Module org.eclipse.persistence.jpa.jpql

Package org.eclipse.persistence.jpa.jpql.tools.model.query

Class IndexExpressionStateObject

java.lang.Object

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractEncapsulatedExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.EncapsulatedIdentificationVariableExpressionStateObject

org.eclipse.persistence.jpa.jpql.tools.model.query.IndexExpressionStateObject

All Implemented Interfaces:

StateObject

public class IndexExpressionStateObject
extends EncapsulatedIdentificationVariableExpressionStateObject

The INDEX function returns an integer value corresponding to the position of its argument in an ordered list. The INDEX function can only be applied to identification variables denoting types for which an order column has been specified.

BNF: expression ::= INDEX(identification_variable)

Since:

2.4

Version:

2.4

See Also:

• IndexExpression

Field Summary

Fields inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.EncapsulatedIdentificationVariableExpressionStateObject

IDENTIFICATION_VARIABLE_PROPERTY

Fields inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

STATE_OBJECT_PROPERTY

Constructor Summary

Constructors

Constructor	Description
IndexExpressionStateObject(StateObject parent)	Creates a new IndexExpressionStateObject.
IndexExpressionStateObject(StateObject parent, String identificationVariable)	Creates a new IndexExpressionStateObject.

Method Summary

Modifier and Type	Method	Description
void	accept(StateObjectVisitor visitor)	Visits this StateObject by the given visitor.
IndexExpression	getExpression()	Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
String	getIdentifier()	Returns the JPQL identifier of the expression represented by this AbstractSingleEncapsulatedExpressionStateObject.
void	setExpression(IndexExpression 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.tools.model.query.EncapsulatedIdentificationVariableExpressionStateObject

checkIntegrity, clearResolvedObjects, getIdentificationVariable, getManagedType, getQueryBNFId, getStateObject, getType, getTypeDeclaration, hasIdentificationVariable, initialize, resolveManagedType, resolveType, resolveTypeDeclaration, setIdentificationVariable

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractSingleEncapsulatedExpressionStateObject

addChildren, hasStateObject, isEquivalent, parse, setStateObject, toTextEncapsulatedExpression

Methods inherited from class org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractEncapsulatedExpressionStateObject

toTextInternal

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

Constructor Details

IndexExpressionStateObject

public IndexExpressionStateObject(StateObject parent)

Creates a new IndexExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

Throws:

NullPointerException - The given parent cannot be null

IndexExpressionStateObject

public IndexExpressionStateObject(StateObject parent,
 String identificationVariable)

Creates a new IndexExpressionStateObject.

Parameters:

parent - The parent of this state object, which cannot be null

identificationVariable - The name of the identification variable

Throws:

NullPointerException - The given parent cannot be null

Method Details

accept

public void accept(StateObjectVisitor visitor)

Description copied from interface: StateObject

Visits this StateObject by the given visitor.

Parameters:

visitor - The visitor to visit this object

getExpression

public IndexExpression getExpression()

Description copied from interface: StateObject

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 String getIdentifier()

Description copied from class: AbstractEncapsulatedExpressionStateObject

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

setExpression

public void setExpression(IndexExpression 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 an INDEX expression