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

Class TreatExpressionStateObject

java.lang.Object

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

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

All Implemented Interfaces:

StateObject

public class TreatExpressionStateObject
extends AbstractStateObject

Returns an expression that allows to treat its base as if it were a subclass of the class returned by the base.

Note: EclipseLinkStateObjectVisitor needs to be used to traverse this state object.

BNF: join_treat ::= TREAT(collection_valued_path_expression [AS] entity_type_literal)

Version:

2.4

See Also:

TreatExpression

Author:

Pascal Filion

Since:

2.4

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	AS_PROPERTY Notifies the visibility of the AS identifier has changed.
static java.lang.String	ENTITY_TYPE_NAME_PROPERTY Notifies the entity type name property has changed.

Constructor Summary

Constructors

Constructor and Description
TreatExpressionStateObject(JoinStateObject parent) Creates a new TreatExpressionStateObject.
TreatExpressionStateObject(JoinStateObject parent, boolean as, java.lang.String entityTypeName) Creates a new TreatExpressionStateObject.
TreatExpressionStateObject(JoinStateObject parent, java.lang.String entityTypeName) Creates a new TreatExpressionStateObject.

Method Summary

Modifier and Type	Method and Description
void	accept(StateObjectVisitor visitor) Visits this StateObject by the given visitor.
TreatExpressionStateObject	addAs() Makes sure the AS identifier is specified.
protected void	addChildren(java.util.List<StateObject> children) Adds the children of this StateObject to the given list.
void	appendToEntityTypeName(java.lang.String text) Appends the given text to the existing entity type name property.
IEntity	getEntity() Resolves the entity type name to the external form of the actual IEntity.
java.lang.String	getEntityTypeName() Returns the name of the entity that is used to downcast the join association path.
TreatExpression	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
JoinStateObject	getJoin() Returns the reference of the JoinStateObject.
StateObject	getJoinAssociationIdentificationVariable() Returns the StateObject representing the identification variable that starts the path expression, which can be a sample identification variable, a map value, map key or map entry expression.
CollectionValuedPathExpressionStateObject	getJoinAssociationPathStateObject() Returns the CollectionValuedPathExpressionStateObject representing the join association path.
boolean	hasAs() Determines whether the AS identifier is used.
boolean	hasEntityTypeName() Determines whether the.
protected void	initialize() Initializes this state object.
boolean	isEquivalent(StateObject stateObject) Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.
void	removeAs() Makes sure the AS identifier is not specified.
void	setAs(boolean as) Sets whether the AS identifier should be used.
void	setEntityTypeName(java.lang.Class<?> entityType) Sets the name of the entity that is used to downcast the join association path.
void	setEntityTypeName(IEntity entityType) Sets the name of the entity that is used to downcast the join association path.
void	setEntityTypeName(java.lang.String entityTypeName) Sets the name of the entity that is used to downcast the join association path.
void	setExpression(TreatExpression 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	toggleAs() Toggles the visibility of the AS identifier; either adds it if it's not present otherwise removes it if it's present.
protected void	toTextInternal(java.lang.Appendable writer) Prints out a string representation of this StateObject, which should not be used to define a true string representation of a JPQL query but should be used for debugging purposes.

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

acceptUnknownVisitor, acceptUnknownVisitor, addProblems, addPropertyChangeListener, areEquivalent, buildProblem, buildProblem, buildStateObject, buildStateObjects, checkParent, children, decorate, equals, findIdentificationVariable, firePropertyChanged, getChangeSupport, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getParent, getQueryBuilder, getRoot, getType, getType, getTypeHelper, getTypeRepository, hashCode, isDecorated, parent, parent, parent, removePropertyChangeListener, setExpression, setParent, toString, toString, toStringInternal, toStringItems, toText

Methods inherited from class java.lang.Object

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

Field Detail

AS_PROPERTY

public static final java.lang.String AS_PROPERTY

Notifies the visibility of the AS identifier has changed.

See Also:

Constant Field Values

ENTITY_TYPE_NAME_PROPERTY

public static final java.lang.String ENTITY_TYPE_NAME_PROPERTY

Notifies the entity type name property has changed.

See Also:

Constant Field Values

Constructor Detail

TreatExpressionStateObject

public TreatExpressionStateObject(JoinStateObject parent)

Creates a new TreatExpressionStateObject.

