JoinExpression (DataNucleus Core 6.0.1-SNAPSHOT API)

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 class JoinExpression.JoinType
- Nested classes/interfaces inherited from class org.datanucleus.store.query.expression.Expression
  Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary
- Fields inherited from class org.datanucleus.store.query.expression.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

All Methods Instance Methods Concrete Methods
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 org.datanucleus.store.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(Expression expr,
                      String alias,
                      JoinExpression.JoinType type)

Method Detail

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