Package org.apache.commons.io.input

# Class AutoCloseInputStream

java.lang.Object
java.io.InputStream
java.io.FilterInputStream
org.apache.commons.io.input.ProxyInputStream
org.apache.commons.io.input.AutoCloseInputStream

All Implemented Interfaces:
  `Closeable`, `AutoCloseable`

public class AutoCloseInputStream extends ProxyInputStream
Proxy stream that closes and discards the underlying stream as soon as the end of input has been reached or when the stream is explicitly closed. Not even a reference to the underlying stream is kept after it has been closed, so any allocated in-memory buffers can be freed even if the client application still keeps a reference to the proxy stream.

This class is typically used to release any resources related to an open stream as soon as possible even if the client application (by not explicitly closing the stream when no longer needed) or the underlying stream (by not releasing resources once the last byte has been read) do not do that.

To build an instance, use `AutoCloseInputStream.Builder`.

Since:
  1.4
See Also:
  - `AutoCloseInputStream.Builder`

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static class`
  `AutoCloseInputStream.Builder`
  Builds a new `AutoCloseInputStream` instance.

- ## Field Summary

  ### Fields inherited from class java.io.FilterInputStream

  `in`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `AutoCloseInputStream(InputStream in)`
  Deprecated.
  Use `builder()`, `AutoCloseInputStream.Builder`, and `AutoCloseInputStream.Builder.get()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected void`
  `afterRead(int n)`
  Automatically closes the stream if the end of stream was reached.
  `static AutoCloseInputStream.Builder`
  `builder()`
  Constructs a new `AutoCloseInputStream.Builder`.
  `void`
  `close()`
  Closes the underlying input stream and replaces the reference to it with a `ClosedInputStream` instance.
  `protected void`
  `finalize()`
  Ensures that the stream is closed before it gets garbage-collected.

  ### Methods inherited from class org.apache.commons.io.input.ProxyInputStream

  `available, beforeRead, handleIOException, mark, markSupported, read, read, read, reset, skip, unwrap`

  ### Methods inherited from class java.lang.Object

  `clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### AutoCloseInputStream

    @Deprecated public AutoCloseInputStream(InputStream in)
    Deprecated.
    Use `builder()`, `AutoCloseInputStream.Builder`, and `AutoCloseInputStream.Builder.get()`
    Constructs an automatically closing proxy for the given input stream.
    Parameters:
      `in` - underlying input stream

- ## Method Details

  - ### builder

    public static AutoCloseInputStream.Builder builder()
    Constructs a new `AutoCloseInputStream.Builder`.
    Returns:
      a new `AutoCloseInputStream.Builder`.
    Since:
      2.12.0

  - ### afterRead

    protected void afterRead(int n) throws IOException
    Automatically closes the stream if the end of stream was reached.
    Overrides:
      `afterRead` in class `ProxyInputStream`
    Parameters:
      `n` - number of bytes read, or -1 if no more bytes are available
    Throws:
      `IOException` - if the stream could not be closed
    Since:
      2.0

  - ### close

    public void close() throws IOException
    Closes the underlying input stream and replaces the reference to it with a `ClosedInputStream` instance.

    This method is automatically called by the read methods when the end of input has been reached.

    Note that it is safe to call this method any number of times. The original underlying input stream is closed and discarded only once when this method is first called.

    Specified by:
      `close` in interface `AutoCloseable`
    Specified by:
      `close` in interface `Closeable`
    Overrides:
      `close` in class `ProxyInputStream`
    Throws:
      `IOException` - if the underlying input stream can not be closed

  - ### finalize

    protected void finalize() throws Throwable
    Ensures that the stream is closed before it gets garbage-collected. As mentioned in `close()`, this is a no-op if the stream has already been closed.
    Overrides:
      `finalize` in class `Object`
    Throws:
      `Throwable` - if an error occurs