EclipseLink 2.4.2, build 'v20130514-5956486' API Reference

org.eclipse.persistence.jpa.jpql.model.query
Class KeyExpressionStateObject

java.lang.Object
  extended by org.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject
      extended by org.eclipse.persistence.jpa.jpql.model.query.AbstractEncapsulatedExpressionStateObject
          extended by org.eclipse.persistence.jpa.jpql.model.query.AbstractSingleEncapsulatedExpressionStateObject
              extended by org.eclipse.persistence.jpa.jpql.model.query.EncapsulatedIdentificationVariableExpressionStateObject
                  extended by org.eclipse.persistence.jpa.jpql.model.query.KeyExpressionStateObject
All Implemented Interfaces:
StateObject

public class KeyExpressionStateObject
extends EncapsulatedIdentificationVariableExpressionStateObject

This object represents an identification variable that maps the keys of a Map.

This is part of JPA 2.0.

BNF: KEY(identification_variable)

Version:
2.4
See Also:
KeyExpression
Author:
Pascal Filion
Since:
2.4

Field Summary
 
Fields inherited from class org.eclipse.persistence.jpa.jpql.model.query.EncapsulatedIdentificationVariableExpressionStateObject
IDENTIFICATION_VARIABLE_PROPERTY
 
Fields inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractSingleEncapsulatedExpressionStateObject
STATE_OBJECT_PROPERTY
 
Constructor Summary
KeyExpressionStateObject(StateObject parent)
          Creates a new KeyExpressionStateObject.
KeyExpressionStateObject(StateObject parent, java.lang.String identificationVariable)
          Creates a new KeyExpressionStateObject.
 
Method Summary
 void accept(StateObjectVisitor visitor)
          Visits this StateObject by the given visitor.
 KeyExpression 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.
protected  IType resolveType()
          Resolves the IType of the property handled by this object.
 void setExpression(KeyExpression 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.
 
Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.EncapsulatedIdentificationVariableExpressionStateObject
checkIntegrity, clearResolvedObjects, getIdentificationVariable, getManagedType, getQueryBNFId, getStateObject, getType, getTypeDeclaration, hasIdentificationVariable, initialize, resolveManagedType, resolveTypeDeclaration, setIdentificationVariable
 
Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractSingleEncapsulatedExpressionStateObject
addChildren, hasStateObject, isEquivalent, parse, setStateObject, toTextEncapsulatedExpression
 
Methods inherited from class org.eclipse.persistence.jpa.jpql.model.query.AbstractEncapsulatedExpressionStateObject
toTextInternal
 
Methods inherited from class org.eclipse.persistence.jpa.jpql.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
 

Constructor Detail

KeyExpressionStateObject

public KeyExpressionStateObject(StateObject parent)
Creates a new KeyExpressionStateObject.

Parameters:
parent - The parent of this state object, which cannot be null
Throws:
java.lang.NullPointerException - The given parent cannot be null

KeyExpressionStateObject

public KeyExpressionStateObject(StateObject parent,
                                java.lang.String identificationVariable)
Creates a new KeyExpressionStateObject.

Parameters:
parent - The parent of this state object, which cannot be null
identificationVariable - The identification variable
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

getExpression

public KeyExpression 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 EncapsulatedIdentificationVariableExpressionStateObject
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

resolveType

protected IType resolveType()
Resolves the IType of the property handled by this object.

Overrides:
resolveType in class EncapsulatedIdentificationVariableExpressionStateObject
Returns:
Either the IType that was resolved by this object or the IType for IType.UNRESOLVABLE_TYPE if it could not be resolved

setExpression

public void setExpression(KeyExpression 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 a KEY expression

EclipseLink 2.4.2, build 'v20130514-5956486' API Reference