org.datanucleus.query.expression
Class JoinExpression

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

All Implemented Interfaces:

Serializable

public class JoinExpression
extends Expression

Expression representing a join between a candidate class, and the class of a field of the first class. An example is in JPQL where we have a "from" clause like

SELECT ... FROM Product p JOIN p.reviews r [ON {cond_expr}]

so the join between "Product p" and "Review r" using "p.reviews". Can have a JoinExpression to its right.

See Also:

Serialized Form

Nested Class Summary

static class

JoinExpression.JoinType

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

JoinExpression(PrimaryExpression expr, String alias, JoinExpression.JoinType type)

Method Summary

Symbol	bind(SymbolTable symtbl) Method to bind the expression to the symbol table as appropriate.
String	getAlias()
DyadicExpression	getOnExpression()
PrimaryExpression	getPrimaryExpression()
JoinExpression.JoinType	getType()
void	setJoinExpression(JoinExpression expr)
void	setOnExpression(DyadicExpression expr)
String	toString()

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

evaluate, 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

JoinExpression

public JoinExpression(PrimaryExpression expr,
                      String alias,
                      JoinExpression.JoinType type)

Method Detail

setJoinExpression

public void setJoinExpression(JoinExpression expr)

setOnExpression

public void setOnExpression(DyadicExpression expr)

getPrimaryExpression

public PrimaryExpression getPrimaryExpression()

getOnExpression

public DyadicExpression getOnExpression()

getAlias

public String getAlias()

Overrides:

getAlias in class Expression

getType

public JoinExpression.JoinType getType()

bind

public Symbol bind(SymbolTable symtbl)

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

toString

public String toString()

Overrides:

toString in class Object