Package org.springframework.data.relational.core.sql

Class CaseExpression

java.lang.Object

org.springframework.data.relational.core.sql.CaseExpression

All Implemented Interfaces:

Expression, Segment, Visitable

public class CaseExpression
extends Object
implements Expression

Case with one or more conditions expression.

Results in a rendered condition:

   CASE
     WHEN condition1 THEN result1
     WHEN condition2 THEN result2
     ELSE result
   END
 

Since:

3.4

Author:

Sven Rienstra

Method Summary

Modifier and Type	Method	Description
static CaseExpression	create(When condition)	Create CASE Expression with initial When condition.
CaseExpression	elseExpression(Expression elseExpression)	Add ELSE clause
boolean	equals(Object obj)	Check whether this Segment is equal to another Segment.
int	hashCode()	Generate a hash code from thisSegment.
String	toString()	Return a SQL string representation of this Segment.
void	visit(Visitor visitor)	Accept a Visitor visiting this Visitable and its nested Visitables if applicable.
CaseExpression	when(When condition)	Add additional When condition

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.springframework.data.relational.core.sql.Segment

equals, hashCode

Methods inherited from interface org.springframework.data.relational.core.sql.Visitable

visit

Method Details

create

public static CaseExpression create(When condition)

Create CASE Expression with initial When condition.

Parameters:

condition - initial When condition

Returns:

the CaseExpression

when

public CaseExpression when(When condition)

Add additional When condition

Parameters:

condition - the When condition

Returns:

the CaseExpression

elseExpression

public CaseExpression elseExpression(Expression elseExpression)

Add ELSE clause

Parameters:

elseExpression - the Expression else value

Returns:

the CaseExpression

toString

public String toString()

Description copied from interface: Segment

Return a SQL string representation of this Segment.

The representation is intended for debugging purposes and an approximation to the generated SQL. While it might work in the context of a specific dialect, you should not assume that the Segment.toString() representation works across multiple databases.

Specified by:

toString in interface Segment

Returns:

a SQL string representation of this Segment.

visit

public void visit(Visitor visitor)

Description copied from interface: Visitable

Accept a Visitor visiting this Visitable and its nested Visitables if applicable.

Specified by:

visit in interface Visitable

Parameters:

visitor - the visitor to notify, must not be null.

hashCode

public int hashCode()

Description copied from interface: Segment

Generate a hash code from thisSegment.

Hashcode typically derives from the Segment.toString() representation so two Segments yield the same Segment.hashCode() if their Segment.toString() representation matches.

Specified by:

hashCode in interface Segment

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

equals

public boolean equals(@Nullable
 Object obj)

Description copied from interface: Segment

Check whether this Segment is equal to another Segment.

Equality is typically given if the Segment.toString() representation matches.

Specified by:

equals in interface Segment

Overrides:

equals in class Object

Parameters:

obj - the reference object with which to compare.

Returns:

true if this object is the same as the other argument; false otherwise.