com.singularsys.jep.functions
Class Comparative

java.lang.Object
  com.singularsys.jep.functions.PostfixMathCommand
      com.singularsys.jep.functions.BinaryFunction
          com.singularsys.jep.functions.Comparative

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable

Direct Known Subclasses:

NullSafeEquals

public class Comparative
extends BinaryFunction

Implements the comparative operations <, >, <=, >=, != and ==. The <, >, <=, >= operators only work on Double type, while the != and == operators also work on String and Vector arguments. For other types, care might be needed.

Complex numbers are compared using a tolerance which can be set using setTolerance().

Since:

2.3.0 beta 1 a bit of a rewrite to make sub classing easier, now allows Complex to be compared to Double i.e. 1+0 i == 1., 2.3.0 beta 2 changed the internal lt,gt,le,ge,ne and eq method to return boolean. If this breaks anything use if (lt(obj1,obj2)) inStack.push(new Double(1)); else inStack.push(new Double(0));

Author:

N Funk and R Morris

See Also:

Serialized Form

Field Summary

static int	EQ
static int	GE
static int	GT
protected int	id Used to represent which operator the class represents.
static int	LE
static int	LT
static int	NE

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Comparative(int id_in)
Constructor.

Comparative(int id, double tolerance)

Method Summary

boolean	compare(java.lang.Object param1, java.lang.Object param2)
boolean	eq(java.lang.Object param1, java.lang.Object param2)
java.lang.Object	eval(java.lang.Object l, java.lang.Object r)
boolean	ge(java.lang.Object param1, java.lang.Object param2)
double	getTolerance() Returns the tolerance used for comparing complex numbers
boolean	gt(java.lang.Object param1, java.lang.Object param2)
boolean	le(java.lang.Object param1, java.lang.Object param2)
boolean	lt(java.lang.Object param1, java.lang.Object param2)
boolean	ne(java.lang.Object param1, java.lang.Object param2)
void	setTolerance(double d) Sets the tolerance used for comparing complex numbers

Methods inherited from class com.singularsys.jep.functions.BinaryFunction

run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, checkStack, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString

Methods inherited from class java.lang.Object

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

Field Detail

id

protected final int id

Used to represent which operator the class represents.

LT

public static final int LT

See Also:

Constant Field Values

GT

public static final int GT

See Also:

Constant Field Values

LE

public static final int LE

See Also:

Constant Field Values

GE

public static final int GE

See Also:

Constant Field Values

NE

public static final int NE

See Also:

Constant Field Values

EQ

public static final int EQ

See Also:

Constant Field Values

Constructor Detail

Comparative

public Comparative(int id_in)

Constructor. Sets the number of parameters to 2. Initializes the tolerance for comparing Complex values.

Parameters:

id_in - The id of the comparative operator.

Comparative

public Comparative(int id,
                   double tolerance)

Parameters:

id -

tolerance - tolerance for comparing Complex values

Method Detail

eval

public java.lang.Object eval(java.lang.Object l,
                             java.lang.Object r)
                      throws EvaluationException

Specified by:

eval in class BinaryFunction

Throws:

EvaluationException

compare

public boolean compare(java.lang.Object param1,
                       java.lang.Object param2)
                throws EvaluationException

Throws:

EvaluationException

lt

public boolean lt(java.lang.Object param1,
                  java.lang.Object param2)
           throws EvaluationException

Throws:

EvaluationException

gt

public boolean gt(java.lang.Object param1,
                  java.lang.Object param2)
           throws EvaluationException

Throws:

EvaluationException

le

public boolean le(java.lang.Object param1,
                  java.lang.Object param2)
           throws EvaluationException

Throws:

EvaluationException

ge

public boolean ge(java.lang.Object param1,
                  java.lang.Object param2)
           throws EvaluationException

Throws:

EvaluationException

eq

public boolean eq(java.lang.Object param1,
                  java.lang.Object param2)
           throws EvaluationException

Throws:

EvaluationException

ne

public boolean ne(java.lang.Object param1,
                  java.lang.Object param2)
           throws EvaluationException

Throws:

EvaluationException

getTolerance

public double getTolerance()

Returns the tolerance used for comparing complex numbers

setTolerance

public void setTolerance(double d)

Sets the tolerance used for comparing complex numbers

Parameters:

d -