Initial set of mappers initialized.
- By Frank Sauer
- April 24, 2001
COMPONENT JAVA
Applying Design Patterns to JDBC: Building a Lightweight Object-Relational Mapping Framework
Frank Sauer
Listing 3. Initial set of mappers initialized.
protected Mapper getMapper(Object key) {
if (mappers == null) {
mappers = new HashMap();
registerMapper(Byte.class,
Types.TINYINTnew ByteMapper());
DateMapper dm = new DateMapper();
registerMapper(java.util.Date.class,
Types.DATE, dm);
// always convert sql Dates to util
// Dates from ResultSets
registerMapper(java.sql.Date.class,
0, dm);
registerMapper(Double.class,
Types.DOUBLE,
new DoubleMapper());
registerMapper(Float.class, Types.FLOAT,
new FloatMapper());
registerMapper(Integer.class,
Types.INTEGER,
new IntMapper());
registerMapper(BigDecimal.class,
Types.NUMERIC,
new NumericMapper());
registerMapper(Long.class, Types.BIGINT,
new LongMapper());
registerMapper(Short.class,
Types.SMALLINT,
new ShortMapper());
StringMapper strm = new StringMapper();
registerMapper(String.class,
Types.VARCHAR, strm);
registerMapper(null, Types.LONGVARCHAR,
strm);
registerMapper(Time.class, Types.TIME,
new TimeMapper());
registerMapper(Timestamp.class,
Types.TIMESTAMP,
new TimestampMapper());
}
return (Mapper)mappers.get(key);
}