org.apache.commons.compress.archivers.zip

## Class ZipSplitReadOnlySeekableByteChannel

- java.lang.Object
- - org.apache.commons.compress.utils.MultiReadOnlySeekableByteChannel
  - - org.apache.commons.compress.archivers.zip.ZipSplitReadOnlySeekableByteChannel

- All Implemented Interfaces:
    Closeable, AutoCloseable, ByteChannel, Channel, ReadableByteChannel, SeekableByteChannel, WritableByteChannel

      public class ZipSplitReadOnlySeekableByteChannel
      extends MultiReadOnlySeekableByteChannel

  `MultiReadOnlySeekableByteChannel` that knows what a split ZIP archive should look like.

  If you want to read a split archive using `ZipFile` then create an instance of this class from the parts of the archive.

  Since:
    1.20

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ZipSplitReadOnlySeekableByteChannel(List<SeekableByteChannel> channels)` Concatenates the given channels.

  - ### Method Summary

    All Methods Static Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `static SeekableByteChannel` | `buildFromLastSplitSegment(File lastSegmentFile)` Concatenates zip split files from the last segment(the extension SHOULD be .zip)
    `static SeekableByteChannel` | `forFiles(File... files)` Concatenates the given files.
    `static SeekableByteChannel` | `forFiles(File lastSegmentFile, Iterable<File> files)` Concatenates the given files.
    `static SeekableByteChannel` | `forOrderedSeekableByteChannels(SeekableByteChannel... channels)` Concatenates the given channels.
    `static SeekableByteChannel` | `forOrderedSeekableByteChannels(SeekableByteChannel lastSegmentChannel, Iterable<SeekableByteChannel> channels)` Concatenates the given channels.

    - ### Methods inherited from class org.apache.commons.compress.utils.MultiReadOnlySeekableByteChannel

      `close, forSeekableByteChannels, isOpen, position, position, position, read, size, truncate, write`

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

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

- - ### Constructor Detail

    - #### ZipSplitReadOnlySeekableByteChannel

          public ZipSplitReadOnlySeekableByteChannel(List<SeekableByteChannel> channels)
                                              throws IOException

      Concatenates the given channels.

      The channels should be add in ascending order, e.g. z01, z02, ... z99, zip please note that the .zip file is the last segment and should be added as the last one in the channels

      Parameters:
        `channels` - the channels to concatenate
      Throws:
        `NullPointerException` - if channels is null
        `IOException` - if the first channel doesn't seem to hold the beginning of a split archive

  - ### Method Detail

    - #### forOrderedSeekableByteChannels

          public static SeekableByteChannel forOrderedSeekableByteChannels(SeekableByteChannel... channels)
                                                                    throws IOException

      Concatenates the given channels.
      Parameters:
        `channels` - the channels to concatenate, note that the LAST CHANNEL of channels should be the LAST SEGMENT(.zip) and theses channels should be added in correct order (e.g. .z01, .z02... .z99, .zip)
      Returns:
        SeekableByteChannel that concatenates all provided channels
      Throws:
        `NullPointerException` - if channels is null
        `IOException` - if reading channels fails

    - #### forOrderedSeekableByteChannels

          public static SeekableByteChannel forOrderedSeekableByteChannels(SeekableByteChannel lastSegmentChannel,
                                                                           Iterable<SeekableByteChannel> channels)
                                                                    throws IOException

      Concatenates the given channels.
      Parameters:
        `lastSegmentChannel` - channel of the last segment of split zip segments, its extension should be .zip
        `channels` - the channels to concatenate except for the last segment, note theses channels should be added in correct order (e.g. .z01, .z02... .z99)
      Returns:
        SeekableByteChannel that concatenates all provided channels
      Throws:
        `NullPointerException` - if lastSegmentChannel or channels is null
        `IOException` - if the first channel doesn't seem to hold the beginning of a split archive

    - #### buildFromLastSplitSegment

          public static SeekableByteChannel buildFromLastSplitSegment(File lastSegmentFile)
                                                               throws IOException

      Concatenates zip split files from the last segment(the extension SHOULD be .zip)
      Parameters:
        `lastSegmentFile` - the last segment of zip split files, note that the extension SHOULD be .zip
      Returns:
        SeekableByteChannel that concatenates all zip split files
      Throws:
        `IllegalArgumentException` - if the lastSegmentFile's extension is NOT .zip
        `IOException` - if the first channel doesn't seem to hold the beginning of a split archive

    - #### forFiles

          public static SeekableByteChannel forFiles(File... files)
                                              throws IOException

      Concatenates the given files.
      Parameters:
        `files` - the files to concatenate, note that the LAST FILE of files should be the LAST SEGMENT(.zip) and theses files should be added in correct order (e.g. .z01, .z02... .z99, .zip)
      Returns:
        SeekableByteChannel that concatenates all provided files
      Throws:
        `NullPointerException` - if files is null
        `IOException` - if opening a channel for one of the files fails
        `IOException` - if the first channel doesn't seem to hold the beginning of a split archive

    - #### forFiles

          public static SeekableByteChannel forFiles(File lastSegmentFile,
                                                     Iterable<File> files)
                                              throws IOException

      Concatenates the given files.
      Parameters:
        `lastSegmentFile` - the last segment of split zip segments, its extension should be .zip
        `files` - the files to concatenate except for the last segment, note theses files should be added in correct order (e.g. .z01, .z02... .z99)
      Returns:
        SeekableByteChannel that concatenates all provided files
      Throws:
        `IOException` - if the first channel doesn't seem to hold the beginning of a split archive
        `NullPointerException` - if files or lastSegmentFile is null

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