universe.common.database
Class Index

java.lang.Object
  |
  +--universe.common.database.Index

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable

Direct Known Subclasses:

CivID, FleetID, GalaxyID, PlanetID, PlayerID, StationID, SystemID, WormholeID

public abstract class Index

extends java.lang.Object

implements java.io.Serializable, java.lang.Cloneable

This is the base class for all ID classes. All ID classes are used to access objects in the database.

Version:

$Id: Index.java,v 1.1 2001/07/03 04:07:52 sstarkey Exp $

Author:

Sean Starkey

See Also:

Serialized Form

Field Summary

private int

value The value of the ID.

Constructor Summary

protected

Index(int in) Used to create the Index object.

Method Summary

boolean	equals(java.lang.Object obj) This method compares two Index objects.
int	get() Returns the ID of this object.
int	hashCode() Use the index to hash these objects.
void	increment() Increments the ID of this object.
protected void	set(int in) Sets the ID of this object.
java.lang.String	toString() The String equivalent is just the ID number.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

value

private int value

The value of the ID.

Constructor Detail

Index

protected Index(int in)

Used to create the Index object. A unique ID should be used for each object (of the same type.)

Parameters:

in - ID for this object

Method Detail

get

public int get()

Returns the ID of this object.

Returns:

The ID.

set

protected void set(int in)

Sets the ID of this object.

Parameters:

in - The ID

increment

public void increment()

Increments the ID of this object. Useful in database classes that are keeping track of the next ID that can be allocated.

equals

public boolean equals(java.lang.Object obj)

This method compares two Index objects. It is important to realize that two Index of the same type with the same ID are equal. Two Index objects of different types with the same ID are not equal.

Overrides:

equals in class java.lang.Object

Parameters:

obj - Object to compare.

Returns:

Are these objects the same?

hashCode

public int hashCode()

Use the index to hash these objects. Makes sense since each ID is unique...

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

The String equivalent is just the ID number.

Overrides:

toString in class java.lang.Object