com.klg.jclass.util.formulae
Class Count

java.lang.Object
  |
  +--com.klg.jclass.util.formulae.Operation
        |
        +--com.klg.jclass.util.formulae.Count

All Implemented Interfaces:

Cloneable, Expression

public class Count

extends Operation

This is a concrete implementation for the count operation. Count determines the total number of elements across its operands.

Field Summary

Fields inherited from class com.klg.jclass.util.formulae.Operation

leftOperand, rightOperand

Constructor Summary

Count(com.klg.jclass.util.formulae.Expression operand)
Count the given operand (usually a list of expressions)

Count(com.klg.jclass.util.formulae.Expression operand1, com.klg.jclass.util.formulae.Expression operand2)
Count a pair of operands

Method Summary

com.klg.jclass.util.formulae.Result

evaluate() Return the result of counting the operands

Methods inherited from class com.klg.jclass.util.formulae.Operation

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

Count

public Count(com.klg.jclass.util.formulae.Expression operand)

Count the given operand (usually a list of expressions)

Count

public Count(com.klg.jclass.util.formulae.Expression operand1,
             com.klg.jclass.util.formulae.Expression operand2)

Count a pair of operands

Method Detail

evaluate

public com.klg.jclass.util.formulae.Result evaluate()

Return the result of counting the operands

Specified by:

evaluate in interface Expression

Specified by:

evaluate in class Operation

Returns:

The count of the number of elements in the operands