurs.
 */
@Override
public InputStream getInputStream()
  throws IOException {
  if (!isInMemory()) {
    return new FileInputStream(dfos.getFile());
  }
  if (cachedContent == null) {
    cachedContent = dfos.getData();
  }
  return new ByteArrayInputStream(cachedContent);
}

/**
 * Returns an {@link java.io.InputStream InputStream} that can be
 * used to retrieve the contents of the file.
 *
 * @return An {@link java.io.InputStream InputStream} that can be
 *         used to retrieve the contents of the file.
 *
 * @throws IOException if an error occurs.
 */
@Override
public InputStream getInputStream()
  throws IOException {
  if (!isInMemory()) {
    return new FileInputStream(dfos.getFile());
  }
  if (cachedContent == null) {
    cachedContent = dfos.getData();
  }
  return new ByteArrayInputStream(cachedContent);
}

if (isInMemory()) {
  if (cachedContent == null) {
    cachedContent = dfos.getData();

if (isInMemory()) {
  if (cachedContent == null) {
    cachedContent = dfos.getData();

if (isInMemory()) {
  if (cachedContent == null) {
    cachedContent = dfos.getData();

if (isInMemory()) {
  if (cachedContent == null) {
    cachedContent = dfos.getData();

if (isInMemory()) {
  if (cachedContent == null) {
    cachedContent = dfos.getData();

if (isInMemory()) {
  FileOutputStream fout = null;
  try {

if (isInMemory()) {
  FileOutputStream fout = null;
  try {

if (isInMemory()) {
  FileOutputStream fout = null;
  try {

if (isInMemory()) {
  FileOutputStream fout = null;
  try {

if (isInMemory()) {
  FileOutputStream fout = null;
  try {

if (isInMemory()) {
  FileOutputStream fout = null;
  try {

/**
 * Returns the contents of the file as an array of bytes.  If the
 * contents of the file were not yet cached in memory, they will be
 * loaded from the disk storage and cached.
 *
 * @return The contents of the file as an array of bytes
 * or {@code null} if the data cannot be read
 */
@Override
public byte[] get() {
  if (isInMemory()) {
    if (cachedContent == null && dfos != null) {
      cachedContent = dfos.getData();
    }
    return cachedContent;
  }
  byte[] fileData = new byte[(int) getSize()];
  InputStream fis = null;
  try {
    fis = new FileInputStream(dfos.getFile());
    IOUtils.readFully(fis, fileData);
  } catch (IOException e) {
    fileData = null;
  } finally {
    IOUtils.closeQuietly(fis);
  }
  return fileData;
}