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java.lang.Objectorg.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject
org.eclipse.persistence.jpa.jpql.tools.model.query.EmptyCollectionComparisonExpressionStateObject
public class EmptyCollectionComparisonExpressionStateObject
This expression tests whether or not the collection designated by the collection-valued path expression is empty (i.e, has no elements).
empty_collection_comparison_expression ::= collection_valued_path_expression IS [NOT] EMPTY
EmptyCollectionComparisonExpression| Field Summary | |
|---|---|
static java.lang.String |
NOT_PROPERTY
Notifies the visibility of the NOT identifier has changed. |
| Constructor Summary | |
|---|---|
EmptyCollectionComparisonExpressionStateObject(StateObject parent)
Creates a new EmptyCollectionComparisonExpressionStateObject. |
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EmptyCollectionComparisonExpressionStateObject(StateObject parent,
boolean not,
java.lang.String path)
Creates a new EmptyCollectionComparisonExpressionStateObject. |
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EmptyCollectionComparisonExpressionStateObject(StateObject parent,
java.lang.String path)
Creates a new EmptyCollectionComparisonExpressionStateObject. |
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| Method Summary | |
|---|---|
void |
accept(StateObjectVisitor visitor)
Visits this StateObject by the given visitor. |
protected void |
addChildren(java.util.List<StateObject> children)
Adds the children of this StateObject to the given list. |
EmptyCollectionComparisonExpressionStateObject |
addNot()
Makes sure the NOT identifier is specified. |
EmptyCollectionComparisonExpression |
getExpression()
Returns the actual parsed object if this StateObject representation of the JPQL query
was created by parsing an existing JPQL query. |
CollectionValuedPathExpressionStateObject |
getStateObject()
Returns the CollectionValuedPathExpressionStateObject representing the collection-
valued path expression. |
boolean |
hasNot()
Determines whether the NOT identifier is used or not. |
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 |
removeNot()
Makes sure the NOT identifier is not specified. |
void |
setExpression(EmptyCollectionComparisonExpression 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 |
toggleNot()
Changes the visibility state of the NOT identifier. |
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 |
|---|
public static java.lang.String NOT_PROPERTY
NOT identifier has changed.
| Constructor Detail |
|---|
public EmptyCollectionComparisonExpressionStateObject(StateObject parent)
EmptyCollectionComparisonExpressionStateObject.
parent - The parent of this state object, which cannot be null
java.lang.NullPointerException - The given parent cannot be nullpublic EmptyCollectionComparisonExpressionStateObject(StateObject parent, boolean not, java.lang.String path)
EmptyCollectionComparisonExpressionStateObject.
parent - The parent of this state object, which cannot be nullnot - Determines whether the NOT identifier is part of the expression
or notpath - The collection-valued path expression
java.lang.NullPointerException - The given parent cannot be nullpublic EmptyCollectionComparisonExpressionStateObject(StateObject parent, java.lang.String path)
EmptyCollectionComparisonExpressionStateObject.
parent - The parent of this state object, which cannot be nullpath - The collection-valued path expression
java.lang.NullPointerException - The given parent cannot be null| Method Detail |
|---|
public void accept(StateObjectVisitor visitor)
StateObject by the given visitor.
visitor - The visitor to visit this objectprotected void addChildren(java.util.List<StateObject> children)
StateObject to the given list.
addChildren in class AbstractStateObjectchildren - The list used to store the childrenpublic EmptyCollectionComparisonExpressionStateObject addNot()
NOT identifier is specified.
public EmptyCollectionComparisonExpression getExpression()
StateObject representation of the JPQL query
was created by parsing an existing JPQL query.
getExpression in interface StateObjectgetExpression in class AbstractStateObjectStateObject
or null when the JPQL query is manually created (i.e. not from a string)public CollectionValuedPathExpressionStateObject getStateObject()
CollectionValuedPathExpressionStateObject representing the collection-
valued path expression.
CollectionValuedPathExpressionStateObject representing the collection-
valued path expression, which is never nullpublic boolean hasNot()
NOT identifier is used or not.
true if the NOT identifier is part of the expression;
false otherwiseprotected void initialize()
initialize in class AbstractStateObjectpublic boolean isEquivalent(StateObject stateObject)
StateObject is equivalent to this one, i.e. the
information of both StateObject is the same.
isEquivalent in interface StateObjectisEquivalent in class AbstractStateObjectstateObject - The StateObject to compare its content to this one
true if both object are equivalent; false otherwisepublic void removeNot()
NOT identifier is not specified.
public void setExpression(EmptyCollectionComparisonExpression expression)
parsed object object,
which should only be done when this object is instantiated during the conversion of a parsed
JPQL query into StateObjects.
expression - The parsed object representing
an EMPTY
public void setNot(boolean not)
NOT identifier should be part of the expression or not.
not - true if the NOT identifier should be part of the
expression; false otherwisepublic void toggleNot()
NOT identifier.
protected void toTextInternal(java.lang.Appendable writer)
throws java.io.IOException
StateObject, which should not be used to
define a true string representation of a JPQL query but should be used for
debugging purposes.
toTextInternal in class AbstractStateObjectwriter - The writer used to print out the string representation
java.io.IOException - This should never happens, it is only required because Appendable
is used instead of any concrete class
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