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

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

All Implemented Interfaces:

StateObject

Direct Known Subclasses:

AbsExpressionStateObject, AggregateFunctionStateObject, AllOrAnyExpressionStateObject, EncapsulatedIdentificationVariableExpressionStateObject, ExistsExpressionStateObject, LengthExpressionStateObject, LowerExpressionStateObject, SizeExpressionStateObject, SqrtExpressionStateObject, SubExpressionStateObject, TrimExpressionStateObject, TypeExpressionStateObject, UpperExpressionStateObject

public abstract class AbstractSingleEncapsulatedExpressionStateObject
extends AbstractEncapsulatedExpressionStateObject

This StateObject represents a JPQL expression that has a JPQL identifier followed by an encapsulated expression with parenthesis.

BNF: expression ::= <identifier>(expression)

Version:

2.4

See Also:

AbstractSingleEncapsulatedExpression

Author:

Pascal Filion

Since:

2.4

Field Summary

static java.lang.String

STATE_OBJECT_PROPERTY Notifies the encapsulated StateObject has changed.

Constructor Summary

protected	AbstractSingleEncapsulatedExpressionStateObject(StateObject parent) Creates a new AbstractSingleEncapsulatedExpressionStateObject.
protected	AbstractSingleEncapsulatedExpressionStateObject(StateObject parent, StateObject stateObject) Creates a new AbstractSingleEncapsulatedExpressionStateObject.
protected	AbstractSingleEncapsulatedExpressionStateObject(StateObject parent, java.lang.String jpqlFragment) Creates a new AbstractSingleEncapsulatedExpressionStateObject.

Method Summary

protected void	addChildren(java.util.List<StateObject> children) Adds the children of this StateObject to the given list.
AbstractSingleEncapsulatedExpression	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
protected abstract java.lang.String	getQueryBNFId() Returns the unique identifier of the JPQLQueryBNF that will determine how to parse the encapsulated expression.
StateObject	getStateObject() Returns the encapsulated StateObject.
boolean	hasStateObject() Determines whether the StateObject representing the encapsulated expression is present or not.
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	parse(java.lang.String jpqlFragment) Parses the given JPQL fragment, which represents the encapsulated expression, and creates the StateObject.
protected void	setStateObject(StateObject stateObject) Sets the given StateObject to represent the new encapsulated expression.
protected void	toTextEncapsulatedExpression(java.lang.Appendable writer) Prints out a string representation of this encapsulated information, 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.model.query.AbstractEncapsulatedExpressionStateObject

getIdentifier, 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, initialize, 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

accept

Field Detail

STATE_OBJECT_PROPERTY

public static final java.lang.String STATE_OBJECT_PROPERTY

Notifies the encapsulated StateObject has changed.

See Also:

Constant Field Values

Constructor Detail

AbstractSingleEncapsulatedExpressionStateObject

protected AbstractSingleEncapsulatedExpressionStateObject(StateObject parent)

Creates a new AbstractSingleEncapsulatedExpressionStateObject.

Parameters:

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

Throws:

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

AbstractSingleEncapsulatedExpressionStateObject

protected AbstractSingleEncapsulatedExpressionStateObject(StateObject parent,
                                                          StateObject stateObject)

Creates a new AbstractSingleEncapsulatedExpressionStateObject.

Parameters:

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

stateObject - The StateObject representing the encapsulated expression

Throws:

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

AbstractSingleEncapsulatedExpressionStateObject

protected AbstractSingleEncapsulatedExpressionStateObject(StateObject parent,
                                                          java.lang.String jpqlFragment)

Creates a new AbstractSingleEncapsulatedExpressionStateObject.

Parameters:

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

jpqlFragment - The portion of the query representing the encapsulated expression

Throws:

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

Method Detail

addChildren

protected void addChildren(java.util.List<StateObject> children)

Adds the children of this StateObject to the given list.

Overrides:

addChildren in class AbstractStateObject

Parameters:

children - The list used to store the children

getExpression

public AbstractSingleEncapsulatedExpression 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 AbstractEncapsulatedExpressionStateObject

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)

getQueryBNFId

protected abstract java.lang.String getQueryBNFId()

Returns the unique identifier of the JPQLQueryBNF that will determine how to parse the encapsulated expression.

Returns:

The non-null ID of the BNF

getStateObject

public StateObject getStateObject()

Returns the encapsulated StateObject.

Returns:

The encapsulated StateObject

hasStateObject

public boolean hasStateObject()

Determines whether the StateObject representing the encapsulated expression is present or not.

Returns:

true if the encapsulated StateObject is not null; false otherwise

isEquivalent

public boolean isEquivalent(StateObject stateObject)

Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.

Specified by:

isEquivalent in interface StateObject

Overrides:

isEquivalent in class AbstractStateObject

Parameters:

stateObject - The StateObject to compare its content to this one

Returns:

true if both object are equivalent; false otherwise

parse

public void parse(java.lang.String jpqlFragment)

Parses the given JPQL fragment, which represents the encapsulated expression, and creates the StateObject.

Parameters:

jpqlFragment - The portion of the query representing the encapsulated expression

setStateObject

protected void setStateObject(StateObject stateObject)

Sets the given StateObject to represent the new encapsulated expression.

Parameters:

stateObject - The new encapsulated StateObject

toTextEncapsulatedExpression

protected void toTextEncapsulatedExpression(java.lang.Appendable writer)
                                     throws java.io.IOException

Prints out a string representation of this encapsulated information, which should not be used to define a true string representation of a JPQL query but should be used for debugging purposes.

Specified by:

toTextEncapsulatedExpression in class AbstractEncapsulatedExpressionStateObject

Parameters:

writer - The writer used to print out the string representation of the encapsulated information

Throws:

java.io.IOException - This should never happens, only required because Appendable is used instead of StringBuilder for instance