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- Version:
- 2.4
- See Also:
EmptyCollectionComparisonExpression- Author:
- Pascal Filion
- Since:
- 2.4
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Field Summary
Fields Modifier and Type Field Description static java.lang.StringNOT_PROPERTYNotifies the visibility of theNOTidentifier has changed.
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Constructor Summary
Constructors Constructor Description EmptyCollectionComparisonExpressionStateObject(StateObject parent)Creates a newEmptyCollectionComparisonExpressionStateObject.EmptyCollectionComparisonExpressionStateObject(StateObject parent, boolean not, java.lang.String path)Creates a newEmptyCollectionComparisonExpressionStateObject.EmptyCollectionComparisonExpressionStateObject(StateObject parent, java.lang.String path)Creates a newEmptyCollectionComparisonExpressionStateObject.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description voidaccept(StateObjectVisitor visitor)Visits thisStateObjectby the givenvisitor.protected voidaddChildren(java.util.List<StateObject> children)Adds the children of thisStateObjectto the given list.EmptyCollectionComparisonExpressionStateObjectaddNot()Makes sure theNOTidentifier is specified.EmptyCollectionComparisonExpressiongetExpression()Returns the actual parsed object if thisStateObjectrepresentation of the JPQL query was created by parsing an existing JPQL query.CollectionValuedPathExpressionStateObjectgetStateObject()Returns theCollectionValuedPathExpressionStateObjectrepresenting the collection- valued path expression.booleanhasNot()Determines whether theNOTidentifier is used or not.protected voidinitialize()Initializes this state object.booleanisEquivalent(StateObject stateObject)Determines whether the givenStateObjectis equivalent to this one, i.e. the information of bothStateObjectis the same.voidremoveNot()Makes sure theNOTidentifier is not specified.voidsetExpression(EmptyCollectionComparisonExpression expression)Keeps a reference of theparsed objectobject, which should only be done when this object is instantiated during the conversion of a parsed JPQL query intoStateObjects.voidsetNot(boolean not)Sets whether theNOTidentifier should be part of the expression or not.voidtoggleNot()Changes the visibility state of theNOTidentifier.protected voidtoTextInternal(java.lang.Appendable writer)Prints out a string representation of thisStateObject, which should not be used to define atruestring 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
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Field Detail
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NOT_PROPERTY
public static final java.lang.String NOT_PROPERTY
Notifies the visibility of theNOTidentifier has changed.- See Also:
- Constant Field Values
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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:
java.lang.NullPointerException- The given parent cannot benull
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EmptyCollectionComparisonExpressionStateObject
public EmptyCollectionComparisonExpressionStateObject(StateObject parent, boolean not, java.lang.String path)
Creates a newEmptyCollectionComparisonExpressionStateObject.- Parameters:
parent- The parent of this state object, which cannot benullnot- Determines whether theNOTidentifier is part of the expression or notpath- The collection-valued path expression- Throws:
java.lang.NullPointerException- The given parent cannot benull
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EmptyCollectionComparisonExpressionStateObject
public EmptyCollectionComparisonExpressionStateObject(StateObject parent, java.lang.String path)
Creates a newEmptyCollectionComparisonExpressionStateObject.- Parameters:
parent- The parent of this state object, which cannot benullpath- The collection-valued path expression- Throws:
java.lang.NullPointerException- The given parent cannot benull
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Method Detail
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accept
public void accept(StateObjectVisitor visitor)
Visits thisStateObjectby the givenvisitor.- Parameters:
visitor- Thevisitorto visit this object
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addChildren
protected void addChildren(java.util.List<StateObject> children)
Adds the children of thisStateObjectto the given list.- Overrides:
addChildrenin classAbstractStateObject- Parameters:
children- The list used to store the children
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addNot
public EmptyCollectionComparisonExpressionStateObject addNot()
Makes sure theNOTidentifier is specified.- Returns:
- This object
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getExpression
public EmptyCollectionComparisonExpression getExpression()
Returns the actual parsed object if thisStateObjectrepresentation of the JPQL query was created by parsing an existing JPQL query.- Specified by:
getExpressionin interfaceStateObject- Overrides:
getExpressionin classAbstractStateObject- Returns:
- The parsed object when a JPQL query is parsed and converted into a
StateObjectornullwhen the JPQL query is manually created (i.e. not from a string)
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getStateObject
public CollectionValuedPathExpressionStateObject getStateObject()
Returns theCollectionValuedPathExpressionStateObjectrepresenting the collection- valued path expression.- Returns:
- The
CollectionValuedPathExpressionStateObjectrepresenting the collection- valued path expression, which is nevernull
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hasNot
public boolean hasNot()
Determines whether theNOTidentifier is used or not.- Returns:
trueif theNOTidentifier is part of the expression;falseotherwise
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initialize
protected void initialize()
Initializes this state object.- Overrides:
initializein classAbstractStateObject
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isEquivalent
public boolean isEquivalent(StateObject stateObject)
Determines whether the givenStateObjectis equivalent to this one, i.e. the information of bothStateObjectis the same.- Specified by:
isEquivalentin interfaceStateObject- Overrides:
isEquivalentin classAbstractStateObject- Parameters:
stateObject- TheStateObjectto compare its content to this one- Returns:
trueif both object are equivalent;falseotherwise
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removeNot
public void removeNot()
Makes sure theNOTidentifier is not specified.
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setExpression
public void setExpression(EmptyCollectionComparisonExpression expression)
Keeps a reference of theparsed objectobject, which should only be done when this object is instantiated during the conversion of a parsed JPQL query intoStateObjects.- Parameters:
expression- Theparsed objectrepresenting anEMPTYexpression
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setNot
public void setNot(boolean not)
Sets whether theNOTidentifier should be part of the expression or not.- Parameters:
not-trueif theNOTidentifier should be part of the expression;falseotherwise
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toggleNot
public void toggleNot()
Changes the visibility state of theNOTidentifier.
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toTextInternal
protected void toTextInternal(java.lang.Appendable writer) throws java.io.IOExceptionPrints out a string representation of thisStateObject, which should not be used to define atruestring representation of a JPQL query but should be used for debugging purposes.- Specified by:
toTextInternalin classAbstractStateObject- Parameters:
writer- The writer used to print out the string representation- Throws:
java.io.IOException- This should never happens, it is only required becauseAppendableis used instead of any concrete class
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