Package Summary Overview Summary

### class:Pack200.Unpacker [NONE]
- 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

### field:KEEP [NONE]
- #### KEEP
      static final String KEEP
The string "keep", a possible value for certain properties. See Also: `DEFLATE_HINT`, Constant Field Values

### field:TRUE [NONE]
- #### TRUE
      static final String TRUE
The string "true", a possible value for certain properties. See Also: `DEFLATE_HINT`, Constant Field Values

### field:FALSE [NONE]
- #### FALSE
      static final String FALSE
The string "false", a possible value for certain properties. See Also: `DEFLATE_HINT`, Constant Field Values

### field:DEFLATE_HINT [NONE]
- #### DEFLATE_HINT
      static final String DEFLATE_HINT
Property indicating that the unpacker should ignore all transmitted values for DEFLATE_HINT, replacing them by the given value, `TRUE` or `FALSE`. The default value is the special string `KEEP`, which asks the unpacker to preserve all transmitted deflation hints. See Also: Constant Field Values

### field:PROGRESS [NONE]
- #### PROGRESS
      static final String PROGRESS
The unpacker's progress as a percentage, as periodically updated by the unpacker. Values of 0 - 100 are normal, and -1 indicates a stall. Progress can be monitored by polling the value of this property. At a minimum, the unpacker must set progress to 0 at the beginning of a packing operation, and to 100 at the end. See Also: Constant Field Values

### method:properties() [NONE]
- #### 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.

### method:unpack(java.io.InputStream, java.util.jar.JarOutputStream) [NONE]
- #### 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.

### method:unpack(java.io.File, java.util.jar.JarOutputStream) [NONE]
- #### 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.