com.singularsys.jep.misc.functions
Class FromBase

java.lang.Object
  com.singularsys.jep.functions.PostfixMathCommand
      com.singularsys.jep.misc.functions.FromBase

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable

public class FromBase
extends PostfixMathCommand

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

FromBase()

FromBase(int base)

FromBase(int base, java.lang.String prefix)

Method Summary

java.lang.Object	fromBase(java.lang.String str, int base)
void	run(java.util.Stack<java.lang.Object> s) Run the function on the stack.

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

Constructor Detail

FromBase

public FromBase()

FromBase

public FromBase(int base)

FromBase

public FromBase(int base,
                java.lang.String prefix)

Method Detail

run

public void run(java.util.Stack<java.lang.Object> s)
         throws EvaluationException

Description copied from interface: PostfixMathCommandI

Run the function on the stack. Pops the arguments from the stack, and pushes the result on the top of the stack.

Throws:

EvaluationException

fromBase

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

Throws:

java.lang.NumberFormatException