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## com.google.common.io
Class FileBackedOutputStream

    java.lang.Object
      java.io.OutputStream
          com.google.common.io.FileBackedOutputStream

All Implemented Interfaces:
  Closeable, Flushable

    @Beta
    public final class FileBackedOutputStream

extends OutputStream

An `OutputStream` that starts buffering to a byte array, but switches to file buffering once the data reaches a configurable size.

This class is thread-safe.

Since:
  1.0
Author:
  Chris Nokleberg

Constructor Summary
`FileBackedOutputStream(int fileThreshold)` Creates a new instance that uses the given file threshold, and does not reset the data when the `InputSupplier` returned by `getSupplier()` is finalized.
`FileBackedOutputStream(int fileThreshold, boolean resetOnFinalize)` Creates a new instance that uses the given file threshold, and optionally resets the data when the `InputSupplier` returned by `getSupplier()` is finalized.

Method Summary
`void` | `close()`
`void` | `flush()`
`InputSupplier<InputStream>` | `getSupplier()` Returns a supplier that may be used to retrieve the data buffered by this stream.
`void` | `reset()` Calls `close()` if not already closed, and then resets this object back to its initial state, for reuse.
`void` | `write(byte[] b)`
`void` | `write(byte[] b, int off, int len)`
`void` | `write(int b)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### FileBackedOutputStream

    public FileBackedOutputStream(int fileThreshold)

  Creates a new instance that uses the given file threshold, and does not reset the data when the `InputSupplier` returned by `getSupplier()` is finalized.

  Parameters:
    `fileThreshold` - the number of bytes before the stream should switch to buffering to a file

### FileBackedOutputStream

    public FileBackedOutputStream(int fileThreshold,
                                  boolean resetOnFinalize)

  Creates a new instance that uses the given file threshold, and optionally resets the data when the `InputSupplier` returned by `getSupplier()` is finalized.

  Parameters:
    `fileThreshold` - the number of bytes before the stream should switch to buffering to a file
    `resetOnFinalize` - if true, the `reset()` method will be called when the `InputSupplier` returned by `getSupplier()` is finalized

Method Detail

### getSupplier

    public InputSupplier<InputStream> getSupplier()

  Returns a supplier that may be used to retrieve the data buffered by this stream.

### reset

    public void reset()
               throws IOException

  Calls `close()` if not already closed, and then resets this object back to its initial state, for reuse. If data was buffered to a file, it will be deleted.

  Throws:
    `IOException` - if an I/O error occurred while deleting the file buffer

### write

    public void write(int b)
               throws IOException

  Specified by:
    `write` in class `OutputStream`
  Throws:
    `IOException`

### write

    public void write(byte[] b)
               throws IOException

  Overrides:
    `write` in class `OutputStream`
  Throws:
    `IOException`

### write

    public void write(byte[] b,
                      int off,
                      int len)
               throws IOException

  Overrides:
    `write` in class `OutputStream`
  Throws:
    `IOException`

### close

    public void close()
               throws IOException

  Specified by:
    `close` in interface `Closeable`
  Overrides:
    `close` in class `OutputStream`
  Throws:
    `IOException`

### flush

    public void flush()
               throws IOException

  Specified by:
    `flush` in interface `Flushable`
  Overrides:
    `flush` in class `OutputStream`
  Throws:
    `IOException`

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