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

java.lang.Object
  org.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject
      org.eclipse.persistence.jpa.jpql.model.query.AbstractEncapsulatedExpressionStateObject
          org.eclipse.persistence.jpa.jpql.model.query.AbstractSingleEncapsulatedExpressionStateObject
              org.eclipse.persistence.jpa.jpql.model.query.EncapsulatedIdentificationVariableExpressionStateObject
                  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