Class JoinExpression

java.lang.Object

org.datanucleus.store.query.expression.Expression

org.datanucleus.store.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

Nested Classes

Modifier and Type	Class	Description
static enum	JoinExpression.JoinType

Nested classes/interfaces inherited from class Expression

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

Fields

Modifier and Type	Field	Description
(package private) Expression	joinedExpr
(package private) Expression	onExpr
private static final long	serialVersionUID
(package private) JoinExpression.JoinType	type

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

Method Summary

Modifier and Type	Method	Description
Symbol	bind(SymbolTable symtbl)	Method to bind the expression to the symbol table as appropriate.
String	getAlias()
Expression	getJoinedExpression()
Expression	getOnExpression()
JoinExpression.JoinType	getType()
void	setJoinExpression(JoinExpression expr)
void	setOnExpression(Expression expr)
String	toString()

Methods inherited from class Expression

evaluate, 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

type

JoinExpression.JoinType type

joinedExpr

Expression joinedExpr

onExpr

Expression onExpr

Constructor Details

JoinExpression

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

Method Details

setJoinExpression

public void setJoinExpression(JoinExpression expr)

setOnExpression

public void setOnExpression(Expression expr)

getJoinedExpression

public Expression getJoinedExpression()

getOnExpression

public Expression 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