org.eigenbase.sql.type
Class SqlTypeUtil.TypeBuilder

java.lang.Object
  org.eigenbase.sql.type.SqlTypeUtil.TypeBuilder

Enclosing class:

SqlTypeUtil

public static class SqlTypeUtil.TypeBuilder
extends Object

Convenience class for building a struct type with several fields.

TypeBuilder is more convenient because it supports chained calls to add one field at a time. The chained syntax means that you can use a TypeBuilder in contexts where only an expression is allowed, for example in a field initializer. There are several overloadings of the add method for types which take different parameters, and you can explicitly state whether you want a field to be nullable.

For example, to create the type

 (A BOOLEAN NOT NULL, B VARCHAR(10), C DECIMAL(6,2))
 

the code is

 RelDataTypeFactory typeFactory;
 return new TypeBuilder(typeFactory)
     .add("A", SqlTypeName.BOOLEAN, false)
     .add("B", SqlTypeName.VARCHAR(10), true)
     .add("C", SqlTypeName.DECIMAL, 6, 2, false)
     .type();
 

The equivalent conventional code is:

 RelDataTypeFactory typeFactory;
 String[] names = {"A", "B", "C"};
 RelDataType[] types = {
     typeFactory.createSqlType(SqlTypeName.BOOLEAN),
     typeFactory.createTypeWithNullability(
         typeFactory.createSqlType(SqlTypeName.VARCHAR, 10),
         true),
    typeFactory.createSqlType(SqlTypeName.DECIMAL, 6, 2)
 };
 return typeFactory.createStructType(names, types);
 

Field Summary

private List<RelDataTypeFieldImpl>	fieldList
private RelDataTypeFactory	typeFactory

Constructor Summary

SqlTypeUtil.TypeBuilder(RelDataTypeFactory typeFactory)

Method Summary

SqlTypeUtil.TypeBuilder	add(String name, SqlTypeName typeName, boolean nullable)
SqlTypeUtil.TypeBuilder	add(String name, SqlTypeName typeName, int precision, boolean nullable)
SqlTypeUtil.TypeBuilder	add(String name, SqlTypeName typeName, int precision, int scale, boolean nullable)
RelDataType	type()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

fieldList

private final List<RelDataTypeFieldImpl> fieldList

typeFactory

private final RelDataTypeFactory typeFactory

Constructor Detail

SqlTypeUtil.TypeBuilder

public SqlTypeUtil.TypeBuilder(RelDataTypeFactory typeFactory)

Method Detail

add

public SqlTypeUtil.TypeBuilder add(String name,
                                   SqlTypeName typeName,
                                   boolean nullable)

add

public SqlTypeUtil.TypeBuilder add(String name,
                                   SqlTypeName typeName,
                                   int precision,
                                   boolean nullable)

add

public SqlTypeUtil.TypeBuilder add(String name,
                                   SqlTypeName typeName,
                                   int precision,
                                   int scale,
                                   boolean nullable)

type

public RelDataType type()