Package com.singularsys.jep.misc.functions

Class FromBase

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.NaryFunction

com.singularsys.jep.misc.functions.FromBase

All Implemented Interfaces:

PostfixMathCommandI, Serializable

public class FromBase
extends NaryFunction

PostfixMathCommand which converts a string to a number in a given base. Instance of these classes can be specified with two different behaviours either with the base specified in the constructor or with no base specified in which case the function requires two arguments, the second of which is the base. A third form allows a prefix to be specified, this prefix must be present in the Jep expression.

For example

jep.addFunction("fromDec",new FromBase(10));
 jep.parse("fromDec(\"123.45\")");
 jep.addFunction("fromHex",new FromBase(16,"0x"));
 jep.parse("fromHex(\"0xff\")");
 jep.addFunction("fromBase",new FromBase());
 jep.parse("fromBase(\"0377\",8)");

Author:

Rich Morris Created on 02-May-2005

See Also:

• Serialized Form

Field Summary

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

curNumberOfParameters, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
FromBase()
FromBase(int base)
FromBase(int base, String prefix)

Method Summary

Modifier and Type	Method	Description
Object	eval(Object[] args)	Evaluate the function
Object	fromBase(String str, int base)

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

run

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

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

Methods inherited from class java.lang.Object

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

Constructor Details

FromBase

public FromBase()

FromBase

public FromBase(int base)

FromBase

public FromBase(int base,
 String prefix)

Method Details

eval

public Object eval(Object[] args)
            throws EvaluationException

Description copied from class: NaryFunction

Evaluate the function

Specified by:

eval in class NaryFunction

Parameters:

args - arguments to the function

Returns:

value returned by the function

Throws:

EvaluationException - if the calculation cannot be performed

fromBase

public Object fromBase(String str,
 int base)
                throws NumberFormatException

Throws:

NumberFormatException