## org.apache.tools.zip
Class ExtraFieldUtils

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

    public class ExtraFieldUtils

extends java.lang.Object

ZipExtraField related methods

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 give 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 give data.

  Parameters:
    `data` - an array of bytes
  Returns:
    an array of ExtraFields
  Throws:
    `java.util.zip.ZipException` - on error
  Since:
    1.1

### 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