edu.virginia.cs.mng.hypercast.DT
Class DT_LogicalAddress

java.lang.Object
  |
  +--edu.virginia.cs.mng.hypercast.DT.DT_Point
        |
        +--edu.virginia.cs.mng.hypercast.DT.DT_LogicalAddress
final class DT_LogicalAddress
extends DT_Point
implements I_LogicalAddress

A logical address on the Delaunay triangulation. It extends DT_Point. It is immutable.

Field Summary
static int ADDRESS_ARRAY_SIZE
           
private static java.util.Random rand
          length of byte array required to hold the address
 
Fields inherited from class edu.virginia.cs.mng.hypercast.DT.DT_Point
x, y
 
Constructor Summary
DT_LogicalAddress(byte[] array, int offset)
          Reads coordinates from a byte array.
DT_LogicalAddress(DT_LogicalAddress dtla)
           
DT_LogicalAddress(int xx, int yy)
          constructor with the coodinates pair
DT_LogicalAddress(IP_Address a)
          Creates coordinate such that if 2 nodes are on the same network, they have close coordinates.
DT_LogicalAddress(java.lang.String s)
          Reads coordinates from string in format "\d+,\d+".
 
Method Summary
private static int everyOtherBit(IP_Address a, boolean evenBits)
          This function converts the IP_Address to a long, and then creates an integer made from every other bit of the IP_Address.
 int getSize()
          Returns the size of byte[] used to store address.
 boolean greaterThan(I_Address a)
          Implements method of I_Address interface.
 byte[] toByteArray()
          Converts the object into a byte array for transfer in a message.
 
Methods inherited from class edu.virginia.cs.mng.hypercast.DT.DT_Point
angleRelative, angleToHorizon, distance, equals, findCenterOfCircle, getX, getY, greaterThan, hashCode, isInCircle, isInOrOnCircle, isOnCircle, toString
 
Methods inherited from class java.lang.Object
, clone, finalize, getClass, notify, notifyAll, registerNatives, wait, wait, wait
 

Field Detail

rand

private static final java.util.Random rand
length of byte array required to hold the address

ADDRESS_ARRAY_SIZE

public static final int ADDRESS_ARRAY_SIZE
Constructor Detail

DT_LogicalAddress

public DT_LogicalAddress(int xx,
                         int yy)
constructor with the coodinates pair

DT_LogicalAddress

public DT_LogicalAddress(DT_LogicalAddress dtla)

DT_LogicalAddress

public DT_LogicalAddress(byte[] array,
                         int offset)
Reads coordinates from a byte array. It reads 8 bytes - the first 4 making the x-coordinate, the last 4 making the y-coordinate.

DT_LogicalAddress

public DT_LogicalAddress(java.lang.String s)
Reads coordinates from string in format "\d+,\d+". (e.g. "12345,67890")

DT_LogicalAddress

public DT_LogicalAddress(IP_Address a)
Creates coordinate such that if 2 nodes are on the same network, they have close coordinates. This is accomplished by taking every even-number bit in the IP_Address to make the x-coordinate, and every odd-numbered bit to make the y-coordinate. Note, implication does not go the other way. (i.e. if coordinates are close, it does not mean nodes are on the same network.)
Method Detail

everyOtherBit

private static int everyOtherBit(IP_Address a,
                                 boolean evenBits)
This function converts the IP_Address to a long, and then creates an integer made from every other bit of the IP_Address. It is called by DT_LogicalAddress(IP_Address)

greaterThan

public boolean greaterThan(I_Address a)
Implements method of I_Address interface.

getSize

public int getSize()
Returns the size of byte[] used to store address.

toByteArray

public byte[] toByteArray()
Converts the object into a byte array for transfer in a message. This is the exact inverse of the constructor that takes a byte array.