TarEntry

java.lang.Object
- org.apache.tools.tar.TarEntry

All Implemented Interfaces:: TarConstants

public class TarEntry
extends Object
implements TarConstants

This class represents an entry in a Tar archive. It consists of the entry's header, as well as the entry's File. Entries can be instantiated in one of three ways, depending on how they are to be used.

TarEntries that are created from the header bytes read from an archive are instantiated with the TarEntry( byte[] ) constructor. These entries will be used when extracting from or listing the contents of an archive. These entries have their header filled in using the header bytes. They also set the File to null, since they reference an archive entry not a file.

TarEntries that are created from Files that are to be written into an archive are instantiated with the TarEntry( File ) constructor. These entries have their header filled in using the File's information. They also keep a reference to the File for convenience when writing entries.

Finally, TarEntries can be constructed from nothing but a name. This allows the programmer to construct the entry by hand, for instance when only an InputStream is available for writing to the archive, and the header information is constructed from other information. In this case the header fields are set to defaults and the File is set to null.

The C structure for a Tar Entry's header is:

 struct header {
 char name[NAMSIZ];
 char mode[8];
 char uid[8];
 char gid[8];
 char size[12];
 char mtime[12];
 char chksum[8];
 char linkflag;
 char linkname[NAMSIZ];
 char magic[8];
 char uname[TUNMLEN];
 char gname[TGNMLEN];
 char devmajor[8];
 char devminor[8];
 } header;
 All unused bytes are set to null.
 New-style GNU tar files are slightly different from the above.
 For values of size larger than 077777777777L (11 7s)
 or uid and gid larger than 07777777L (7 7s)
 the sign bit of the first byte is set, and the rest of the
 field is the binary representation of the number.
 See TarUtils.parseOctalOrBinary.

The C structure for a old GNU Tar Entry's header is:

 struct oldgnu_header {
 char unused_pad1[345]; // TarConstants.PAD1LEN_GNU       - offset 0
 char atime[12];        // TarConstants.ATIMELEN_GNU      - offset 345
 char ctime[12];        // TarConstants.CTIMELEN_GNU      - offset 357
 char offset[12];       // TarConstants.OFFSETLEN_GNU     - offset 369
 char longnames[4];     // TarConstants.LONGNAMESLEN_GNU  - offset 381
 char unused_pad2;      // TarConstants.PAD2LEN_GNU       - offset 385
 struct sparse sp[4];   // TarConstants.SPARSELEN_GNU     - offset 386
 char isextended;       // TarConstants.ISEXTENDEDLEN_GNU - offset 482
 char realsize[12];     // TarConstants.REALSIZELEN_GNU   - offset 483
 char unused_pad[17];   // TarConstants.PAD3LEN_GNU       - offset 495
 };

Whereas, "struct sparse" is:

 struct sparse {
 char offset[12];   // offset 0
 char numbytes[12]; // offset 12
 };

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`DEFAULT_DIR_MODE` Default permissions bits for directories
`static int`	`DEFAULT_FILE_MODE` Default permissions bits for files
`static int`	`MAX_NAMELEN` Maximum length of a user's name in the tar file
`static int`	`MILLIS_PER_SECOND` Convert millis to seconds

