# ArArchiveEntry (Apache Commons Compress 1.13 API)

org.apache.commons.compress.archivers.ar

## Class ArArchiveEntry

- java.lang.Object
- - org.apache.commons.compress.archivers.ar.ArArchiveEntry

- All Implemented Interfaces:
    ArchiveEntry

      public class ArArchiveEntry
      extends Object
      implements ArchiveEntry

  Represents an archive entry in the "ar" format. Each AR archive starts with "!<arch>" followed by a LF. After these 8 bytes the archive entries are listed. The format of an entry header is as it follows:

       START BYTE   END BYTE    NAME                    FORMAT      LENGTH
       0            15          File name               ASCII       16
       16           27          Modification timestamp  Decimal     12
       28           33          Owner ID                Decimal     6
       34           39          Group ID                Decimal     6
       40           47          File mode               Octal       8
       48           57          File size (bytes)       Decimal     10
       58           59          File magic              \140\012    2

  This specifies that an ar archive entry header contains 60 bytes. Due to the limitation of the file name length to 16 bytes GNU and BSD has their own variants of this format. Currently Commons Compress can read but not write the GNU variant. It fully supports the BSD variant.
  See Also:
    ar man page
  This class is immutable

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `HEADER` The header for each entry
    `static String` | `TRAILER` The trailer for each entry

    - ### Fields inherited from interface org.apache.commons.compress.archivers.ArchiveEntry

      `SIZE_UNKNOWN`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `ArArchiveEntry(File inputFile, String entryName)` Create a new instance using the attributes of the given file
    `ArArchiveEntry(String name, long length)` Create a new instance using a couple of default values.
    `ArArchiveEntry(String name, long length, int userId, int groupId, int mode, long lastModified)` Create a new instance.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `equals(Object obj)`
    `int` | `getGroupId()`
    `long` | `getLastModified()` Last modified time in seconds since the epoch.
    `Date` | `getLastModifiedDate()` Gets the last modified date of this entry.
    `long` | `getLength()`
    `int` | `getMode()`
    `String` | `getName()` Gets the name of the entry in this archive.
    `long` | `getSize()` Gets the uncompressed size of this entry.
    `int` | `getUserId()`
    `int` | `hashCode()`
    `boolean` | `isDirectory()` Returns true if this entry refers to a directory.

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### HEADER

          public static final String HEADER

      The header for each entry
      See Also:
        Constant Field Values

    - #### TRAILER

          public static final String TRAILER

      The trailer for each entry
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### ArArchiveEntry

          public ArArchiveEntry(String name,
                        long length)

      Create a new instance using a couple of default values.

      Sets userId and groupId to 0, the octal file mode to 644 and the last modified time to the current time.

      Parameters:
        `name` - name of the entry
        `length` - length of the entry in bytes

    - #### ArArchiveEntry

          public ArArchiveEntry(String name,
                        long length,
                        int userId,
                        int groupId,
                        int mode,
                        long lastModified)

      Create a new instance.
      Parameters:
        `name` - name of the entry
        `length` - length of the entry in bytes
        `userId` - numeric user id
        `groupId` - numeric group id
        `mode` - file mode
        `lastModified` - last modified time in seconds since the epoch

    - #### ArArchiveEntry

          public ArArchiveEntry(File inputFile,
                        String entryName)

      Create a new instance using the attributes of the given file
      Parameters:
        `inputFile` - the file to create an entry from
        `entryName` - the name of the entry

  - ### Method Detail

    - #### getSize

          public long getSize()

      Description copied from interface: `ArchiveEntry`
      Gets the uncompressed size of this entry. May be -1 (SIZE_UNKNOWN) if the size is unknown
      Specified by:
        `getSize` in interface `ArchiveEntry`
      Returns:
        the uncompressed size of this entry.

    - #### getName

          public String getName()

      Description copied from interface: `ArchiveEntry`
      Gets the name of the entry in this archive. May refer to a file or directory or other item.
      Specified by:
        `getName` in interface `ArchiveEntry`
      Returns:
        The name of this entry in the archive.

    - #### getUserId

          public int getUserId()

    - #### getGroupId

          public int getGroupId()

    - #### getMode

          public int getMode()

    - #### getLastModified

          public long getLastModified()

      Last modified time in seconds since the epoch.
      Returns:
        the last modified date

    - #### getLastModifiedDate

          public Date getLastModifiedDate()

      Description copied from interface: `ArchiveEntry`
      Gets the last modified date of this entry.
      Specified by:
        `getLastModifiedDate` in interface `ArchiveEntry`
      Returns:
        the last modified date of this entry.

    - #### getLength

          public long getLength()

    - #### isDirectory

          public boolean isDirectory()

      Description copied from interface: `ArchiveEntry`
      Returns true if this entry refers to a directory.
      Specified by:
        `isDirectory` in interface `ArchiveEntry`
      Returns:
        true if this entry refers to a directory.

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### equals

          public boolean equals(Object obj)

      Overrides:
        `equals` in class `Object`

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