pl.edu.agh.cast.filter
Class HeadFilter

java.lang.Object
  pl.edu.agh.cast.filter.HeadFilter

All Implemented Interfaces:

IFilter

public class HeadFilter
extends Object
implements IFilter

Example filter - returns first N relations from data set.

number (single parameter) is the number of relations to be returned

Author:

AGH CAST Team

Constructor Summary

HeadFilter(String n)
Parametrized constructor.

Method Summary

Collection<IRelation>

filter(DataSet dataSet) Returns the head of the data set, i.e.

Methods inherited from class java.lang.Object

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

Constructor Detail

HeadFilter

public HeadFilter(String n)

Parametrized constructor.

Parameters:

n - The number of rows to be returned.

Method Detail

filter

public Collection<IRelation> filter(DataSet dataSet)

Returns the head of the data set, i.e. the first n relations.

Specified by:

filter in interface IFilter

Parameters:

dataSet - The data set to filter

Returns:

Collection of relations