# StreamCompressor (Apache Commons Compress 1.13 API)

org.apache.commons.compress.archivers.zip

## Class StreamCompressor

- java.lang.Object
- - org.apache.commons.compress.archivers.zip.StreamCompressor

- All Implemented Interfaces:
    Closeable, AutoCloseable

      public abstract class StreamCompressor
      extends Object
      implements Closeable

  Encapsulates a `Deflater` and crc calculator, handling multiple types of output streams. Currently `ZipEntry.DEFLATED` and `ZipEntry.STORED` are the only supported compression methods.
  Since:
    1.10

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close()`
    `static StreamCompressor` | `create(int compressionLevel, ScatterGatherBackingStore bs)` Create a stream compressor with the given compression level.
    `static StreamCompressor` | `create(ScatterGatherBackingStore bs)` Create a stream compressor with the default compression level.
    `void` | `deflate(InputStream source, int method)` Deflate the given source using the supplied compression method
    `long` | `getBytesRead()` Return the number of bytes read from the source stream
    `long` | `getBytesWrittenForLastEntry()` The number of bytes written to the output for the last entry
    `long` | `getCrc32()` The crc32 of the last deflated file
    `long` | `getTotalBytesWritten()` The total number of bytes written to the output for all files
    `void` | `writeCounted(byte[] data)`
    `void` | `writeCounted(byte[] data, int offset, int length)`
    `protected abstract void` | `writeOut(byte[] data, int offset, int length)`

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

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

- - ### Method Detail

    - #### create

          public static StreamCompressor create(int compressionLevel,
                                ScatterGatherBackingStore bs)

      Create a stream compressor with the given compression level.
      Parameters:
        `compressionLevel` - The `Deflater` compression level
        `bs` - The ScatterGatherBackingStore to receive output
      Returns:
        A stream compressor

    - #### create

          public static StreamCompressor create(ScatterGatherBackingStore bs)

      Create a stream compressor with the default compression level.
      Parameters:
        `bs` - The ScatterGatherBackingStore to receive output
      Returns:
        A stream compressor

    - #### getCrc32

          public long getCrc32()

      The crc32 of the last deflated file
      Returns:
        the crc32

    - #### getBytesRead

          public long getBytesRead()

      Return the number of bytes read from the source stream
      Returns:
        The number of bytes read, never negative

    - #### getBytesWrittenForLastEntry

          public long getBytesWrittenForLastEntry()

      The number of bytes written to the output for the last entry
      Returns:
        The number of bytes, never negative

    - #### getTotalBytesWritten

          public long getTotalBytesWritten()

      The total number of bytes written to the output for all files
      Returns:
        The number of bytes, never negative

    - #### deflate

          public void deflate(InputStream source,
                     int method)
                       throws IOException

      Deflate the given source using the supplied compression method
      Parameters:
        `source` - The source to compress
        `method` - The #ZipArchiveEntry compression method
      Throws:
        `IOException` - When failures happen

    - #### close

          public void close()
                     throws IOException

      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Throws:
        `IOException`

    - #### writeCounted

          public void writeCounted(byte[] data)
                            throws IOException

      Throws:
        `IOException`

    - #### writeCounted

          public void writeCounted(byte[] data,
                          int offset,
                          int length)
                            throws IOException

      Throws:
        `IOException`

    - #### writeOut

          protected abstract void writeOut(byte[] data,
                      int offset,
                      int length)
                                    throws IOException

      Throws:
        `IOException`

Copyright © 2016 The Apache Software Foundation. All rights reserved.