org.mov.parser.expression
Class WhileExpression

java.lang.Object
  org.mov.parser.expression.AbstractExpression
      org.mov.parser.expression.BinaryExpression
          org.mov.parser.expression.WhileExpression

All Implemented Interfaces:

java.lang.Cloneable, Expression

public class WhileExpression
extends BinaryExpression

An expression which represents the while command. e.g.

while(i++ < 10) {
   a += i;
}

Field Summary

Fields inherited from interface org.mov.parser.Expression

BOOLEAN_TYPE, FALSE, FLOAT_QUOTE_TYPE, FLOAT_TYPE, INTEGER_QUOTE_TYPE, INTEGER_TYPE, STRING_TYPE, TRUE, TRUE_LEVEL

Constructor Summary

WhileExpression(Expression condition, Expression command)
Construct a while expression.

Method Summary

int	checkType() Check the input arguments 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() Convert the given expression to a string.

Methods inherited from class org.mov.parser.expression.BinaryExpression

getChildCount, toString

Methods inherited from class org.mov.parser.expression.AbstractExpression

equals, getChild, getIndex, getNumberFormat, getParent, hashCode, isRoot, iterator, parseDouble, parseInt, setChild, setParent, simplify, size, size, valueOfDouble, valueOfInt

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

WhileExpression

public WhileExpression(Expression condition,
                       Expression command)

Construct a while expression.

while(condition) {
   command
}

Parameters:

condition - loop condition test.

command - the command to loop.

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.

toString

public java.lang.String toString()

Description copied from interface: Expression

Convert the given expression to a string.

Specified by:

toString in interface Expression

Overrides:

toString in class java.lang.Object

Returns:

the string representation of the expression

checkType

public int checkType()
              throws TypeMismatchException

Check the input arguments to the expression. The arguments can be any type except for the condition argument which must be Expression.BOOLEAN_TYPE.

Returns:

the type of the command argument.

Throws:

TypeMismatchException - if the expression has incorrect types

getType

public int getType()

Get the type of the expression.

Returns:

the type of the command argument.

clone

public java.lang.Object clone()

Specified by:

clone in interface Expression

Specified by:

clone in class AbstractExpression