LazyFileOutputStream (Apache Ant API)
Date: 2018-03-24

org.apache.tools.ant.util

## Class LazyFileOutputStream

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

- All Implemented Interfaces:
    java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

      public class LazyFileOutputStream
      extends java.io.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 and Description
    `LazyFileOutputStream(java.io.File f)` Creates a stream that will eventually write to the file with the given name and replace it.
    `LazyFileOutputStream(java.io.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(java.io.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(java.lang.String name)` Creates a stream that will eventually write to the file with the given name and replace it.
    `LazyFileOutputStream(java.lang.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

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and 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`

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

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

- - ### Constructor Detail

    - #### LazyFileOutputStream

          public LazyFileOutputStream(java.lang.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(java.lang.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(java.io.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(java.io.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(java.io.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 Detail

    - #### open

          public void open()
                    throws java.io.IOException

      Explicitly open the file for writing.

      Returns silently if the file has already been opened.

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

    - #### close

          public void close()
                     throws java.io.IOException

      Close the file.
      Specified by:
        `close` in interface `java.io.Closeable`
      Specified by:
        `close` in interface `java.lang.AutoCloseable`
      Overrides:
        `close` in class `java.io.OutputStream`
      Throws:
        `java.io.IOException` - if there is an error.

    - #### write

          public void write(byte[] b)
                     throws java.io.IOException

      Delegates to the three-arg version.
      Overrides:
        `write` in class `java.io.OutputStream`
      Parameters:
        `b` - the bytearray to write.
      Throws:
        `java.io.IOException` - if there is a problem.

    - #### write

          public void write(byte[] b,
                            int offset,
                            int len)
                     throws java.io.IOException

      Write part of a byte array.
      Overrides:
        `write` in class `java.io.OutputStream`
      Parameters:
        `b` - the byte array.
        `offset` - write from this index.
        `len` - the number of bytes to write.
      Throws:
        `java.io.IOException` - if there is a problem.

    - #### write

          public void write(int b)
                     throws java.io.IOException

      Write a byte.
      Specified by:
        `write` in class `java.io.OutputStream`
      Parameters:
        `b` - the byte to write.
      Throws:
        `java.io.IOException` - if there is a problem.