nz.org.venice.parser.expression
Class EqualThanExpression

java.lang.Object
  nz.org.venice.parser.expression.AbstractExpression
      nz.org.venice.parser.expression.BinaryExpression
          nz.org.venice.parser.expression.ComparisionExpression
              nz.org.venice.parser.expression.EqualThanExpression

All Implemented Interfaces:

java.lang.Cloneable, Expression

public class EqualThanExpression

extends ComparisionExpression

An expression which compares the two sub-expressions for equality.

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

EqualThanExpression(Expression left, Expression right)

Method Summary

java.lang.Object	clone()
boolean	equals(java.lang.Object object) Returns whether this expression tree and the given expression tree are equivalent.
double	evaluate(Variables variables, QuoteBundle quoteBundle, Symbol symbol, int day) Evaluates the given expression and returns the result.
int	hashCode() If you override the equals(java.lang.Object) method then you should override this method.
Expression	simplify() Perform simplifications and optimisations on the expression tree.
java.lang.String	toString() Convert the given expression to a string.

Methods inherited from class nz.org.venice.parser.expression.ComparisionExpression

checkType, getType

Methods inherited from class nz.org.venice.parser.expression.BinaryExpression

getChildCount, toString

Methods inherited from class nz.org.venice.parser.expression.AbstractExpression

getChild, getId, getIndex, getNumberFormat, getParent, getParseMetadata, isRoot, iterator, parseDouble, parseInt, printParents, setChild, setChildMutableVersion, setParent, setParseMetadata, simplifyMutableVersion, size, size, validTree, valueOfDouble, valueOfInt

Methods inherited from class java.lang.Object

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

Constructor Detail

EqualThanExpression

public EqualThanExpression(Expression left,
                           Expression right)

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.

simplify

public Expression simplify()

Description copied from class: AbstractExpression

Perform simplifications and optimisations on the expression tree. For example, if the expression tree was a and true then the expression tree would be simplified to a.

Specified by:

simplify in interface Expression

Overrides:

simplify in class ComparisionExpression

equals

public boolean equals(java.lang.Object object)

Description copied from class: AbstractExpression

Returns whether this expression tree and the given expression tree are equivalent.

Specified by:

equals in interface Expression

Overrides:

equals in class AbstractExpression

Parameters:

object - the other expression

hashCode

public int hashCode()

Description copied from class: AbstractExpression

If you override the AbstractExpression.equals(java.lang.Object) method then you should override this method. It provides a very basic hash code function.

Specified by:

hashCode in interface Expression

Overrides:

hashCode in class AbstractExpression

Returns:

a poor hash code of the tree

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 AbstractExpression

clone

public java.lang.Object clone()

Specified by:

clone in interface Expression

Specified by:

clone in class AbstractExpression