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com.clra.rowing
Class RowingSessionSnapshot  

java.lang.Object
  com.clra.rowing.RowingSessionSnapshot

All Implemented Interfaces:

java.lang.Comparable, java.io.Serializable

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public class RowingSessionSnapshot

extends java.lang.Object

implements java.lang.Comparable, java.io.Serializable

A snapshot of the data held by rowing session. If more than one property of a rowing session needs to be read or written, it may be more efficient to read or write all properties, in order to minimize network transit times.

Version:

$Revision: 1.3 $ $Date: 2003/02/26 03:38:45 $

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Field Summary
private  java.util.Date	date
private  int	hashCode
private  java.lang.Integer	id
private  RowingSessionLevel	level
private  RowingSessionState	state
private  RowingSessionType	type

 

Constructor Summary

RowingSessionSnapshot(java.lang.Integer id, RowingSessionState st, java.util.Date dt, RowingSessionLevel lv, RowingSessionType tp)

 

Method Summary
int	compareTo(java.lang.Object o)           Compares this object with another, and returns a numerical result based on the comparison.
java.util.Date	getDate()           Returns the date (and time) of a rowing session
java.lang.Integer	getId()           Returns the primary key of a rowing session.
RowingSessionLevel	getLevel()           Returns the level of a rowing session
RowingSessionState	getState()           Returns the state of a rowing session.
RowingSessionType	getType()           Returns the type of a rowing session
int	hashCode()           Get a value that represents this Object, as uniquely as possible within the confines of an int.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

id

private java.lang.Integer id

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date

private java.util.Date date

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state

private RowingSessionState state

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level

private RowingSessionLevel level

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type

private RowingSessionType type

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hashCode

private int hashCode

Constructor Detail

RowingSessionSnapshot

public RowingSessionSnapshot(java.lang.Integer id,
                             RowingSessionState st,
                             java.util.Date dt,
                             RowingSessionLevel lv,
                             RowingSessionType tp)

Method Detail

getId

public java.lang.Integer getId()

Returns the primary key of a rowing session. The id is immutable after a rowing session is created.

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getState

public RowingSessionState getState()

Returns the state of a rowing session. The state of a rowing session can not be set directly. It is changed as a side-effect of other operations on a rowing session.

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getDate

public java.util.Date getDate()

Returns the date (and time) of a rowing session

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getLevel

public RowingSessionLevel getLevel()

Returns the level of a rowing session

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getType

public RowingSessionType getType()

Returns the type of a rowing session

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compareTo

public int compareTo(java.lang.Object o)

Description copied from interface: java.lang.Comparable

Compares this object with another, and returns a numerical result based on the comparison. If the result is negative, this object sorts less than the other; if 0, the two are equal, and if positive, this object sorts greater than the other. To translate this into boolean, simply perform o1.compareTo(o2) <op> 0, where op is one of <, <=, =, !=, >, or >=.

You must make sure that the comparison is mutual, ie. sgn(x.compareTo(y)) == -sgn(y.compareTo(x)) (where sgn() is defined as -1, 0, or 1 based on the sign). This includes throwing an exception in either direction if the two are not comparable; hence, compareTo(null) should always throw an Exception.

You should also ensure transitivity, in two forms: x.compareTo(y) > 0 && y.compareTo(z) > 0 implies x.compareTo(z) > 0; and x.compareTo(y) == 0 implies x.compareTo(z) == y.compareTo(z).

Specified by:

compareTo in interface java.lang.Comparable

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hashCode

public int hashCode()

Description copied from class: java.lang.Object

Get a value that represents this Object, as uniquely as possible within the confines of an int.

There are some requirements on this method which subclasses must follow:

• Semantic equality implies identical hashcodes. In other words, if a.equals(b) is true, then a.hashCode() == b.hashCode() must be as well. However, the reverse is not necessarily true, and two objects may have the same hashcode without being equal.
• It must be consistent. Whichever value o.hashCode() returns on the first invocation must be the value returned on all later invocations as long as the object exists. Notice, however, that the result of hashCode may change between separate executions of a Virtual Machine, because it is not invoked on the same object.

Notice that since hashCode is used in java.util.Hashtable and other hashing classes, a poor implementation will degrade the performance of hashing (so don't blindly implement it as returning a constant!). Also, if calculating the hash is time-consuming, a class may consider caching the results.

The default implementation returns System.identityHashCode(this)

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