org.datanucleus.query.expression
Class OrderExpression

java.lang.Object
  org.datanucleus.query.expression.Expression
      org.datanucleus.query.expression.OrderExpression

public class OrderExpression
extends Expression

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

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.query.expression.Expression

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

Fields inherited from class org.datanucleus.query.expression.Expression

alias, left, LOCALISER, op, OP_ADD, OP_AND, 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

OrderExpression(Expression expr)

OrderExpression(Expression expr, java.lang.String sortOrder)
Constructor.

Method Summary

Symbol	bind(SymbolTable symtbl) Method to bind the expression to the symbol table as appropriate.
java.lang.Object	evaluate(ExpressionEvaluator eval) Method to evaluate this expression, using the passed evaluator.
java.lang.String	getSortOrder()
java.lang.String	toString()

Methods inherited from class org.datanucleus.query.expression.Expression

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

Methods inherited from class java.lang.Object

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

Constructor Detail

OrderExpression

public OrderExpression(Expression expr,
                       java.lang.String sortOrder)

Constructor.

Parameters:

expr - The expression to order by

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

OrderExpression

public OrderExpression(Expression expr)

Method Detail

getSortOrder

public java.lang.String getSortOrder()

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 java.lang.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 java.lang.String toString()

Overrides:

toString in class java.lang.Object