com.sptci.prevayler.query
Class Count<S extends PrevalentSystem>

java.lang.Object
  com.sptci.prevayler.query.AbstractQuery<Integer,S>
      com.sptci.prevayler.query.Count<S>

All Implemented Interfaces:

Query

public class Count<S extends PrevalentSystem>
extends AbstractQuery<Integer,S>

The query for retrieving the total number of objects of the specified type in the prevalent system.

Version:

$Id: Count.java 18 2008-07-20 03:35:47Z sptrakesh $

Author:

Rakesh Vidyadharan 2008-05-27

See Also:

© Copyright 2008 Sans Pareil Technologies, Inc.

Field Summary

private Class

cls The type of object whose total count is required.

Constructor Summary

Count(Class cls)
Create a new instance of the query for the specified prevalent object type.

Method Summary

protected Integer

query(S system, Date timestamp) Execute the query on the prevalent system and return the total number of objects of cls in the system.

Methods inherited from class com.sptci.prevayler.query.AbstractQuery

query

Methods inherited from class java.lang.Object

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

Field Detail

cls

private final Class cls

The type of object whose total count is required.

Constructor Detail

Count

public Count(Class cls)

Create a new instance of the query for the specified prevalent object type.

Parameters:

cls - The cls value to use.

Method Detail

query

protected Integer query(S system,
                        Date timestamp)

Execute the query on the prevalent system and return the total number of objects of cls in the system.

Specified by:

query in class AbstractQuery<Integer,S extends PrevalentSystem>

Parameters:

system - The prevalent system that is to be acted upon.

timestamp - The timestamp for the query.

Returns:

The count of prevalent objects of cls in the system.