Class EmptyCollectionComparisonExpressionStateObject
- java.lang.Object
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- org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject
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- org.eclipse.persistence.jpa.jpql.tools.model.query.EmptyCollectionComparisonExpressionStateObject
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- All Implemented Interfaces:
StateObject
public class EmptyCollectionComparisonExpressionStateObject extends AbstractStateObject
This expression tests whether or not the collection designated by the collection-valued path expression is empty (i.e, has no elements).BNF:empty_collection_comparison_expression ::= collection_valued_path_expression IS [NOT] EMPTY
- Since:
- 2.4
- Version:
- 2.4
- Author:
- Pascal Filion
- See Also:
EmptyCollectionComparisonExpression
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Field Summary
Fields Modifier and Type Field Description static String
NOT_PROPERTY
Notifies the visibility of theNOT
identifier has changed.
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Constructor Summary
Constructors Constructor Description EmptyCollectionComparisonExpressionStateObject(StateObject parent)
Creates a newEmptyCollectionComparisonExpressionStateObject
.EmptyCollectionComparisonExpressionStateObject(StateObject parent, boolean not, String path)
Creates a newEmptyCollectionComparisonExpressionStateObject
.EmptyCollectionComparisonExpressionStateObject(StateObject parent, String path)
Creates a newEmptyCollectionComparisonExpressionStateObject
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
accept(StateObjectVisitor visitor)
Visits thisStateObject
by the givenvisitor
.EmptyCollectionComparisonExpressionStateObject
addNot()
Makes sure theNOT
identifier is specified.EmptyCollectionComparisonExpression
getExpression()
Returns the actual parsed object if thisStateObject
representation of the JPQL query was created by parsing an existing JPQL query.CollectionValuedPathExpressionStateObject
getStateObject()
Returns theCollectionValuedPathExpressionStateObject
representing the collection- valued path expression.boolean
hasNot()
Determines whether theNOT
identifier is used or not.boolean
isEquivalent(StateObject stateObject)
Determines whether the givenStateObject
is equivalent to this one, i.e.void
removeNot()
Makes sure theNOT
identifier is not specified.void
setExpression(EmptyCollectionComparisonExpression expression)
Keeps a reference of theparsed object
object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query intoStateObjects
.void
setNot(boolean not)
Sets whether theNOT
identifier should be part of the expression or not.void
toggleNot()
Changes the visibility state of theNOT
identifier.-
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
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Field Detail
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NOT_PROPERTY
public static String NOT_PROPERTY
Notifies the visibility of theNOT
identifier has changed.
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Constructor Detail
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EmptyCollectionComparisonExpressionStateObject
public EmptyCollectionComparisonExpressionStateObject(StateObject parent)
Creates a newEmptyCollectionComparisonExpressionStateObject
.- Parameters:
parent
- The parent of this state object, which cannot benull
- Throws:
NullPointerException
- The given parent cannot benull
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EmptyCollectionComparisonExpressionStateObject
public EmptyCollectionComparisonExpressionStateObject(StateObject parent, boolean not, String path)
Creates a newEmptyCollectionComparisonExpressionStateObject
.- Parameters:
parent
- The parent of this state object, which cannot benull
not
- Determines whether theNOT
identifier is part of the expression or notpath
- The collection-valued path expression- Throws:
NullPointerException
- The given parent cannot benull
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EmptyCollectionComparisonExpressionStateObject
public EmptyCollectionComparisonExpressionStateObject(StateObject parent, String path)
Creates a newEmptyCollectionComparisonExpressionStateObject
.- Parameters:
parent
- The parent of this state object, which cannot benull
path
- The collection-valued path expression- Throws:
NullPointerException
- The given parent cannot benull
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Method Detail
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accept
public void accept(StateObjectVisitor visitor)
Visits thisStateObject
by the givenvisitor
.- Parameters:
visitor
- Thevisitor
to visit this object
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addNot
public EmptyCollectionComparisonExpressionStateObject addNot()
Makes sure theNOT
identifier is specified.- Returns:
- This object
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getExpression
public EmptyCollectionComparisonExpression getExpression()
Returns the actual parsed object if thisStateObject
representation of the JPQL query was created by parsing an existing JPQL query.- Specified by:
getExpression
in interfaceStateObject
- Overrides:
getExpression
in classAbstractStateObject
- Returns:
- The parsed object when a JPQL query is parsed and converted into a
StateObject
ornull
when the JPQL query is manually created (i.e. not from a string)
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getStateObject
public CollectionValuedPathExpressionStateObject getStateObject()
Returns theCollectionValuedPathExpressionStateObject
representing the collection- valued path expression.- Returns:
- The
CollectionValuedPathExpressionStateObject
representing the collection- valued path expression, which is nevernull
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hasNot
public boolean hasNot()
Determines whether theNOT
identifier is used or not.- Returns:
true
if theNOT
identifier is part of the expression;false
otherwise
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isEquivalent
public boolean isEquivalent(StateObject stateObject)
Determines whether the givenStateObject
is equivalent to this one, i.e. the information of bothStateObject
is the same.- Specified by:
isEquivalent
in interfaceStateObject
- Overrides:
isEquivalent
in classAbstractStateObject
- Parameters:
stateObject
- TheStateObject
to compare its content to this one- Returns:
true
if both object are equivalent;false
otherwise
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removeNot
public void removeNot()
Makes sure theNOT
identifier is not specified.
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setExpression
public void setExpression(EmptyCollectionComparisonExpression expression)
Keeps a reference of theparsed object
object, which should only be done when this object is instantiated during the conversion of a parsed JPQL query intoStateObjects
.- Parameters:
expression
- Theparsed object
representing anEMPTY
expression
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setNot
public void setNot(boolean not)
Sets whether theNOT
identifier should be part of the expression or not.- Parameters:
not
-true
if theNOT
identifier should be part of the expression;false
otherwise
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toggleNot
public void toggleNot()
Changes the visibility state of theNOT
identifier.
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