org.apache.tools.zip
Class ExtraFieldUtils

java.lang.Object
  org.apache.tools.zip.ExtraFieldUtils

public class ExtraFieldUtils
extends java.lang.Object

ZipExtraField related methods

Nested Class Summary

static class

ExtraFieldUtils.UnparseableExtraField "enum" for the possible actions to take if the extra field cannot be parsed.

Constructor Summary

ExtraFieldUtils()

Method Summary

static ZipExtraField	createExtraField(ZipShort headerId) Create an instance of the approriate ExtraField, falls back to UnrecognizedExtraField.
static byte[]	mergeCentralDirectoryData(ZipExtraField[] data) Merges the central directory fields of the given ZipExtraFields.
static byte[]	mergeLocalFileDataData(ZipExtraField[] data) Merges the local file data fields of the given ZipExtraFields.
static ZipExtraField[]	parse(byte[] data) Split the array into ExtraFields and populate them with the given data as local file data, throwing an exception if the data cannot be parsed.
static ZipExtraField[]	parse(byte[] data, boolean local) Split the array into ExtraFields and populate them with the given data, throwing an exception if the data cannot be parsed.
static ZipExtraField[]	parse(byte[] data, boolean local, ExtraFieldUtils.UnparseableExtraField onUnparseableData) Split the array into ExtraFields and populate them with the given data.
static void	register(java.lang.Class c) Register a ZipExtraField implementation.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtraFieldUtils

public ExtraFieldUtils()

Method Detail

register

public static void register(java.lang.Class c)

Register a ZipExtraField implementation.

The given class must have a no-arg constructor and implement the ZipExtraField interface.

Parameters:

c - the class to register

Since:

1.1

createExtraField

public static ZipExtraField createExtraField(ZipShort headerId)
                                      throws java.lang.InstantiationException,
                                             java.lang.IllegalAccessException

Create an instance of the approriate ExtraField, falls back to UnrecognizedExtraField.

Parameters:

headerId - the header identifier

Returns:

an instance of the appropiate ExtraField

Throws:

java.lang.InstantiationException - if unable to instantiate the class

java.lang.IllegalAccessException - if not allowed to instatiate the class

Since:

1.1

parse

public static ZipExtraField[] parse(byte[] data)
                             throws java.util.zip.ZipException

Split the array into ExtraFields and populate them with the given data as local file data, throwing an exception if the data cannot be parsed.

Parameters:

data - an array of bytes as it appears in local file data

Returns:

an array of ExtraFields

Throws:

java.util.zip.ZipException - on error

parse

public static ZipExtraField[] parse(byte[] data,
                                    boolean local)
                             throws java.util.zip.ZipException

Split the array into ExtraFields and populate them with the given data, throwing an exception if the data cannot be parsed.

Parameters:

data - an array of bytes

local - whether data originates from the local file data or the central directory

Returns:

an array of ExtraFields

Throws:

java.util.zip.ZipException - on error

Since:

1.1

parse

public static ZipExtraField[] parse(byte[] data,
                                    boolean local,
                                    ExtraFieldUtils.UnparseableExtraField onUnparseableData)
                             throws java.util.zip.ZipException

Split the array into ExtraFields and populate them with the given data.

Parameters:

data - an array of bytes

local - whether data originates from the local file data or the central directory

onUnparseableData - what to do if the extra field data cannot be parsed.

Returns:

an array of ExtraFields

Throws:

java.util.zip.ZipException - on error

Since:

Ant 1.8.1

mergeLocalFileDataData

public static byte[] mergeLocalFileDataData(ZipExtraField[] data)

Merges the local file data fields of the given ZipExtraFields.

Parameters:

data - an array of ExtraFiles

Returns:

an array of bytes

Since:

1.1

mergeCentralDirectoryData

public static byte[] mergeCentralDirectoryData(ZipExtraField[] data)

Merges the central directory fields of the given ZipExtraFields.

Parameters:

data - an array of ExtraFields

Returns:

an array of bytes

Since:

1.1