Constructor Summary

Constructors
Constructor and Description
`TarEntry(byte[] headerBuf)` Construct an entry from an archive's header bytes.
`TarEntry(byte[] headerBuf, ZipEncoding encoding)` Construct an entry from an archive's header bytes.
`TarEntry(File file)` Construct an entry for a file.
`TarEntry(File file, String fileName)` Construct an entry for a file.
`TarEntry(String name)` Construct an entry with only a name.
`TarEntry(String name, boolean preserveLeadingSlashes)` Construct an entry with only a name.
`TarEntry(String name, byte linkFlag)` Construct an entry with a name and a link flag.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`equals(Object it)` Determine if the two entries are equal.
`boolean`	`equals(TarEntry it)` Determine if the two entries are equal.
`int`	`getDevMajor()` Get this entry's major device number.
`int`	`getDevMinor()` Get this entry's minor device number.
`TarEntry[]`	`getDirectoryEntries()` If this entry represents a file, and the file is a directory, return an array of TarEntries for this entry's children.
`File`	`getFile()` Get this entry's file.
`String`	`getGroupName()` Get this entry's group name.
`String`	`getLinkName()` Get this entry's link name.
`long`	`getLongGroupId()` Get this entry's group id.
`long`	`getLongUserId()` Get this entry's user id.
`int`	`getMode()` Get this entry's mode.
`Date`	`getModTime()` Set this entry's modification time.
`String`	`getName()` Get this entry's name.
`long`	`getRealSize()` Get this entry's real file size in case of a sparse file.
`long`	`getSize()` Get this entry's file size.
`String`	`getUserName()` Get this entry's user name.
`int`	`hashCode()` Hashcodes are based on entry names.
`boolean`	`isBlockDevice()`
`boolean`	`isCharacterDevice()` Check if this is a character device entry.
`boolean`	`isDescendent(TarEntry desc)` Determine if the given entry is a descendant of this entry.
`boolean`	`isDirectory()` Return whether or not this entry represents a directory.
`boolean`	`isExtended()` Indicates in case of a sparse file if an extension sparse header follows.
`boolean`	`isFIFO()`
`boolean`	`isFile()` Check if this is a "normal file".
`boolean`	`isGlobalPaxHeader()` Check if this is a Pax header.
`boolean`	`isGNULongLinkEntry()` Indicate if this entry is a GNU long linkname block
`boolean`	`isGNULongNameEntry()` Indicate if this entry is a GNU long name block
`boolean`	`isGNUSparse()` Indicate if this entry is a GNU sparse block.
`boolean`	`isLink()` Check if this is a link entry.
`boolean`	`isPaxHeader()` Check if this is a Pax header.
`boolean`	`isSymbolicLink()` Check if this is a symbolic link entry.
`void`	`parseTarHeader(byte[] header)` Parse an entry's header information from a header buffer.
`void`	`parseTarHeader(byte[] header, ZipEncoding encoding)` Parse an entry's header information from a header buffer.
`void`	`setDevMajor(int devNo)` Set this entry's major device number.
`void`	`setDevMinor(int devNo)` Set this entry's minor device number.
`void`	`setGroupId(int groupId)` Set this entry's group id.
`void`	`setGroupId(long groupId)` Set this entry's group id.
`void`	`setGroupName(String groupName)` Set this entry's group name.
`void`	`setIds(int userId, int groupId)` Convenience method to set this entry's group and user ids.
`void`	`setLinkName(String link)` Set this entry's link name.
`void`	`setMode(int mode)` Set the mode for this entry
`void`	`setModTime(Date time)` Set this entry's modification time.
`void`	`setModTime(long time)` Set this entry's modification time.
`void`	`setName(String name)` Set this entry's name.
`void`	`setNames(String userName, String groupName)` Convenience method to set this entry's group and user names.
`void`	`setSize(long size)` Set this entry's file size.
`void`	`setUserId(int userId)` Set this entry's user id.
`void`	`setUserId(long userId)` Set this entry's user id.
`void`	`setUserName(String userName)` Set this entry's user name.
`void`	`writeEntryHeader(byte[] outbuf)` Write an entry's header information to a header buffer.
`void`	`writeEntryHeader(byte[] outbuf, ZipEncoding encoding, boolean starMode)` Write an entry's header information to a header buffer.

Methods inherited from class java.lang.Object
clone, getClass, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DEFAULT_DIR_MODE
```
public static final int DEFAULT_DIR_MODE
```
    Default permissions bits for directories
    
    See Also:
    
    Constant Field Values
  - DEFAULT_FILE_MODE
```
public static final int DEFAULT_FILE_MODE
```
    Default permissions bits for files
    
    See Also:
    
    Constant Field Values
  - MAX_NAMELEN
```
public static final int MAX_NAMELEN
```
    Maximum length of a user's name in the tar file
    
    See Also:
    
    Constant Field Values
  - MILLIS_PER_SECOND
```
public static final int MILLIS_PER_SECOND
```
    Convert millis to seconds
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - TarEntry
```
public TarEntry(byte[] headerBuf)
```
    Construct an entry from an archive's header bytes. File is set to null.
    
