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java.util.jar

Interface Pack200.Unpacker

Contents
  • Enclosing class:
    Pack200

    public static interface Pack200.Unpacker
    The unpacker engine converts the packed stream to a JAR file. An instance of the engine can be obtained using Pack200.newUnpacker().

    Every JAR file produced by this engine will include the string "PACK200" as a zip file comment. This allows a deployer to detect if a JAR archive was packed and unpacked.

    Note: Unless otherwise noted, passing a null argument to a constructor or method in this class will cause a NullPointerException to be thrown.

    This version of the unpacker is compatible with all previous versions.

    Since:
    1.5

    • Method Detail

      • properties

        SortedMap<String,String> properties()
        Get the set of this engine's properties. This set is a "live view", so that changing its contents immediately affects the Packer engine, and changes from the engine (such as progress indications) are immediately visible in the map.

        The property map may contain pre-defined implementation specific and default properties. Users are encouraged to read the information and fully understand the implications, before modifying pre-existing properties.

        Implementation specific properties are prefixed with a package name associated with the implementor, beginning with com. or a similar prefix. All property names beginning with pack. and unpack. are reserved for use by this API.

        Unknown properties may be ignored or rejected with an unspecified error, and invalid entries may cause an unspecified error to be thrown.

        Returns:
        A sorted association of option key strings to option values.

      • unpack

        void unpack(InputStream in,
          JarOutputStream out)
            throws IOException
        Read a Pack200 archive, and write the encoded JAR to a JarOutputStream. The entire contents of the input stream will be read. It may be more efficient to read the Pack200 archive to a file and pass the File object, using the alternate method described below.

        Closes its input but not its output. (The output can accumulate more elements.)

        Parameters:
        in - an InputStream.
        out - a JarOutputStream.
        Throws:
        IOException - if an error is encountered.

      • unpack

        void unpack(File in,
          JarOutputStream out)
            throws IOException
        Read a Pack200 archive, and write the encoded JAR to a JarOutputStream.

        Does not close its output. (The output can accumulate more elements.)

        Parameters:
        in - a File.
        out - a JarOutputStream.
        Throws:
        IOException - if an error is encountered.

      • addPropertyChangeListener

        void addPropertyChangeListener(PropertyChangeListener listener)
        Registers a listener for PropertyChange events on the properties map. This is typically used by applications to update a progress bar.
        Parameters:
        listener - An object to be invoked when a property is changed.
        See Also:
        properties(), PROGRESS
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