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Creating custom mapping types
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The nullSafeSet() method writes the property value to the JDBC PreparedStatement. This method takes whatever currency is set and converts it to a simple BigDecimal USD amount before saving. You now map the initialPrice property of Item as follows:
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<property name="initialPrice" column="INITIAL_PRICE" type="persistence.MonetaryAmountUserType"/>
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Note that you place the custom user type into the persistence package; it s part of the persistence layer of the application, not the domain model or business layer. To use a custom type in annotations, you have to add a Hibernate extension:
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@org.hibernate.annotations.Type( type = " persistence.MonetaryAmountUserType" ) @Column(name = "INITIAL_PRICE") private MonetaryAmount initialPrice;
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This is the simplest kind of transformation that a UserType can perform. Much more sophisticated things are possible. A custom mapping type can perform validation; it can read and write data to and from an LDAP directory; it can even retrieve persistent objects from a different database. You re limited mainly by your imagination. In reality, we d prefer to represent both the amount and currency of monetary amounts in the database, especially if the schema isn t legacy but can be defined (or updated quickly). Let s assume you now have two columns available and can store the MonetaryAmount without much conversion. A first option may again be a simple <component> mapping. However, let s try to solve it with a custom mapping type. (Instead of writing a new custom type, try to adapt the previous example for two columns. You can do this without changing the Java domain model classes only the converter needs to be updated for this new requirement and the additional column named in the mapping.) The disadvantage of a simple UserType implementation is that Hibernate doesn t know anything about the individual properties inside a MonetaryAmount. All it knows is the custom type class and the column names. The Hibernate query engine (discussed in more detail later) doesn t know how to query for amount or a particular currency.
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You write a CompositeUserType if you need the full power of Hibernate queries. This (slightly more complex) interface exposes the properties of the MonetaryAmount to Hibernate queries. We ll now map it again with this more flexible customization interface to two columns, effectively producing an equivalent to a component mapping.
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To demonstrate the flexibility of custom mappings types, you don t change the MonetaryAmount class (and other persistent classes) at all you change only the custom mapping type, as shown in listing 5.5.
Listing 5.5 Custom mapping type for monetary amounts in new database schemas
public class MonetaryAmountCompositeUserType implements CompositeUserType {
// public int[] sqlTypes()... public Class returnedClass... public boolean isMutable... public Object deepCopy... public Serializable disassemble... public Object assemble... public Object replace... public boolean equals... public int hashCode...
public Object nullSafeGet(ResultSet resultSet, String[] names, SessionImplementor session, Object owner) throws SQLException { BigDecimal value = resultSet.getBigDecimal( names[0] ); if (resultSet.wasNull()) return null; Currency currency = Currency.getInstance(resultSet.getString( names[1] ) ); return new MonetaryAmount(value, currency); } public void nullSafeSet(PreparedStatement statement, Object value, int index, SessionImplementor session) throws SQLException { if (value==null) { statement.setNull(index, Hibernate.BIG_DECIMAL.sqlType()); statement.setNull(index+1, Hibernate.CURRENCY.sqlType()); } else {
Creating custom mapping types
MonetaryAmount amount = (MonetaryAmount) value; String currencyCode = amount.getCurrency().getCurrencyCode(); statement.setBigDecimal( index, amount.getAmount() ); statement.setString( index+1, currencyCode ); } }
public String[] getPropertyNames() { return new String[] { "amount", "currency" }; } public Type[] getPropertyTypes() { return new Type[] { Hibernate.BIG_DECIMAL, Hibernate.CURRENCY }; } public Object getPropertyValue(Object component, int property) { MonetaryAmount monetaryAmount = (MonetaryAmount) component; if (property == 0) return monetaryAmount.getAmount(); else return monetaryAmount.getCurrency(); }
public void setPropertyValue(Object component, int property, Object value) { throw new UnsupportedOperationException("Immutable MonetaryAmount!"); } }
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The CompositeUserType interface requires the same housekeeping methods as the UserType you created earlier. However, the sqlTypes() method is no longer needed. Loading a value now is straightforward: You transform two column values in the result set to two property values in a new MonetaryAmount instance. Saving a value involves setting two parameters on the prepared statement. A CompositeUserType exposes the properties of the value type through getPropertyNames(). The properties each have their own type, as defined by getPropertyTypes(). The types of the SQL columns are now implicit from this method. The getPropertyValue() method returns the value of an individual property of the MonetaryAmount.
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