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

java.lang.Object
  org.eclipse.persistence.jpa.jpql.model.query.AbstractStateObject
      org.eclipse.persistence.jpa.jpql.model.query.AbstractRangeVariableDeclarationStateObject
          org.eclipse.persistence.jpa.jpql.model.query.DerivedPathVariableDeclarationStateObject

All Implemented Interfaces:

StateObject, VariableDeclarationStateObject

public class DerivedPathVariableDeclarationStateObject
extends AbstractRangeVariableDeclarationStateObject

BNF: subselect_identification_variable_declaration ::= derived_path_expression [AS] identification_variable {join}*

BNF: derived_path_expression ::= superquery_identification_variable.{single_valued_object_field.}*collection_valued_field | superquery_identification_variable.{single_valued_object_field.}*single_valued_object_field

Version:

2.4

See Also:

RangeVariableDeclaration

Author:

Pascal Filion

Since:

2.4

Field Summary

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

AS_PROPERTY, IDENTIFICATION_VARIABLE_PROPERTY

Constructor Summary

DerivedPathVariableDeclarationStateObject(DerivedPathIdentificationVariableDeclarationStateObject parent)
Creates a new DerivedPathVariableDeclarationStateObject.

DerivedPathVariableDeclarationStateObject(DerivedPathIdentificationVariableDeclarationStateObject parent, java.lang.String path)
Creates a new DerivedPathVariableDeclarationStateObject.

Method Summary

void	accept(StateObjectVisitor visitor) Visits this StateObject by the given visitor.
protected StateObject	buildRootStateObject()
IManagedType	getManagedType(StateObject stateObject) Returns the IManagedType for the given identification variable.
DerivedPathIdentificationVariableDeclarationStateObject	getParent() Returns the parent of this StateObject.
java.lang.String	getPath() Returns the string representation of the path expression.
java.lang.String	getRootPath() Returns the "root" object for objects which may not be reachable by navigation.
CollectionValuedPathExpressionStateObject	getRootStateObject() Returns the StateObject holding onto the abstract schema name.
void	setRootPath(java.lang.String path) Sets the "root" object for objects which may not be reachable by navigation.

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

addAs, addChildren, addProblems, getExpression, getIdentificationVariable, getIdentificationVariableStateObject, hasAs, hasIdentificationVariable, identificationVariables, initialize, isEquivalent, isIdentificationVariableOptional, isIdentificationVariableVirtual, setAs, setExpression, setIdentificationVariable, setIdentificationVariableOptional, toggleAs, toTextInternal

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

acceptUnknownVisitor, acceptUnknownVisitor, addPropertyChangeListener, areEquivalent, buildProblem, buildProblem, buildStateObject, buildStateObjects, checkParent, children, decorate, equals, findIdentificationVariable, firePropertyChanged, getChangeSupport, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, 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

Methods inherited from interface org.eclipse.persistence.jpa.jpql.model.query.StateObject

addPropertyChangeListener, children, decorate, findIdentificationVariable, getDeclaration, getDecorator, getGrammar, getManagedTypeProvider, getQueryBuilder, getRoot, isDecorated, removePropertyChangeListener, setParent, toString, toText

Constructor Detail

DerivedPathVariableDeclarationStateObject

public DerivedPathVariableDeclarationStateObject(DerivedPathIdentificationVariableDeclarationStateObject parent)

Creates a new DerivedPathVariableDeclarationStateObject.

Parameters:

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

Throws:

java.lang.NullPointerException - The given parent cannot be null

DerivedPathVariableDeclarationStateObject

public DerivedPathVariableDeclarationStateObject(DerivedPathIdentificationVariableDeclarationStateObject parent,
                                                 java.lang.String path)

Creates a new DerivedPathVariableDeclarationStateObject.

Parameters:

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

path - Either the derived singled-valued object path expression or the collection-valued path expression

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

buildRootStateObject

protected StateObject buildRootStateObject()

Specified by:

buildRootStateObject in class AbstractRangeVariableDeclarationStateObject

getManagedType

public IManagedType getManagedType(StateObject stateObject)

Returns the IManagedType for the given identification variable. The search does not traverse up the query hierarchy if this declaration is for a subquery.

SELECT e FROM Department d JOIN KEY(d.employees).addresses a

In the above query, the managed type associated with the identification variable:

• d is "Department"
• a is "Address"

Parameters:

stateObject - The StateObject that should be an simple identification variable or an encapsulated identification variable with the identifier KEY or VALUE

Returns:

The IManagedType representing the domain object declared by the given identification variable

getParent

public DerivedPathIdentificationVariableDeclarationStateObject getParent()

Returns the parent of this StateObject.

Specified by:

getParent in interface StateObject

Overrides:

getParent in class AbstractStateObject

Returns:

Returns the parent of this StateObject, which is null only when this is the root of the hierarchy

getPath

public java.lang.String getPath()

Returns the string representation of the path expression. If the identification variable is virtual, then it is not part of the result.

Returns:

The path expression, which is never null

getRootPath

public java.lang.String getRootPath()

Returns the "root" object for objects which may not be reachable by navigation.

Specified by:

getRootPath in class AbstractRangeVariableDeclarationStateObject

Returns:

The "root" object

getRootStateObject

public CollectionValuedPathExpressionStateObject getRootStateObject()

Returns the StateObject holding onto the abstract schema name.

Overrides:

getRootStateObject in class AbstractRangeVariableDeclarationStateObject

Returns:

The StateObject, which is never null

setRootPath

public void setRootPath(java.lang.String path)

Sets the "root" object for objects which may not be reachable by navigation.

Specified by:

setRootPath in class AbstractRangeVariableDeclarationStateObject

Parameters:

path - The "root" object