org.eclipse.persistence.jpa.jpql.tools.model.query

Class ExistsExpressionStateObject

java.lang.Object

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractEncapsulatedExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.ExistsExpressionStateObject

All Implemented Interfaces:

StateObject

public class ExistsExpressionStateObject
extends AbstractSingleEncapsulatedExpressionStateObject

An EXISTS expression is a predicate that is true only if the result of the subquery consists of one or more values and that is false otherwise.

BNF: exists_expression ::= [NOT] EXISTS(subquery)

Since:

2.4

Version:

2.4

Author:

Pascal Filion

See Also:

ExistsExpression

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	NOT_PROPERTY Notifies the visibility of the NOT identifier has changed.

Fields inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

STATE_OBJECT_PROPERTY

Constructor Summary

Constructors

Constructor and Description
ExistsExpressionStateObject(StateObject parent) Creates a new ExistsExpressionStateObject.
ExistsExpressionStateObject(StateObject parent, boolean not, StateObject stateObject) Creates a new ExistsExpressionStateObject.
ExistsExpressionStateObject(StateObject parent, boolean not, java.lang.String jpqlFragment) Creates a new ExistsExpressionStateObject.
ExistsExpressionStateObject(StateObject parent, StateObject stateObject) Creates a new ExistsExpressionStateObject.
ExistsExpressionStateObject(StateObject parent, java.lang.String jpqlFragment) Creates a new ExistsExpressionStateObject.

Method Summary

Modifier and Type	Method and Description
void	accept(StateObjectVisitor visitor) Visits this StateObject by the given visitor.
ExistsExpressionStateObject	addNot() Makes sure the NOT identifier is specified.
ExistsExpression	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
java.lang.String	getIdentifier() Returns the JPQL identifier of the expression represented by this AbstractSingleEncapsulatedExpressionStateObject.
boolean	hasNot() Determines whether the NOT identifier is used or not.
boolean	isEquivalent(StateObject stateObject) Determines whether the given StateObject is equivalent to this one, i.e.
void	removeNot() Makes sure the NOT identifier is not specified.
void	setExpression(ExistsExpression expression) Keeps a reference of the parsed object object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query into StateObjects.
void	setNot(boolean not) Sets whether the NOT identifier should be part of the expression or not.
void	setStateObject(StateObject stateObject) Sets the given StateObject to represent the new encapsulated expression.
void	toggleNot() Changes the visibility state of the NOT identifier.

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

getStateObject, hasStateObject, parse

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject

addPropertyChangeListener, children, decorate, equals, findIdentificationVariable, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getParent, getQueryBuilder, getRoot, getType, getType, getTypeHelper, getTypeRepository, hashCode, isDecorated, removePropertyChangeListener, setExpression, setParent, toString, toString, toText

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

NOT_PROPERTY

public static java.lang.String NOT_PROPERTY

Notifies the visibility of the NOT identifier has changed.

Constructor Detail

ExistsExpressionStateObject

public ExistsExpressionStateObject(StateObject parent)

Creates a new ExistsExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

Throws:

java.lang.NullPointerException - The given parent cannot be null

ExistsExpressionStateObject

public ExistsExpressionStateObject(StateObject parent,
                                   boolean not,
                                   StateObject stateObject)

Creates a new ExistsExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

not - Determines whether the NOT identifier is part of the expression or not

stateObject - The StateObject representing the subquery

Throws:

java.lang.NullPointerException - The given parent cannot be null

ExistsExpressionStateObject

public ExistsExpressionStateObject(StateObject parent,
                                   boolean not,
                                   java.lang.String jpqlFragment)

Creates a new ExistsExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

not - Determines whether the NOT identifier is part of the expression or not

jpqlFragment - The portion of the query representing the encapsulated expression

Throws:

java.lang.NullPointerException - The given parent cannot be null

ExistsExpressionStateObject

public ExistsExpressionStateObject(StateObject parent,
                                   StateObject stateObject)

Creates a new ExistsExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

stateObject - The StateObject representing the subquery

Throws:

java.lang.NullPointerException - The given parent cannot be null

ExistsExpressionStateObject

public ExistsExpressionStateObject(StateObject parent,
                                   java.lang.String jpqlFragment)

Creates a new ExistsExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

jpqlFragment - The portion of the query representing the encapsulated expression

Throws:

java.lang.NullPointerException - The given parent cannot be null

Method Detail

accept

public void accept(StateObjectVisitor visitor)

Visits this StateObject by the given visitor.

Parameters:

visitor - The visitor to visit this object

addNot

public ExistsExpressionStateObject addNot()

Makes sure the NOT identifier is specified.

Returns:

This object

getExpression

public ExistsExpression getExpression()

Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.

Specified by:

getExpression in interface StateObject

Overrides:

getExpression in class AbstractSingleEncapsulatedExpressionStateObject

Returns:

The parsed object when a JPQL query is parsed and converted into a StateObject or null when the JPQL query is manually created (i.e. not from a string)

getIdentifier

public java.lang.String getIdentifier()

Returns the JPQL identifier of the expression represented by this AbstractSingleEncapsulatedExpressionStateObject.

Specified by:

getIdentifier in class AbstractEncapsulatedExpressionStateObject

Returns:

The JPQL identifier that is shown before the left parenthesis

hasNot

public boolean hasNot()

Determines whether the NOT identifier is used or not.

Returns:

true if the NOT identifier is part of the expression; false otherwise

isEquivalent

public boolean isEquivalent(StateObject stateObject)

Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.

Specified by:

isEquivalent in interface StateObject

Overrides:

isEquivalent in class AbstractSingleEncapsulatedExpressionStateObject

Parameters:

stateObject - The StateObject to compare its content to this one

Returns:

true if both object are equivalent; false otherwise

removeNot

public void removeNot()

Makes sure the NOT identifier is not specified.

setExpression

public void setExpression(ExistsExpression expression)

Keeps a reference of the parsed object object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query into StateObjects.

Parameters:

expression - The parsed object representing an EXISTS expression

setNot

public void setNot(boolean not)

Sets whether the NOT identifier should be part of the expression or not.

Parameters:

not - true if the NOT identifier should be part of the expression; false otherwise

setStateObject

public void setStateObject(StateObject stateObject)

Sets the given StateObject to represent the new encapsulated expression.

Parameters:

stateObject - The new encapsulated StateObject

toggleNot

public void toggleNot()

Changes the visibility state of the NOT identifier.