org.d2rq.db.op
Class ProjectOp
java.lang.Object
org.d2rq.db.op.DatabaseOp.Wrapper
org.d2rq.db.op.ProjectOp
- All Implemented Interfaces:
- DatabaseOp
public class ProjectOp
- extends DatabaseOp.Wrapper
Also forces all projected columns and expression to be not null.
- Author:
- Richard Cyganiak (richard@cyganiak.de)
create
public static ProjectOp create(DatabaseOp wrapped,
ColumnName... columns)
create
public static ProjectOp create(DatabaseOp wrapped,
Collection<ProjectionSpec> specs)
create
public static ProjectOp create(DatabaseOp wrapped,
ProjectionSpec... specs)
getProjections
public List<ProjectionSpec> getProjections()
hasColumn
public boolean hasColumn(ColumnName column)
- Specified by:
hasColumn
in interface DatabaseOp
- Overrides:
hasColumn
in class DatabaseOp.Wrapper
- Parameters:
column
- A qualified or unqualified column name
- Returns:
false
for ambiguous unqualified names
getColumns
public List<ColumnName> getColumns()
- Specified by:
getColumns
in interface DatabaseOp
- Overrides:
getColumns
in class DatabaseOp.Wrapper
- Returns:
- Fully qualified column names if possible, no duplicates
isNullable
public boolean isNullable(ColumnName column)
- Specified by:
isNullable
in interface DatabaseOp
- Overrides:
isNullable
in class DatabaseOp.Wrapper
getColumnType
public DataType getColumnType(ColumnName column)
- Specified by:
getColumnType
in interface DatabaseOp
- Overrides:
getColumnType
in class DatabaseOp.Wrapper
getUniqueKeys
public Collection<Key> getUniqueKeys()
- Specified by:
getUniqueKeys
in interface DatabaseOp
- Overrides:
getUniqueKeys
in class DatabaseOp.Wrapper
accept
public void accept(OpVisitor visitor)
toString
public String toString()
- Overrides:
toString
in class Object
hashCode
public int hashCode()
- Overrides:
hashCode
in class Object
equals
public boolean equals(Object o)
- Overrides:
equals
in class Object