Venice 0.751beta

nz.org.venice.parser.expression
Class RandomWithSeedExpression

java.lang.Object
  extended bynz.org.venice.parser.expression.AbstractExpression
      extended bynz.org.venice.parser.expression.UnaryExpression
          extended bynz.org.venice.parser.expression.RandomWithSeedExpression
All Implemented Interfaces:
java.lang.Cloneable, Expression

public class RandomWithSeedExpression
extends UnaryExpression

An expression which returns a random number.

Author:
Mark Hummel

Field Summary
 
Fields inherited from interface nz.org.venice.parser.Expression
BOOLEAN_TYPE, FALSE, FLOAT_QUOTE_TYPE, FLOAT_TYPE, INTEGER_QUOTE_TYPE, INTEGER_SHORT_TYPE, INTEGER_TYPE, NUMERIC_TYPE, STRING_TYPE, TRUE, TRUE_LEVEL, UNDEFINED_TYPE
 
Constructor Summary
RandomWithSeedExpression(Expression arg)
          Create a new random expression for the given seed
 
Method Summary
 int checkType()
          Check the optional input argument to the expression.
 java.lang.Object clone()
           
 double evaluate(Variables variables, QuoteBundle quoteBundle, Symbol symbol, int day)
          Evaluates the given expression and returns the result.
 int getType()
          Get the type of the expression
 java.lang.String toString()
          Return the name of the expression
 
Methods inherited from class nz.org.venice.parser.expression.UnaryExpression
getChildCount
 
Methods inherited from class nz.org.venice.parser.expression.AbstractExpression
equals, getChild, getId, getIndex, getNumberFormat, getParent, getParseMetadata, hashCode, isRoot, iterator, parseDouble, parseInt, printParents, setChild, setChildMutableVersion, setParent, setParseMetadata, simplify, simplifyMutableVersion, size, size, validTree, valueOfDouble, valueOfInt
 
Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

RandomWithSeedExpression

public RandomWithSeedExpression(Expression arg)
Create a new random expression for the given seed

Method Detail

evaluate

public double evaluate(Variables variables,
                       QuoteBundle quoteBundle,
                       Symbol symbol,
                       int day)
                throws EvaluationException
Description copied from interface: Expression
Evaluates the given expression and returns the result.

Parameters:
variables - variable storage area for expression
quoteBundle - the quote bundle containing quote data to use
symbol - the current symbol
day - current date in cache fast access format
Returns:
the result of the expression
Throws:
EvaluationException - if the expression performs an illegal operation such as divide by zero.

checkType

public int checkType()
              throws TypeMismatchException
Check the optional input argument to the expression. It can only be Expression.INTEGER_TYPE or Expression.FLOAT_TYPE

Returns:
the type of the expression
Throws:
TypeMismatchException - if the expression has incorrect types

toString

public java.lang.String toString()
Return the name of the expression. *

Specified by:
toString in interface Expression
Overrides:
toString in class AbstractExpression
Returns:
random()

getType

public int getType()
Get the type of the expression

Returns:
Expression.FLOAT_TYPE

clone

public java.lang.Object clone()
Specified by:
clone in interface Expression
Specified by:
clone in class AbstractExpression

Venice 0.751beta