    Parameters:
    
    headerBuf - The header bytes from a tar archive entry.
    
    Throws:
    
    IllegalArgumentException - if any of the numeric fields have an invalid format
  - TarEntry
```
public TarEntry(byte[] headerBuf,
                ZipEncoding encoding)
         throws IOException
```
    Construct an entry from an archive's header bytes. File is set to null.
    
    Parameters:
    
    headerBuf - The header bytes from a tar archive entry.
    
    encoding - encoding to use for file names
    
    Throws:
    
    IllegalArgumentException - if any of the numeric fields have an invalid format
    
    IOException - if an error occurs during reading the archive
  - TarEntry
```
public TarEntry(File file)
```
    Construct an entry for a file. File is set to file, and the header is constructed from information from the file. The name is set from the normalized file path.
    
    Parameters:
    
    file - The file that the entry represents.
  - TarEntry
```
public TarEntry(File file,
                String fileName)
```
    Construct an entry for a file. File is set to file, and the header is constructed from information from the file.
    
    Parameters:
    
    file - The file that the entry represents.
    
    fileName - the name to be used for the entry.
  - TarEntry
```
public TarEntry(String name)
```
    Construct an entry with only a name. This allows the programmer to construct the entry's header "by hand". File is set to null.
    
    Parameters:
    
    name - the entry name
  - TarEntry
```
public TarEntry(String name,
                boolean preserveLeadingSlashes)
```
    Construct an entry with only a name. This allows the programmer to construct the entry's header "by hand". File is set to null.
    
    Parameters:
    
    name - the entry name
    
    preserveLeadingSlashes - whether to allow leading slashes in the name.
  - TarEntry
```
public TarEntry(String name,
                byte linkFlag)
```
    Construct an entry with a name and a link flag.
    
    Parameters:
    
    name - the entry name
    
    linkFlag - the entry link flag.
- Method Detail
  - equals
```
public boolean equals(Object it)
```
    Determine if the two entries are equal. Equality is determined by the header names being equal.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    
    it - Entry to be checked for equality.
    
    Returns:
    
    True if the entries are equal.
    
    See Also:
    
    Object.hashCode(), HashMap
  - equals
```
public boolean equals(TarEntry it)
```
    Determine if the two entries are equal. Equality is determined by the header names being equal.
    
    Parameters:
    
    it - Entry to be checked for equality.
    
    Returns:
    
    True if the entries are equal.
  - getDevMajor
```
public int getDevMajor()
```
    Get this entry's major device number.
    
    Returns:
    
    This entry's major device number.
  - getDevMinor
```
public int getDevMinor()
```
    Get this entry's minor device number.
    
    Returns:
    
    This entry's minor device number.
  - getDirectoryEntries
```
public TarEntry[] getDirectoryEntries()
```
    If this entry represents a file, and the file is a directory, return an array of TarEntries for this entry's children.
    
    Returns:
    
    An array of TarEntry's for this entry's children.
  - getFile
```
public File getFile()
```
    Get this entry's file.
    
    Returns:
    
    This entry's file.
  - getGroupName
```
public String getGroupName()
```
    Get this entry's group name.
    
    Returns:
    
    This entry's group name.
  - getLinkName
```
public String getLinkName()
```
    Get this entry's link name.
    
    Returns:
    
    This entry's link name.
  - getLongGroupId
```
public long getLongGroupId()
```
    Get this entry's group id.
    
    Returns:
    
    This entry's group id.
    
    Since:
    
    1.9.5
  - getLongUserId
```
public long getLongUserId()
```
    Get this entry's user id.
    
    Returns:
    
    This entry's user id.
    
    Since:
    
    1.9.5
  - getMode
```
public int getMode()
```
    Get this entry's mode.
    
    Returns:
    
    This entry's mode.
  - getModTime
```
public Date getModTime()
```
    Set this entry's modification time.
    
    Returns:
    
    time This entry's new modification time.
  - getName
```
public String getName()
```
    Get this entry's name.
    
    Returns:
    
    This entry's name.
  - getRealSize
```
public long getRealSize()
```
    Get this entry's real file size in case of a sparse file.
    
    Returns:
    
    This entry's real file size.
  - getSize
```
public long getSize()
```
    Get this entry's file size.
    
