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## rice.pastry
Class Id.Distance

    java.lang.Object
      rice.pastry.Id.Distance

All Implemented Interfaces:
  java.io.Serializable, java.lang.Comparable, Id.Distance

Enclosing class:
  Id

    public static class Id.Distance

extends java.lang.Object
implements Id.Distance

A class for representing and manipulating the distance between two Ids on the circle.

Version:
  $Id: Id.java 3613 2007-02-15 14:45:14Z jstewart $
Author:
  amislove
See Also:
  Serialized Form

Constructor Summary
`Id.Distance()` Constructor.
`Id.Distance(byte[] diff)` Constructor.
`Id.Distance(int[] diff)` Constructor.

Method Summary
`void` | `blit(byte[] target)` Blits the distance into a target array.
`void` | `blit(byte[] target, int offset)` Blits the distance into a target array, starting at the given offset.
`int` | `compareTo(java.lang.Object obj)` Comparison operator.
`byte[]` | `copy()` Copy the distance into a freshly generated array.
`boolean` | `equals(java.lang.Object obj)` Equality operator.
`int` | `hashCode()` Hash codes.
`Id.Distance` | `shift(int cnt, int fill)` Shift operator.
`Id.Distance` | `shift(int cnt, int fill, boolean roundUp)` Shift operator.
`Id.Distance` | `shiftDistance(int cnt, int fill)` Shift operator.
`java.lang.String` | `toString()` Returns a string representation of the distance The string is a byte string from most to least significant.

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

Constructor Detail

### Id.Distance

    public Id.Distance()

  Constructor.

### Id.Distance

    public Id.Distance(byte[] diff)

  Constructor.

  Parameters:
    `diff` - The different, as a byte array

### Id.Distance

    public Id.Distance(int[] diff)

  Constructor.

  Parameters:
    `diff` - The difference, as an int array

Method Detail

### blit

    public void blit(byte[] target)

  Blits the distance into a target array.

  Parameters:
    `target` - an array of length at least IdBitLength/8 for the distance to be stored in.

### blit

    public void blit(byte[] target,
                     int offset)

  Blits the distance into a target array, starting at the given offset.

  Parameters:
    `offset` - The offset to start at
    `target` - an array of length at least IdBitLength/8 for the distance to be stored in.

### copy

    public byte[] copy()

  Copy the distance into a freshly generated array.

  Returns:
    a fresh copy of the distance material

### compareTo

    public int compareTo(java.lang.Object obj)

  Comparison operator. The comparison that occurs is an absolute magnitude comparison.

  Specified by:
    `compareTo` in interface `java.lang.Comparable`
  Parameters:
    `obj` - the Distance to compare with.
  Returns:
    negative if this < obj, 0 if they are equal and positive if this > obj.

### equals

    public boolean equals(java.lang.Object obj)

  Equality operator.

  Overrides:
    `equals` in class `java.lang.Object`
  Parameters:
    `obj` - another Distance.
  Returns:
    true if they are the same, false otherwise.

### shift

    public Id.Distance shift(int cnt,
                             int fill)

  Shift operator. shift(-1,0) multiplies value of this by two, shift(1,0) divides by 2

  Parameters:
    `cnt` - the number of bits to shift, negative shifts left, positive shifts right
    `fill` - value of bit shifted in (0 if fill == 0, 1 otherwise)
  Returns:
    this

### shift

    public Id.Distance shift(int cnt,
                             int fill,
                             boolean roundUp)

  Shift operator. shift(-1,0) multiplies value of this by two, shift(1,0) divides by 2

  Parameters:
    `cnt` - the number of bits to shift, negative shifts left, positive shifts right
    `fill` - value of bit shifted in (0 if fill == 0, 1 otherwise)
    `roundUp` - if true, round up the results after right shifting
  Returns:
    this

### hashCode

    public int hashCode()

  Hash codes.

  Overrides:
    `hashCode` in class `java.lang.Object`
  Returns:
    a hash code.

### toString

    public java.lang.String toString()

  Returns a string representation of the distance The string is a byte string from most to least significant.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    The string representation of this distance

### shiftDistance

    public Id.Distance shiftDistance(int cnt,
                                     int fill)

  Shift operator. shift(-1,0) multiplies value of this by two, shift(1,0) divides by 2

  Specified by:
    `shiftDistance` in interface `Id.Distance`
  Parameters:
    `cnt` - the number of bits to shift, negative shifts left, positive shifts right
    `fill` - value of bit shifted in (0 if fill == 0, 1 otherwise)
  Returns:
    this

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