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

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

All Implemented Interfaces:

StateObject

public final class CollectionExpressionStateObject
extends AbstractStateObject

This StateObject is a temporary object used to store a list of StateObjects. Those objects are not parented. StateObjectVisitor is not aware of this object either, to visit it, the visitor will be notified via reflection, see AbstractStateObject.acceptUnknownVisitor(StateObjectVisitor).

Version:

2.4

See Also:

CollectionExpression

Author:

Pascal Filion

Since:

2.4

Constructor Summary

CollectionExpressionStateObject(StateObject parent, java.util.List<? extends StateObject> items)
Creates a new CollectionExpressionStateObject.

Method Summary

void	accept(StateObjectVisitor visitor) Visits this StateObject by the given visitor.
protected void	addChildren(java.util.List<StateObject> children) Adds the children of this StateObject to the given list.
protected boolean	areChildrenEquivalent(CollectionExpressionStateObject stateObject) Determines whether the children of this StateObject are equivalent to the children of the given one, i.e. the information of the StateObjects is the same.
CollectionExpression	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
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	setExpression(CollectionExpression 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.
protected void	toTextInternal(java.lang.Appendable writer) Prints out a string representation of this StateObject, 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.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

Constructor Detail

CollectionExpressionStateObject

public CollectionExpressionStateObject(StateObject parent,
                                       java.util.List<? extends StateObject> items)

Creates a new CollectionExpressionStateObject.

Parameters:

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

items - The list of children owned by this state object

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

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

areChildrenEquivalent

protected boolean areChildrenEquivalent(CollectionExpressionStateObject stateObject)

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

Parameters:

stateObject - The StateObject to compare its children to this one's children

Returns:

true if both have equivalent children; false otherwise

getExpression

public CollectionExpression 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 AbstractStateObject

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)

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

setExpression

public void setExpression(CollectionExpression 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 collection expression

toTextInternal

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

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

Specified by:

toTextInternal in class AbstractStateObject

Parameters:

writer - The writer used to print out the string representation

Throws:

java.io.IOException - This should never happens, it is only required because Appendable is used instead of any concrete class