    Returns:
    
    This entry's file size.
  - getUserName
```
public String getUserName()
```
    Get this entry's user name.
    
    Returns:
    
    This entry's user name.
  - hashCode
```
public int hashCode()
```
    Hashcodes are based on entry names.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    the entry hashcode
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - isBlockDevice
```
public boolean isBlockDevice()
```
    Returns:
    
    true if this is a block device entry.
  - isCharacterDevice
```
public boolean isCharacterDevice()
```
    Check if this is a character device entry.
    
    Returns:
    
    true if it is a character device entry
  - isDescendent
```
public boolean isDescendent(TarEntry desc)
```
    Determine if the given entry is a descendant of this entry. Descendancy is determined by the name of the descendant starting with this entry's name.
    
    Parameters:
    
    desc - Entry to be checked as a descendant of this.
    
    Returns:
    
    True if entry is a descendant of this.
  - isDirectory
```
public boolean isDirectory()
```
    Return whether or not this entry represents a directory.
    
    Returns:
    
    True if this entry is a directory.
  - isExtended
```
public boolean isExtended()
```
    Indicates in case of a sparse file if an extension sparse header follows.
    
    Returns:
    
    true if an extension sparse header follows.
  - isFIFO
```
public boolean isFIFO()
```
    Returns:
    
    true if this is a FIFO (pipe) entry.
  - isFile
```
public boolean isFile()
```
    Check if this is a "normal file".
    
    Returns:
    
    true if it is a 'normal' file
  - isGlobalPaxHeader
```
public boolean isGlobalPaxHeader()
```
    Check if this is a Pax header.
    
    Returns:
    
    true if this is a Pax header.
  - isGNULongLinkEntry
```
public boolean isGNULongLinkEntry()
```
    Indicate if this entry is a GNU long linkname block
    
    Returns:
    
    true if this is a long name extension provided by GNU tar
  - isGNULongNameEntry
```
public boolean isGNULongNameEntry()
```
    Indicate if this entry is a GNU long name block
    
    Returns:
    
    true if this is a long name extension provided by GNU tar
  - isGNUSparse
```
public boolean isGNUSparse()
```
    Indicate if this entry is a GNU sparse block.
    
    Returns:
    
    true if this is a sparse extension provided by GNU tar
  - isLink
```
public boolean isLink()
```
    Check if this is a link entry.
    
    Returns:
    
    true if it is a link
  - isPaxHeader
```
public boolean isPaxHeader()
```
    Check if this is a Pax header.
    
    Returns:
    
    true if this is a Pax header.
  - isSymbolicLink
```
public boolean isSymbolicLink()
```
    Check if this is a symbolic link entry.
    
    Returns:
    
    true if it is a symlink
  - parseTarHeader
```
public void parseTarHeader(byte[] header)
```
    Parse an entry's header information from a header buffer.
    
    Parameters:
    
    header - The tar entry header buffer to get information from.
    
    Throws:
    
    IllegalArgumentException - if any of the numeric fields have an invalid format
  - parseTarHeader
```
public void parseTarHeader(byte[] header,
                           ZipEncoding encoding)
                    throws IOException
```
    Parse an entry's header information from a header buffer.
    
    Parameters:
    
    header - The tar entry header buffer to get information from.
    
    encoding - encoding to use for file names
    
    Throws:
    
    IllegalArgumentException - if any of the numeric fields have an invalid format
    
    IOException - if an error occurs while reading the archive
  - setDevMajor
```
public void setDevMajor(int devNo)
```
    Set this entry's major device number.
    
    Parameters:
    
    devNo - This entry's major device number.
    
    Throws:
    
    IllegalArgumentException - if the devNo is < 0.
  - setDevMinor
```
public void setDevMinor(int devNo)
```
    Set this entry's minor device number.
    
    Parameters:
    
    devNo - This entry's minor device number.
    
    Throws:
    
    IllegalArgumentException - if the devNo is < 0.
  - setGroupId
```
public void setGroupId(int groupId)
```
    Set this entry's group id.
    
    Parameters:
    
    groupId - This entry's new group id.
  - setGroupId
```
public void setGroupId(long groupId)
```
    Set this entry's group id.
    
