org.expressionj.expr

Class ExprSQRT

java.lang.Object

org.expressionj.model.AbstractExpression

org.expressionj.expr.AbstractUnaryExpression

org.expressionj.expr.ExprSQRT

All Implemented Interfaces:

java.lang.Cloneable, Expression, ExpressionType, UnaryExpression

public class ExprSQRT
extends AbstractUnaryExpression

Represent a "sqrt" expression.

Field Summary

Fields inherited from class org.expressionj.expr.AbstractUnaryExpression

expr

Fields inherited from class org.expressionj.model.AbstractExpression

block, root

Fields inherited from interface org.expressionj.model.ExpressionType

STRUCT_ARRAY, STRUCT_SCALAR, STRUCT_STRUCTURE, TYPE_BOOL, TYPE_DYNAMIC, TYPE_FLOAT, TYPE_INTEGER, TYPE_NUMERIC, TYPE_STRING, TYPE_UNDEF

Constructor Summary

Constructors

Constructor and Description
ExprSQRT(Expression root)

Method Summary

Modifier and Type	Method and Description
java.lang.Object	clone()
java.lang.Object	eval() Evaluate the expression.
float	evalAsFloat() Evaluate the expression as a float.
Expression	getExpression() Return the associated expression.
java.lang.String	getExpressionName() Return the expression name.
short	getResultStructure() Return the structure of the result for the expression.
short	getResultType() Return the type of the result for the expression.
void	setExpression(Expression expr)

Methods inherited from class org.expressionj.expr.AbstractUnaryExpression

getVariables

Methods inherited from class org.expressionj.model.AbstractExpression

evalAsBoolean, evalAsInt, getParentBlock, getRoot, setParentBlock, setRoot

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.expressionj.model.Expression

evalAsBoolean, evalAsInt, getLocalVariable, getLocalVariables, getParentBlock, getRoot, getVariable, getVariable, getVariables, hasVariable, hasVariable, removeVariable, setParentBlock

Constructor Detail

ExprSQRT

public ExprSQRT(Expression root)

Method Detail

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Specified by:

clone in interface Expression

Specified by:

clone in class AbstractExpression

Throws:

java.lang.CloneNotSupportedException

getExpressionName

public java.lang.String getExpressionName()

Description copied from interface: Expression

Return the expression name.

Returns:

the expression name

setExpression

public void setExpression(Expression expr)

getExpression

public Expression getExpression()

Description copied from interface: Expression

Return the associated expression. Return this by default.

Returns:

the associated expression

evalAsFloat

public float evalAsFloat()

Description copied from interface: Expression

Evaluate the expression as a float. The result of the evaluation will be the same as Expression.eval(), but the evaluation engine will be able to optimize the computation by knwoing that the result is a float (primitive valeus are cached internally).

Specified by:

evalAsFloat in interface Expression

Overrides:

evalAsFloat in class AbstractExpression

Returns:

the result as a float

eval

public java.lang.Object eval()
                      throws java.lang.ArithmeticException

Description copied from interface: Expression

Evaluate the expression.

Returns:

the result

Throws:

java.lang.ArithmeticException

getResultType

public short getResultType()

Description copied from interface: Expression

Return the type of the result for the expression. The type can be:

• ExpressionType.TYPE_INTEGER: integer
• ExpressionType.TYPE_FLOAT: float
• ExpressionType.TYPE_NUMERIC: integer or float value. The runtime actual type may depend on the expression arguments
• ExpressionType.TYPE_STRING: string
• ExpressionType.TYPE_DYNAMIC: dynamic type. The runtime actual type may depend on the expression arguments
• ExpressionType.TYPE_UNDEF: undefined type. The default type, characteristic of an error if entountered.

Returns:

the type of the result for the expression

getResultStructure

public short getResultStructure()

Description copied from interface: Expression

Return the structure of the result for the expression. The structure can be:

• ExpressionType.STRUCT_SCALAR: a scalar value
• ExpressionType.STRUCT_ARRAY: an array value

Returns:

he structure of the result for the expression