org.mov.parser.expression
Class ClauseExpression

java.lang.Object
  org.mov.parser.expression.AbstractExpression
      org.mov.parser.expression.ClauseExpression

All Implemented Interfaces:

java.lang.Cloneable, Expression

public class ClauseExpression
extends AbstractExpression

A clause is an ordered list of sub-expressions. Each sub-expression is executed serially. The value and type of the clause is the value and type of the last sub-expression in the clause.

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

ClauseExpression(java.util.List children)
Create a new clause expression from the given list of expressions.

Method Summary

int	checkType() Perform type checking on 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	getChildCount() Return the number of children in the clause.
int	getType() Get the type of the expression.
java.lang.String	toString() Convert the given expression to a string.
static java.lang.String	toString(Expression expression) A helper method to use when printing expressions that might be either sub-expressions or clause expressions.

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

ClauseExpression

public ClauseExpression(java.util.List children)

Create a new clause expression from the given list of expressions.

Parameters:

children - list of expressions.

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 static java.lang.String toString(Expression expression)

A helper method to use when printing expressions that might be either sub-expressions or clause expressions. For example the "if" expression, ignoring the else clause, could be printed in two ways:

  if(x) {
     statement1
     statement2
     ...
  }
 

or

  if(x)
     statement

 

Which one will depend on whether the expression is a clause or a sub-expression. This function analyses the given expression and makes sure it is printed correctly.

Parameters:

expression - the expression to print.

Returns:

string representation.

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

Description copied from interface: Expression

Perform type checking on the expression.

Returns:

the return type of the expression

Throws:

TypeMismatchException - if the expression has incorrect types

getType

public int getType()

Description copied from interface: Expression

Get the type of the expression.

Returns:

one of Expression.BOOLEAN_TYPE, Expression.FLOAT_TYPE, Expression.INTEGER_TYPE, Expression.FLOAT_QUOTE_TYPE or Expression.INTEGER_QUOTE_TYPE.

getChildCount

public int getChildCount()

Return the number of children in the clause. This is the number of sub-expressions.

Returns:

the number of sub-expressions.

clone

public java.lang.Object clone()

Specified by:

clone in interface Expression

Specified by:

clone in class AbstractExpression