Package org.apache.tools.ant.util

# Class LazyFileOutputStream

java.lang.Object
java.io.OutputStream
org.apache.tools.ant.util.LazyFileOutputStream

All Implemented Interfaces:
  `Closeable`, `Flushable`, `AutoCloseable`

public class LazyFileOutputStream extends OutputStream
Class that delays opening the output file until the first bytes shall be written or the method `open` has been invoked explicitly.

Since:
  Ant 1.6

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `LazyFileOutputStream(File f)`
  Creates a stream that will eventually write to the file with the given name and replace it.
  `LazyFileOutputStream(File file, boolean append)`
  Creates a stream that will eventually write to the file with the given name and optionally append to instead of replacing it.
  `LazyFileOutputStream(File file, boolean append, boolean alwaysCreate)`
  Creates a stream that will eventually write to the file with the given name, optionally append to instead of replacing it, and optionally always create a file (even if zero length).
  `LazyFileOutputStream(String name)`
  Creates a stream that will eventually write to the file with the given name and replace it.
  `LazyFileOutputStream(String name, boolean append)`
  Creates a stream that will eventually write to the file with the given name and optionally append to instead of replacing it.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `close()`
  Close the file.
  `void`
  `open()`
  Explicitly open the file for writing.
  `void`
  `write(byte[] b)`
  Delegates to the three-arg version.
  `void`
  `write(byte[] b, int offset, int len)`
  Write part of a byte array.
  `void`
  `write(int b)`
  Write a byte.

  ### Methods inherited from class java.io.OutputStream

  `flush, nullOutputStream`

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

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

- ## Constructor Details

  - ### LazyFileOutputStream

    public LazyFileOutputStream(String name)
    Creates a stream that will eventually write to the file with the given name and replace it.
    Parameters:
      `name` - the filename.

  - ### LazyFileOutputStream

    public LazyFileOutputStream(String name, boolean append)
    Creates a stream that will eventually write to the file with the given name and optionally append to instead of replacing it.
    Parameters:
      `name` - the filename.
      `append` - if true append rather than replace.

  - ### LazyFileOutputStream

    public LazyFileOutputStream(File f)
    Creates a stream that will eventually write to the file with the given name and replace it.
    Parameters:
      `f` - the file to create.

  - ### LazyFileOutputStream

    public LazyFileOutputStream(File file, boolean append)
    Creates a stream that will eventually write to the file with the given name and optionally append to instead of replacing it.
    Parameters:
      `file` - the file to create.
      `append` - if true append rather than replace.

  - ### LazyFileOutputStream

    public LazyFileOutputStream(File file, boolean append, boolean alwaysCreate)
    Creates a stream that will eventually write to the file with the given name, optionally append to instead of replacing it, and optionally always create a file (even if zero length).
    Parameters:
      `file` - the file to create.
      `append` - if true append rather than replace.
      `alwaysCreate` - if true create the file even if nothing to write.

- ## Method Details

  - ### open

    public void open() throws IOException
    Explicitly open the file for writing.

    Returns silently if the file has already been opened.

    Throws:
      `IOException` - if there is an error.

  - ### close

    public void close() throws IOException
    Close the file.
    Specified by:
      `close` in interface `AutoCloseable`
    Specified by:
      `close` in interface `Closeable`
    Overrides:
      `close` in class `OutputStream`
    Throws:
      `IOException` - if there is an error.

  - ### write

    public void write(byte[] b) throws IOException
    Delegates to the three-arg version.
    Overrides:
      `write` in class `OutputStream`
    Parameters:
      `b` - the bytearray to write.
    Throws:
      `IOException` - if there is a problem.

  - ### write

    public void write(byte[] b, int offset, int len) throws IOException
    Write part of a byte array.
    Overrides:
      `write` in class `OutputStream`
    Parameters:
      `b` - the byte array.
      `offset` - write from this index.
      `len` - the number of bytes to write.
    Throws:
      `IOException` - if there is a problem.

  - ### write

    public void write(int b) throws IOException
    Write a byte.
    Specified by:
      `write` in class `OutputStream`
    Parameters:
      `b` - the byte to write.
    Throws:
      `IOException` - if there is a problem.