org.d2rq.db.expr
Class NotNull

java.lang.Object
  extended by org.d2rq.db.expr.Expression
      extended by org.d2rq.db.expr.NotNull

public class NotNull
extends Expression


Field Summary
 
Fields inherited from class org.d2rq.db.expr.Expression
FALSE, TRUE
 
Method Summary
static Expression create(Expression expr)
           
 boolean equals(Object other)
           
 Set<ColumnName> getColumns()
           
 DataType getDataType(DatabaseOp table, Vendor vendor)
           
 int hashCode()
           
 boolean isConstant()
           
 boolean isConstantColumn(ColumnName column, boolean constIfTrue, boolean constIfFalse, boolean constIfConstantValue)
          Checks whether this expression forces a given column to be a constant, that is, have the same value everywhere.
 boolean isFalse()
           
 boolean isTrue()
           
 Expression rename(Renamer columnRenamer)
           
 String toSQL(DatabaseOp table, Vendor vendor)
           
 String toString()
           
 
Methods inherited from class org.d2rq.db.expr.Expression
and, or
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Method Detail

create

public static Expression create(Expression expr)

getColumns

public Set<ColumnName> getColumns()
Specified by:
getColumns in class Expression

isFalse

public boolean isFalse()
Specified by:
isFalse in class Expression

isTrue

public boolean isTrue()
Specified by:
isTrue in class Expression

isConstant

public boolean isConstant()
Specified by:
isConstant in class Expression

isConstantColumn

public boolean isConstantColumn(ColumnName column,
                                boolean constIfTrue,
                                boolean constIfFalse,
                                boolean constIfConstantValue)
Description copied from class: Expression
Checks whether this expression forces a given column to be a constant, that is, have the same value everywhere. For example, T.COL1=5 forces T.COL1 to be constant if the expression is assumed to be true; T.COL1+1 forces it to be constant if the expression is assumed to evaluate to a constant value. Exactly one of the three constXXX arguments must be true, the other two must be false.

Specified by:
isConstantColumn in class Expression
Parameters:
column - The column to be checked
constIfTrue - Is the column constant assuming the expression evaluates to true?
constIfFalse - Is the column constant assuming the expression evaluates to false?
constIfConstantValue - Is column constant assuming the expression evaluates to a value equal to some constant?

rename

public Expression rename(Renamer columnRenamer)
Specified by:
rename in class Expression

toSQL

public String toSQL(DatabaseOp table,
                    Vendor vendor)
Specified by:
toSQL in class Expression

getDataType

public DataType getDataType(DatabaseOp table,
                            Vendor vendor)
Specified by:
getDataType in class Expression

toString

public String toString()
Overrides:
toString in class Object

equals

public boolean equals(Object other)
Overrides:
equals in class Object

hashCode

public int hashCode()
Overrides:
hashCode in class Object