*** This class is subject to change. ***

com.sas.iquery.metadata.expr
Class ConditionalExpression

com.sas.iquery.metadata.expr.ConditionalExpression

All Implemented Interfaces:

Base, BusinessModelResourceReferencer, ModelItem, UsabilityInterface, ExpressionInterface, PropertyChangeListenee, java.beans.PropertyChangeListener, java.lang.Cloneable, java.util.EventListener

Direct Known Subclasses:

BaseFilterExpression, CompoundConditionalExpression, DataBasedFilterExpression_Between, MultipleConditionalExpression, RelationalConditionalExpression

public abstract class ConditionalExpression

Specifies the abstract base class for all conditional expression classes. Conditional expressions model expressions evaluating to a boolean expression type. Conditional expressions are modeled in 3 basic ways.

1. Using one of the SimpleConditionalExpression_* classes - these classes model one of the ten or so types of simple conditional expressions, as laid out by SQL and shown below.
2. Using the CompoundConditionalExpression class - this class models the ability to construct compound expressions with tied together with ANDs and ORs.
3. Using the StringExpression class - to catch all other conditional expressions not modeled in any other way.

Field Summary

static java.lang.String

EVENT_NEGATION_CHANGED The event thrown when the negation attribute has changed values.

Fields inherited from interface com.sas.iquery.metadata.business.ModelItem

EVENT_OBJECT_PROPERTY_CHANGED

Fields inherited from interface com.sas.iquery.metadata.business.Base

EVENT_OBJECT_DEFINITION_CHANGED

Constructor Summary

ConditionalExpression()

Method Summary

int	getExpressionType() Always returns ExpressionTypes.EXP_TYPE_BOOLEAN
boolean	isNegated() Returns whether this conditional expression is negated.
void	setIsNegated(boolean flag) Sets whether this conditional expression is negated.

Methods inherited from interface com.sas.iquery.metadata.business.BusinessModelResourceReferencer

getResources

Methods inherited from interface com.sas.iquery.metadata.PropertyChangeListenee

addListener, getListeners, removeListener

Methods inherited from interface com.sas.iquery.metadata.business.UsabilityInterface

getReasonsUnusable, isUsableInQuery

Field Detail

*** This field is subject to change. ***

EVENT_NEGATION_CHANGED

public static final java.lang.String EVENT_NEGATION_CHANGED

The event thrown when the negation attribute has changed values.

See Also:

Constant Field Values

Constructor Detail

ConditionalExpression

public ConditionalExpression()

Method Detail

*** This method is subject to change. ***

isNegated

public boolean isNegated()

Returns whether this conditional expression is negated.

Returns:

whether this conditional expression is negated

*** This method is subject to change. ***

setIsNegated

public void setIsNegated(boolean flag)

Sets whether this conditional expression is negated.

Parameters:

flag - boolean indicating if this expression is negated

*** This method is subject to change. ***

getExpressionType

public int getExpressionType()

Always returns ExpressionTypes.EXP_TYPE_BOOLEAN

Returns:

the expression type (ExpressionTypes.EXP_TYPE_BOOLEAN in this case).

*** This class is subject to change. ***