Parameters:

parent - The parent of this state object, which is temporary since this state object will be parented with the state object representing the join's association path expression

TreatExpressionStateObject

public TreatExpressionStateObject(JoinStateObject parent,
                                  boolean as,
                                  java.lang.String entityTypeName)

Creates a new TreatExpressionStateObject.

Parameters:

parent - The parent of this state object, which is temporary since this state object will be parented with the state object representing the join's association path expression

as - Determines whether the AS identifier is used or not

entityTypeName - The entity type name used to cast the base expression

TreatExpressionStateObject

public TreatExpressionStateObject(JoinStateObject parent,
                                  java.lang.String entityTypeName)

Creates a new TreatExpressionStateObject.

Parameters:

parent - The parent of this state object, which is temporary since this state object will be parented with the state object representing the join's association path expression

entityTypeName - The entity type name used to cast the base expression

Method Detail

accept

public void accept(StateObjectVisitor visitor)

Visits this StateObject by the given visitor.

Parameters:

visitor - The visitor to visit this object

addAs

public TreatExpressionStateObject addAs()

Makes sure the AS identifier is specified.

Returns:

This object

addChildren

protected void addChildren(java.util.List<StateObject> children)

Adds the children of this StateObject to the given list.

Overrides:

addChildren in class AbstractStateObject

Parameters:

children - The list used to store the children

appendToEntityTypeName

public void appendToEntityTypeName(java.lang.String text)

Appends the given text to the existing entity type name property.

Parameters:

text - The text to append to the entity type name property or nothing is done if the given value is null

getEntity

public IEntity getEntity()

Resolves the entity type name to the external form of the actual IEntity.

Returns:

Either the IEntity with the same entity type name or null if the managed type provider does not have an entity with that name

getEntityTypeName

public java.lang.String getEntityTypeName()

Returns the name of the entity that is used to downcast the join association path.

Returns:

The name of the entity used for down casting

getExpression

public TreatExpression 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 AbstractStateObject

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)

getJoin

public JoinStateObject getJoin()

Returns the reference of the JoinStateObject.

Returns:

The "owning" of this object

getJoinAssociationIdentificationVariable

public StateObject getJoinAssociationIdentificationVariable()

Returns the StateObject representing the identification variable that starts the path expression, which can be a sample identification variable, a map value, map key or map entry expression.

Returns:

The root of the path expression

getJoinAssociationPathStateObject

public CollectionValuedPathExpressionStateObject getJoinAssociationPathStateObject()

Returns the CollectionValuedPathExpressionStateObject representing the join association path.

Returns:

The state object representing the join association path

hasAs

public boolean hasAs()

Determines whether the AS identifier is used.

Returns:

true if the AS identifier is used; false otherwise

hasEntityTypeName

public boolean hasEntityTypeName()

Determines whether the.

Returns:

true if the entity type name has been defined; false otherwise

initialize

protected void initialize()

Initializes this state object.

Overrides:

initialize in class AbstractStateObject

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 AbstractStateObject

Parameters:

stateObject - The StateObject to compare its content to this one

Returns:

true if both object are equivalent; false otherwise

removeAs

public void removeAs()

Makes sure the AS identifier is not specified.

setAs

public void setAs(boolean as)

Sets whether the AS identifier should be used.

Parameters:

as - true if the AS identifier should be used part; false otherwise

setEntityTypeName

public void setEntityTypeName(java.lang.Class<?> entityType)

Sets the name of the entity that is used to downcast the join association path.

Parameters:

entityType - The Java class representing the entity type

setEntityTypeName

public void setEntityTypeName(IEntity entityType)

Sets the name of the entity that is used to downcast the join association path.

Parameters:

entityType - The external form of the entity type

setEntityTypeName

public void setEntityTypeName(java.lang.String entityTypeName)

Sets the name of the entity that is used to downcast the join association path.

Parameters:

entityTypeName - The new name of the entity used for down casting

setExpression

public void setExpression(TreatExpression 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 the TREAD expression

toggleAs

public void toggleAs()

Toggles the visibility of the AS identifier; either adds it if it's not present otherwise removes it if it's present.

toTextInternal

protected void toTextInternal(java.lang.Appendable writer)
                       throws java.io.IOException

Prints out a string representation of this StateObject, which should not be used to define a true string representation of a JPQL query but should be used for debugging purposes.

Specified by:

toTextInternal in class AbstractStateObject

Parameters:

writer - The writer used to print out the string representation

Throws:

java.io.IOException - This should never happens, it is only required because Appendable is used instead of any concrete class