org.datanucleus.query.expression
Class ClassExpression

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

public class ClassExpression
extends Expression

Expression representing a candidate in a from clause. An example is in JPQL where we have a "from" clause like

 SELECT ... FROM Product p JOIN p.reviews r

so the candidate "p" of type Product. Can have a JoinExpression to its right.

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

left, LOCALISER, lowestOperator, op, OP_ADD, OP_AND, OP_BETWEEN, 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_OR, OP_SUB, right, symbol

Constructor Summary

ClassExpression(SymbolTable symtbl, java.lang.String alias)

Method Summary

Symbol	bind()
java.lang.Object	evaluate(ExpressionEvaluator eval)
java.lang.String	getAlias()
void	setJoinExpression(JoinExpression expr)

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

getLeft, getOperator, getRight, getSymbol

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassExpression

public ClassExpression(SymbolTable symtbl,
                       java.lang.String alias)

Method Detail

evaluate

public java.lang.Object evaluate(ExpressionEvaluator eval)

Specified by:

evaluate in class Expression

setJoinExpression

public void setJoinExpression(JoinExpression expr)

getAlias

public java.lang.String getAlias()

bind

public Symbol bind()

Specified by:

bind in class Expression