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

Class OrderByClauseStateObject

java.lang.Object

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

org.eclipse.persistence.jpa.jpql.tools.model.query.AbstractListHolderStateObject<OrderByItemStateObject>

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

All Implemented Interfaces:

ListHolderStateObject<OrderByItemStateObject>, StateObject

public class OrderByClauseStateObject
extends AbstractListHolderStateObject<OrderByItemStateObject>

The ORDER BY clause allows the objects or values that are returned by the query to be ordered.

BNF: orderby_clause ::= ORDER BY orderby_item {, orderby_item}*

Version:

2.4

See Also:

OrderByClause

Author:

Pascal Filion

Since:

2.4

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	ORDER_BY_ITEMS_LIST Notify the list of StateObjects representing the ORDER BY items.

Constructor Summary

Constructors

Constructor and Description
OrderByClauseStateObject(SelectStatementStateObject parent) Creates a new OrderByClauseStateObject.

Method Summary

Modifier and Type	Method and Description
void	accept(StateObjectVisitor visitor) Visits this StateObject by the given visitor.
OrderByItemStateObject	addItem() Adds a new ORDER BY item to this clause.
OrderByItemStateObject	addItem(OrderByItem.Ordering ordering) Adds a new ORDER BY item to this clause.
OrderByItemStateObject	addItem(java.lang.String... paths) Adds a new ORDER BY item to this clause.
OrderByItemStateObject	addItem(java.lang.String variable) Adds a new ORDER BY item to this clause.
OrderByItemStateObject	addItem(java.lang.String path, OrderByItem.Ordering ordering) Adds a new ORDER BY item to this clause.
OrderByItemStateObject	addItemAsc(java.lang.String variable) Adds a new ORDER BY item to this clause with ASC.
OrderByItemStateObject	addItemDesc(java.lang.String variable) Adds a new ORDER BY item to this clause with DESC.
OrderByItemStateObject	addOrderByItem(java.lang.String[] paths, OrderByItem.Ordering ordering) Adds a new ORDER BY item to this clause.
OrderByClause	getExpression() Returns the actual parsed object if this StateObject representation of the JPQL query was created by parsing an existing JPQL query.
SelectStatementStateObject	getParent() Returns the parent of this StateObject.
boolean	isEquivalent(StateObject stateObject) Determines whether the given StateObject is equivalent to this one, i.e. the information of both StateObject is the same.
protected java.lang.String	listName() Returns the name that is uniquely identifying the list.
void	parse(java.lang.String jpqlFragment) Parses the given JPQL fragment, which represents either a single or many ordering items, the fragment will be parsed and converted into OrderByItemStateObject.
void	setExpression(OrderByClause 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.tools.model.query.AbstractListHolderStateObject

addChildren, addItem, addItems, addListChangeListener, areChildrenEquivalent, canMoveDown, canMoveUp, getItem, hasItems, initialize, items, itemsSize, moveDown, moveUp, removeItem, removeItems, removeListChangeListener, toStringItems

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, 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.tools.model.query.StateObject

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

Field Detail

ORDER_BY_ITEMS_LIST

public static final java.lang.String ORDER_BY_ITEMS_LIST

Notify the list of StateObjects representing the ORDER BY items.

See Also:

Constant Field Values

Constructor Detail

OrderByClauseStateObject

public OrderByClauseStateObject(SelectStatementStateObject parent)

Creates a new OrderByClauseStateObject.

Parameters:

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

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

addItem

public OrderByItemStateObject addItem()

Adds a new ORDER BY item to this clause.

Returns:

The newly added OrderByItemStateObject

addItem

public OrderByItemStateObject addItem(OrderByItem.Ordering ordering)

Adds a new ORDER BY item to this clause.

Parameters:

ordering - The ascending order

Returns:

The newly added OrderByItemStateObject

addItem

public OrderByItemStateObject addItem(java.lang.String... paths)

Adds a new ORDER BY item to this clause.

Returns:

The newly added OrderByItemStateObject

addItem

public OrderByItemStateObject addItem(java.lang.String variable)

Adds a new ORDER BY item to this clause.

Parameters:

variable - The identification variable or the result variable

Returns:

The newly added OrderByItemStateObject

addItem

public OrderByItemStateObject addItem(java.lang.String path,
                                      OrderByItem.Ordering ordering)

Adds a new ORDER BY item to this clause.

Parameters:

path - The identification variable or the result variable

ordering - The ascending order

Returns:

The newly added OrderByItemStateObject

addItemAsc

public OrderByItemStateObject addItemAsc(java.lang.String variable)

Adds a new ORDER BY item to this clause with ASC.

Parameters:

variable - The identification variable or the result variable

Returns:

The newly added OrderByItemStateObject

addItemDesc

public OrderByItemStateObject addItemDesc(java.lang.String variable)

Adds a new ORDER BY item to this clause with DESC.

Parameters:

variable - The identification variable or the result variable

Returns:

The newly added OrderByItemStateObject

addOrderByItem

public OrderByItemStateObject addOrderByItem(java.lang.String[] paths,
                                             OrderByItem.Ordering ordering)

Adds a new ORDER BY item to this clause.

Parameters:

paths - The paths or the item

ordering - The ascending order

Returns:

The newly added OrderByItemStateObject

getExpression

public OrderByClause 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)

getParent

public SelectStatementStateObject 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

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

listName

protected java.lang.String listName()

Returns the name that is uniquely identifying the list.

Specified by:

listName in class AbstractListHolderStateObject<OrderByItemStateObject>

Returns:

The unique name identifying the list

parse

public void parse(java.lang.String jpqlFragment)

Parses the given JPQL fragment, which represents either a single or many ordering items, the fragment will be parsed and converted into OrderByItemStateObject.

Parameters:

jpqlFragment - The portion of the query to parse

setExpression

public void setExpression(OrderByClause 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 ORDER BY clause

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