Pack200.Unpacker
public
static
interface
Pack200.Unpacker
| java.util.jar.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.
Summary
Constants | |
|---|---|
String |
DEFLATE_HINT
Property indicating that the unpacker should
ignore all transmitted values for DEFLATE_HINT,
replacing them by the given value, |
String |
FALSE
The string "false", a possible value for certain properties. |
String |
KEEP
The string "keep", a possible value for certain properties. |
String |
PROGRESS
The unpacker's progress as a percentage, as periodically updated by the unpacker. |
String |
TRUE
The string "true", a possible value for certain properties. |
Public methods | |
|---|---|
default
void
|
addPropertyChangeListener(PropertyChangeListener listener)
This method was deprecated
in API level 26.
The dependency on |
abstract
SortedMap<String, String>
|
properties()
Get the set of this engine's properties. |
default
void
|
removePropertyChangeListener(PropertyChangeListener listener)
This method was deprecated
in API level 26.
The dependency on |
abstract
void
|
unpack(InputStream in, JarOutputStream out)
Read a Pack200 archive, and write the encoded JAR to a JarOutputStream. |
abstract
void
|
unpack(File in, JarOutputStream out)
Read a Pack200 archive, and write the encoded JAR to a JarOutputStream. |
Constants
DEFLATE_HINT
public 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.
Constant Value: "unpack.deflate.hint"
FALSE
public static final String FALSE
The string "false", a possible value for certain properties.
See also:
Constant Value: "false"
KEEP
public static final String KEEP
The string "keep", a possible value for certain properties.
See also:
Constant Value: "keep"
PROGRESS
public 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.
Constant Value: "unpack.progress"
TRUE
public static final String TRUE
The string "true", a possible value for certain properties.
See also:
Constant Value: "true"
Public methods
addPropertyChangeListener
public void addPropertyChangeListener (PropertyChangeListener listener)
This method was deprecated
in API level 26.
The dependency on PropertyChangeListener creates
a significant impediment to future modularization of the
Java platform. This method will be removed in a future
release.
Applications that need to monitor progress of the
unpacker can poll the value of the PROGRESS property instead.
Registers a listener for PropertyChange events on the properties map. This is typically used by applications to update a progress bar.
The default implementation of this method does nothing and has no side-effects.
WARNING: This method is omitted from the interface
declaration in all subset Profiles of Java SE that do not include
the java.beans package.
| Parameters | |
|---|---|
listener |
PropertyChangeListener: An object to be invoked when a property is changed. |
See also:
properties
public abstract 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 | |
|---|---|
SortedMap<String, String> |
A sorted association of option key strings to option values. |
removePropertyChangeListener
public void removePropertyChangeListener (PropertyChangeListener listener)
This method was deprecated
in API level 26.
The dependency on PropertyChangeListener creates
a significant impediment to future modularization of the
Java platform. This method will be removed in a future
release.
Remove a listener for PropertyChange events, added by
the addPropertyChangeListener(PropertyChangeListener).
The default implementation of this method does nothing and has no side-effects.
WARNING: This method is omitted from the interface
declaration in all subset Profiles of Java SE that do not include
the java.beans package.
| Parameters | |
|---|---|
listener |
PropertyChangeListener: The PropertyChange listener to be removed. |
unpack
public abstract void unpack (InputStream in, JarOutputStream out)
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 |
InputStream: an InputStream. |
out |
JarOutputStream: a JarOutputStream. |
| Throws | |
|---|---|
IOException |
if an error is encountered. |
unpack
public abstract void unpack (File in, JarOutputStream out)
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 |
File: a File. |
out |
JarOutputStream: a JarOutputStream. |
| Throws | |
|---|---|
IOException |
if an error is encountered. |