Class OrderExpression

java.lang.Object

org.datanucleus.store.query.expression.Expression

org.datanucleus.store.query.expression.OrderExpression

All Implemented Interfaces:

Serializable

public class OrderExpression
extends Expression

Expression as part of an ordering clause. Composed of an expression and an order direction.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class Expression

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

Fields

Modifier and Type	Field	Description
private NullOrderingType	nullOrder	Optional specification for null ordering.
private static final long	serialVersionUID
private String	sortOrder

Fields inherited from class Expression

alias, left, op, OP_ADD, OP_AND, OP_BIT_AND, OP_BIT_OR, OP_BIT_XOR, OP_CAST, OP_COM, OP_CONCAT, OP_DISTINCT, OP_DIV, OP_EQ, OP_GT, OP_GTEQ, OP_IN, OP_IS, OP_ISNOT, OP_LIKE, OP_LT, OP_LTEQ, OP_MOD, OP_MUL, OP_NEG, OP_NOT, OP_NOTEQ, OP_NOTIN, OP_OR, OP_SUB, parent, right, symbol

Constructor Summary

Constructors

Constructor	Description
OrderExpression(Expression expr)
OrderExpression(Expression expr, String sortOrder)	Constructor.
OrderExpression(Expression expr, String sortOrder, String nullOrder)	Constructor.

Method Summary

Modifier and Type	Method	Description
Symbol	bind(SymbolTable symtbl)	Method to bind the expression to the symbol table as appropriate.
Object	evaluate(ExpressionEvaluator eval)	Method to evaluate this expression, using the passed evaluator.
NullOrderingType	getNullOrder()
String	getSortOrder()
String	toString()

Methods inherited from class Expression

getAlias, getLeft, getOperator, getParent, getRight, getSymbol, setAlias, setLeft, setRight

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

serialVersionUID

private static final long serialVersionUID

See Also:

• Constant Field Values

sortOrder

private String sortOrder

nullOrder

private NullOrderingType nullOrder

Optional specification for null ordering.

Constructor Details

OrderExpression

public OrderExpression(Expression expr,
 String sortOrder,
 String nullOrder)

Constructor.

Parameters:

expr - The expression to order by

sortOrder - The order (either "ascending" or "descending")

nullOrder - The null order (either "nulls first" or "nulls last")

OrderExpression

public OrderExpression(Expression expr,
 String sortOrder)

Constructor.

Parameters:

expr - The expression to order by

sortOrder - The order (either "ascending" or "descending")

OrderExpression

public OrderExpression(Expression expr)

Method Details

getSortOrder

public String getSortOrder()

getNullOrder

public NullOrderingType getNullOrder()

bind

public Symbol bind(SymbolTable symtbl)

Description copied from class: Expression

Method to bind the expression to the symbol table as appropriate.

Specified by:

bind in class Expression

Parameters:

symtbl - Symbol table

Returns:

The symbol for this expression

evaluate

public Object evaluate(ExpressionEvaluator eval)

Description copied from class: Expression

Method to evaluate this expression, using the passed evaluator.

Overrides:

evaluate in class Expression

Parameters:

eval - Evaluator

Returns:

The result

toString

public String toString()

Overrides:

toString in class Object