    Parameters:
    
    groupId - This entry's new group id.
    
    Since:
    
    1.9.5
  - setGroupName
```
public void setGroupName(String groupName)
```
    Set this entry's group name.
    
    Parameters:
    
    groupName - This entry's new group name.
  - setIds
```
public void setIds(int userId,
                   int groupId)
```
    Convenience method to set this entry's group and user ids.
    
    Parameters:
    
    userId - This entry's new user id.
    
    groupId - This entry's new group id.
  - setLinkName
```
public void setLinkName(String link)
```
    Set this entry's link name.
    
    Parameters:
    
    link - the link name to use.
  - setMode
```
public void setMode(int mode)
```
    Set the mode for this entry
    
    Parameters:
    
    mode - the mode for this entry
  - setModTime
```
public void setModTime(Date time)
```
    Set this entry's modification time.
    
    Parameters:
    
    time - This entry's new modification time.
  - setModTime
```
public void setModTime(long time)
```
    Set this entry's modification time. The parameter passed to this method is in "Java time".
    
    Parameters:
    
    time - This entry's new modification time.
  - setName
```
public void setName(String name)
```
    Set this entry's name.
    
    Parameters:
    
    name - This entry's new name.
  - setNames
```
public void setNames(String userName,
                     String groupName)
```
    Convenience method to set this entry's group and user names.
    
    Parameters:
    
    userName - This entry's new user name.
    
    groupName - This entry's new group name.
  - setSize
```
public void setSize(long size)
```
    Set this entry's file size.
    
    Parameters:
    
    size - This entry's new file size.
    
    Throws:
    
    IllegalArgumentException - if the size is < 0.
  - setUserId
```
public void setUserId(int userId)
```
    Set this entry's user id.
    
    Parameters:
    
    userId - This entry's new user id.
  - setUserId
```
public void setUserId(long userId)
```
    Set this entry's user id.
    
    Parameters:
    
    userId - This entry's new user id.
    
    Since:
    
    1.9.5
  - setUserName
```
public void setUserName(String userName)
```
    Set this entry's user name.
    
    Parameters:
    
    userName - This entry's new user name.
  - writeEntryHeader
```
public void writeEntryHeader(byte[] outbuf)
```
    Write an entry's header information to a header buffer.
    This method does not use the star/GNU tar/BSD tar extensions.
    
    Parameters:
    
    outbuf - The tar entry header buffer to fill in.
  - writeEntryHeader
```
public void writeEntryHeader(byte[] outbuf,
                             ZipEncoding encoding,
                             boolean starMode)
                      throws IOException
```
    Write an entry's header information to a header buffer.
    
    Parameters:
    
    outbuf - The tar entry header buffer to fill in.
    
    encoding - encoding to use when writing the file name.
    
    starMode - whether to use the star/GNU tar/BSD tar extension for numeric fields if their value doesn't fit in the maximum size of standard tar archives
    
    Throws:
    
    IOException - if an error occurs while writing the archive

Class TarEntry

Field Summary

Fields inherited from interface org.apache.tools.tar.TarConstants

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_DIR_MODE

DEFAULT_FILE_MODE

MAX_NAMELEN

MILLIS_PER_SECOND

Constructor Detail

TarEntry

TarEntry

TarEntry

TarEntry

TarEntry

TarEntry

TarEntry

Method Detail

equals

equals

getDevMajor

getDevMinor

getDirectoryEntries

getFile

getGroupName

getLinkName

getLongGroupId

getLongUserId

getMode

getModTime

getName

getRealSize

getSize

getUserName

hashCode

isBlockDevice

isCharacterDevice

isDescendent

isDirectory

isExtended

isFIFO

isFile

isGlobalPaxHeader

isGNULongLinkEntry

isGNULongNameEntry

isGNUSparse

isLink

isPaxHeader

isSymbolicLink

parseTarHeader

parseTarHeader

setDevMajor

setDevMinor

setGroupId

setGroupId

setGroupName

setIds

setLinkName

setMode

setModTime

setModTime

setName

setNames

setSize

setUserId

setUserId

setUserName

writeEntryHeader

writeEntryHeader