net.sf.basedb.core.query
Class CaseExpression

java.lang.Object
  net.sf.basedb.core.query.CaseExpression

All Implemented Interfaces:

Expression, QueryElement

public class CaseExpression
extends Object
implements Expression

An SQL case expression:

CASE
   WHEN r1 THEN e1
   WHEN r2 THEN e2
   ...
   ELSE elseExpression
END

Version:

2.0

Author:

nicklas

See Also:

Expressions.caseWhen(Expression, WhenStatement[])

Last modified

$Date: 2010-04-21 11:48:29 +0200 (Wed, 21 Apr 2010) $

Field Summary

private Expression	elseExpression
private int	hashCode
private WhenStatement[]	whenStatements

Constructor Summary

CaseExpression(Expression elseExpression, WhenStatement... whenStatements)

Method Summary

boolean	equals(Object other) This expression is equal to another CaseExpression if both contains the same when statements (disregarding order) and else expression.
Collection<? extends QueryElement>	getChildren() Get the children of this query element or null if it has no children.
int	hashCode()
String	toQl(Query query, DbControl dc) Create a query language string of the query element.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

elseExpression

private final Expression elseExpression

whenStatements

private final WhenStatement[] whenStatements

hashCode

private int hashCode

Constructor Detail

CaseExpression

CaseExpression(Expression elseExpression,
               WhenStatement... whenStatements)

Method Detail

toQl

public String toQl(Query query,
                   DbControl dc)
            throws BaseException

Description copied from interface: QueryElement

Create a query language string of the query element. Use the Query.getQueryType() method to find out which query language is wanted in case the element requires different syntax for different languages.

Specified by:

toQl in interface QueryElement

Parameters:

query - The query that is about to be executed

dc - The DbControl object used to execute the query

Throws:

BaseException - If there is any other error

getChildren

public Collection<? extends QueryElement> getChildren()

Description copied from interface: QueryElement

Get the children of this query element or null if it has no children. For example the AddExpression has two children, the expression beeing added.

Specified by:

getChildren in interface QueryElement

Returns:

All expressions and restrictions used

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object other)

This expression is equal to another CaseExpression if both contains the same when statements (disregarding order) and else expression.

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object