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## org.tmatesoft.svn.core.wc
Class SVNRevision

    java.lang.Object
      org.tmatesoft.svn.core.wc.SVNRevision

public class SVNRevision
extends Object

SVNRevision is a revision wrapper used for an abstract representation of revision information.

Most of high-level API classes' methods receive revision parameters as SVNRevision objects to get information on SVN revisions and use it in version control operations.

This class provides advantages of specifying revisions either as just long numbers or dated revisions (when a revision is determined according to a particular timestamp) or SVN compatible keywords denoting the latest revision (HEAD), Working Copy pristine revision (BASE) and so on. And one more feature is that SVNRevision can parse strings (that can be anything: string representations of numbers, dates, keywords) to construct an SVNRevision to use.

Since:
  1.2
Version:
  1.3
Author:
  TMate Software Ltd.

Field Summary
`static SVNRevision` | `BASE` Denotes the 'pristine' revision of a Working Copy item.
`static SVNRevision` | `COMMITTED` Denotes the last revision in which an item was changed before (or at) BASE.
`static SVNRevision` | `HEAD` Denotes the latest repository revision.
`static SVNRevision` | `PREVIOUS` Denotes the revision just before the one when an item was last changed (technically, COMMITTED - 1).
`static SVNRevision` | `UNDEFINED` Used to denote that a revision is undefined (not available or not valid).
`static SVNRevision` | `WORKING` Denotes an item's working (current) revision.

Method Summary
`static SVNRevision` | `create(Date date)` Creates an SVNRevision object given a particular timestamp.
`static SVNRevision` | `create(long revisionNumber)` Creates an SVNRevision object given a revision number.
`boolean` | `equals(Object o)` Compares this object with another SVNRevision object.
`Date` | `getDate()` Gets the timestamp used to specify a revision.
`int` | `getID()` Gets the identifier of the revision information kind this object represents.
`String` | `getName()` Gets the revision keyword name.
`long` | `getNumber()` Gets the revision number represented by this object.
`int` | `hashCode()` Evaluates the hash code for this object.
`boolean` | `isLocal()` Determines if the revision represented by this abstract object is Working Copy specific - that is one of `BASE` or `WORKING`.
`boolean` | `isValid()` Checks if the revision information represented by this object is valid.
`static boolean` | `isValidRevisionNumber(long revision)` Checks whether a revision number is valid.
`static SVNRevision` | `parse(String value)` Parses an input string and be it a representation of either a revision number, or a timestamp, or a revision keyword, constructs an SVNRevision representation of the revision.
`String` | `toString()` Gives a string representation of this object.

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

Field Detail

### HEAD

    public static final SVNRevision HEAD

  Denotes the latest repository revision. SVN's analogue keyword: HEAD.

### WORKING

    public static final SVNRevision WORKING

  Denotes an item's working (current) revision. This is a SVNKit constant that should be provided to mean working revisions (what the native SVN client assumes by default).

### PREVIOUS

    public static final SVNRevision PREVIOUS

  Denotes the revision just before the one when an item was last changed (technically, COMMITTED - 1). SVN's analogue keyword: PREV.

### BASE

    public static final SVNRevision BASE

  Denotes the 'pristine' revision of a Working Copy item. SVN's analogue keyword: BASE.

### COMMITTED

    public static final SVNRevision COMMITTED

  Denotes the last revision in which an item was changed before (or at) BASE. SVN's analogue keyword: COMMITTED.

### UNDEFINED

    public static final SVNRevision UNDEFINED

  Used to denote that a revision is undefined (not available or not valid).

Method Detail

### getName

    public String getName()

  Gets the revision keyword name. Each of SVNRevision's constant fields that represent revision keywords also have its own name.

  Returns:
    a revision keyword name

### getNumber

    public long getNumber()

  Gets the revision number represented by this object.

  Returns:
    a revision number; -1 is returned when this object represents a revision information not using a revision number.

### getDate

    public Date getDate()

  Gets the timestamp used to specify a revision.

  Returns:
    a timestamp if any specified for this object

### isValid

    public boolean isValid()

  Checks if the revision information represented by this object is valid.

  `UNDEFINED` is not a valid revision.

  Returns:
    true if valid, otherwise false

### getID

    public int getID()

  Gets the identifier of the revision information kind this object represents.

  Returns:
    this object's id

### hashCode

    public int hashCode()

  Evaluates the hash code for this object. A hash code is evaluated in this way:
  - if this object represents revision info as a revision number then `hash code = (int) revisionNumber & 0xFFFFFFFF`;
  - if this object represents revision info as a timestamp then `Date.hashCode()` is used;
  - if this object represents revision info as a keyword then `String.hashCode()` is used for the keyword name;

  Returns:
    this object's hash code

### equals

    public boolean equals(Object o)

  Compares this object with another SVNRevision object.

  Parameters:
    `o` - an object to be compared with; if it's not an SVNRevision then this method certainly returns false
  Returns:
    true if equal, otherwise false

### isValidRevisionNumber

    public static boolean isValidRevisionNumber(long revision)

  Checks whether a revision number is valid.

  Parameters:
    `revision` - a revision number
  Returns:
    true if valid (`>=0`), otherwise false

### create

    public static SVNRevision create(long revisionNumber)

  Creates an SVNRevision object given a revision number.

  Parameters:
    `revisionNumber` - a definite revision number
  Returns:
    the constructed SVNRevision object

### create

    public static SVNRevision create(Date date)

  Creates an SVNRevision object given a particular timestamp.

  Parameters:
    `date` - a timestamp represented as a Date instance
  Returns:
    the constructed SVNRevision object

### isLocal

    public boolean isLocal()

  Determines if the revision represented by this abstract object is Working Copy specific - that is one of `BASE` or `WORKING`.

  Returns:
    true if this object represents a kind of a local revision, otherwise false

### parse

    public static SVNRevision parse(String value)

  Parses an input string and be it a representation of either a revision number, or a timestamp, or a revision keyword, constructs an SVNRevision representation of the revision.

  Parameters:
    `value` - a string to be parsed
  Returns:
    an SVNRevision object that holds the revision information parsed from `value`; however if an input string is not a valid one which can be successfully transformed to an SVNRevision the return value is `UNDEFINED`

### toString

    public String toString()

  Gives a string representation of this object.

  Returns:
    a string representing this object

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