org.teiid.query.sql.lang

Class ExistsCriteria

java.lang.Object

org.teiid.query.sql.lang.Criteria

org.teiid.query.sql.lang.PredicateCriteria

org.teiid.query.sql.lang.ExistsCriteria

All Implemented Interfaces:

Cloneable, PredicateCriteria.Negatable, SubqueryContainer<QueryCommand>, SubqueryContainer.Evaluatable<QueryCommand>, LanguageObject, ContextReference, Expression

public class ExistsCriteria
extends PredicateCriteria
implements SubqueryContainer.Evaluatable<QueryCommand>, ContextReference, PredicateCriteria.Negatable

This predicate criteria implements the "exists" predicate, which has a subquery in it. For example, "EXISTS (Select EmployeeID FROM Employees WHERE EmployeeName = 'Smith')".

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExistsCriteria.SubqueryHint

Nested classes/interfaces inherited from class org.teiid.query.sql.lang.PredicateCriteria

PredicateCriteria.Negatable

Nested classes/interfaces inherited from interface org.teiid.query.sql.lang.SubqueryContainer

SubqueryContainer.Evaluatable<T extends Command>

Nested classes/interfaces inherited from interface org.teiid.query.sql.LanguageObject

LanguageObject.Util

Constructor Summary

Constructors

Constructor and Description
ExistsCriteria() Default constructor
ExistsCriteria(QueryCommand subqueryCommand)

Method Summary

Modifier and Type	Method and Description
void	acceptVisitor(LanguageVisitor visitor) Method for accepting a visitor.
Object	clone() Deep copy of object.
boolean	equals(Object obj) Override equals() method.
QueryCommand	getCommand() Returns the subquery Command object
String	getContextSymbol()
ExistsCriteria.SubqueryHint	getSubqueryHint()
int	hashCode() Get hash code.
boolean	isNegated()
void	negate()
void	setCommand(QueryCommand subqueryCommand) Sets the subquery Command object
void	setNegated(boolean negated)
void	setShouldEvaluate(boolean shouldEvaluate)
void	setSubqueryHint(ExistsCriteria.SubqueryHint subqueryHint)
boolean	shouldEvaluate()

Methods inherited from class org.teiid.query.sql.lang.Criteria

applyDemorgan, combineCriteria, combineCriteria, combineCriteria, getType, separateCriteriaByAnd, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

ExistsCriteria

public ExistsCriteria()

Default constructor

ExistsCriteria

public ExistsCriteria(QueryCommand subqueryCommand)

Method Detail

shouldEvaluate

public boolean shouldEvaluate()

Specified by:

shouldEvaluate in interface SubqueryContainer.Evaluatable<QueryCommand>

setShouldEvaluate

public void setShouldEvaluate(boolean shouldEvaluate)

Specified by:

setShouldEvaluate in interface SubqueryContainer.Evaluatable<QueryCommand>

getContextSymbol

public String getContextSymbol()

Specified by:

getContextSymbol in interface ContextReference

getCommand

public QueryCommand getCommand()

Description copied from interface: SubqueryContainer

Returns the subquery Command object

Specified by:

getCommand in interface SubqueryContainer<QueryCommand>

Returns:

the subquery Command object

setCommand

public void setCommand(QueryCommand subqueryCommand)

Description copied from interface: SubqueryContainer

Sets the subquery Command object

Specified by:

setCommand in interface SubqueryContainer<QueryCommand>

Parameters:

subqueryCommand - the subquery Command object

acceptVisitor

public void acceptVisitor(LanguageVisitor visitor)

Description copied from interface: LanguageObject

Method for accepting a visitor. It is the responsibility of the language object to call back on the visitor.

Specified by:

acceptVisitor in interface LanguageObject

Parameters:

visitor - Visitor being used

hashCode

public int hashCode()

Get hash code. WARNING: The hash code is based on data in the criteria. If data values are changed, the hash code will change - don't hash this object and change values.

Overrides:

hashCode in class Object

Returns:

Hash code

equals

public boolean equals(Object obj)

Override equals() method.

Overrides:

equals in class Object

Parameters:

obj - Other object

Returns:

True if equal

getSubqueryHint

public ExistsCriteria.SubqueryHint getSubqueryHint()

setSubqueryHint

public void setSubqueryHint(ExistsCriteria.SubqueryHint subqueryHint)

clone

public Object clone()

Deep copy of object. The values Iterator of this object will not be cloned - it will be null in the new object (see #setValueIterator setValueIterator}).

Specified by:

clone in interface LanguageObject

Specified by:

clone in class PredicateCriteria

Returns:

Deep copy of object

See Also:

Object.clone()

isNegated

public boolean isNegated()

setNegated

public void setNegated(boolean negated)

negate

public void negate()

Specified by:

negate in interface PredicateCriteria.Negatable