Package org.apache.commons.compress.archivers

# Class ArchiveOutputStream

java.lang.Object
java.io.OutputStream
org.apache.commons.compress.archivers.ArchiveOutputStream

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

Direct Known Subclasses:
  `ArArchiveOutputStream`, `CpioArchiveOutputStream`, `TarArchiveOutputStream`, `ZipArchiveOutputStream`

public abstract class ArchiveOutputStream extends OutputStream
Archive output stream implementations are expected to override the `OutputStream.write(byte[], int, int)` method to improve performance. They should also override `OutputStream.close()` to ensure that any necessary trailers are added.

The normal sequence of calls when working with ArchiveOutputStreams is:

- Create ArchiveOutputStream object,
- optionally write SFX header (Zip only),
- repeat as needed:
  - `putArchiveEntry(ArchiveEntry)` (writes entry header),
  - `OutputStream.write(byte[])` (writes entry data, as often as needed),
  - `closeArchiveEntry()` (closes entry),
- `finish()` (ends the addition of entries),
- optionally write additional data, provided format supports it,
- `OutputStream.close()`.

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `ArchiveOutputStream()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `canWriteEntryData(ArchiveEntry archiveEntry)`
  Whether this stream is able to write the given entry.
  `abstract void`
  `closeArchiveEntry()`
  Closes the archive entry, writing any trailer information that may be required.
  `protected void`
  `count(int written)`
  Increments the counter of already written bytes.
  `protected void`
  `count(long written)`
  Increments the counter of already written bytes.
  `abstract ArchiveEntry`
  `createArchiveEntry(File inputFile, String entryName)`
  Create an archive entry using the inputFile and entryName provided.
  `ArchiveEntry`
  `createArchiveEntry(Path inputPath, String entryName, LinkOption... options)`
  Create an archive entry using the inputPath and entryName provided.
  `abstract void`
  `finish()`
  Finishes the addition of entries to this stream, without closing it.
  `long`
  `getBytesWritten()`
  Returns the current number of bytes written to this stream.
  `int`
  `getCount()`
  Deprecated.
  this method may yield wrong results for large archives, use #getBytesWritten instead
  `abstract void`
  `putArchiveEntry(ArchiveEntry entry)`
  Writes the headers for an archive entry to the output stream.
  `void`
  `write(int b)`
  Writes a byte to the current archive entry.

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

  `close, flush, write, write`

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

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

- ## Constructor Details

  - ### ArchiveOutputStream

    public ArchiveOutputStream()

- ## Method Details

  - ### canWriteEntryData

    public boolean canWriteEntryData(ArchiveEntry archiveEntry)
    Whether this stream is able to write the given entry.

    Some archive formats support variants or details that are not supported (yet).

    Parameters:
      `archiveEntry` - the entry to test
    Returns:
      This implementation always returns true.
    Since:
      1.1

  - ### closeArchiveEntry

    public abstract void closeArchiveEntry() throws IOException
    Closes the archive entry, writing any trailer information that may be required.
    Throws:
      `IOException` - if an I/O error occurs

  - ### count

    protected void count(int written)
    Increments the counter of already written bytes. Doesn't increment if EOF has been hit (`written == -1`).
    Parameters:
      `written` - the number of bytes written

  - ### count

    protected void count(long written)
    Increments the counter of already written bytes. Doesn't increment if EOF has been hit (`written == -1`).
    Parameters:
      `written` - the number of bytes written
    Since:
      1.1

  - ### createArchiveEntry

    public abstract ArchiveEntry createArchiveEntry(File inputFile, String entryName) throws IOException
    Create an archive entry using the inputFile and entryName provided.
    Parameters:
      `inputFile` - the file to create the entry from
      `entryName` - name to use for the entry
    Returns:
      the ArchiveEntry set up with details from the file
    Throws:
      `IOException` - if an I/O error occurs

  - ### createArchiveEntry

    public ArchiveEntry createArchiveEntry(Path inputPath, String entryName, LinkOption... options) throws IOException
    Create an archive entry using the inputPath and entryName provided. The default implementation calls simply delegates as:

        return createArchiveEntry(inputFile.toFile(), entryName);

    Subclasses should override this method.
    Parameters:
      `inputPath` - the file to create the entry from
      `entryName` - name to use for the entry
      `options` - options indicating how symbolic links are handled.
    Returns:
      the ArchiveEntry set up with details from the file
    Throws:
      `IOException` - if an I/O error occurs
    Since:
      1.21

  - ### finish

    public abstract void finish() throws IOException
    Finishes the addition of entries to this stream, without closing it. Additional data can be written, if the format supports it.
    Throws:
      `IOException` - if the user forgets to close the entry.

  - ### getBytesWritten

    public long getBytesWritten()
    Returns the current number of bytes written to this stream.
    Returns:
      the number of written bytes
    Since:
      1.1

  - ### getCount

    @Deprecated public int getCount()
    Deprecated.
    this method may yield wrong results for large archives, use #getBytesWritten instead
    Returns the current number of bytes written to this stream.
    Returns:
      the number of written bytes

  - ### putArchiveEntry

    public abstract void putArchiveEntry(ArchiveEntry entry) throws IOException
    Writes the headers for an archive entry to the output stream. The caller must then write the content to the stream and call `closeArchiveEntry()` to complete the process.
    Parameters:
      `entry` - describes the entry
    Throws:
      `IOException` - if an I/O error occurs

  - ### write

    public void write(int b) throws IOException
    Writes a byte to the current archive entry.

    This method simply calls `write( byte[], 0, 1 )`.

    MUST be overridden if the `OutputStream.write(byte[], int, int)` method is not overridden; may be overridden otherwise.

    Specified by:
      `write` in class `OutputStream`
    Parameters:
      `b` - The byte to be written.
    Throws:
      `IOException` - on error