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Collections and custom types
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you ve probably noticed, you re using an inner class of the Hibernate object: STRING. Since your Address object just contains Strings, you re going to use Hibernate s existing functionality rather than performing your own null checking. Once the object is populated, it is returned:
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public Object nullSafeGet(ResultSet rs, String[] names, Object o) throws HibernateException, SQLException { Address addr = (Address) o; addr.setStreetAddress((String) Hibernate.STRING.nullSafeGet(rs, addr.setCity((String) Hibernate.STRING.nullSafeGet(rs, addr.setState((String) Hibernate.STRING.nullSafeGet(rs, addr.setZipCode((String) Hibernate.STRING.nullSafeGet(rs, return addr; }
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names[0])); names[1])); names[2])); names[3]));
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Next let s look at nullSafeGet( ), the partner method to nullSafeGet( ):
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public void nullSafeSet(PreparedStatement ps, Object o, int i) throws HibernateException, SQLException { Address addr = (Address) o; Hibernate.STRING.nullSafeSet(ps, Hibernate.STRING.nullSafeSet(ps, Hibernate.STRING.nullSafeSet(ps, Hibernate.STRING.nullSafeSet(ps, }
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addr.getStreetAddress(), i); addr.getCity(), i+1); addr.getState(), i+2); addr.getZipCode(), i+3);
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Since the nullSafeGet( ) method populates an object from a Resultit makes sense that the nullSafeSet( ) method performs the opposite task and populates a PreparedStatement from an Address instance. Here you ve set four properties on the PreparedStatement, incrementing the index variable, i, each time. Again you re using the
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Implementing custom types
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Hibernate.STRING
class to check for null values when populating the
statement. This leaves you with the deepCopy(Object) method:
public Object deepCopy(Object o) throws HibernateException { if (o == null) return null; Address origAddr = (Address) o; Address newAddr = new Address(); String streetAddr = new String(origAddr.getStreetAddress()); newAddr.setStreetAddress(streetAddr); newAddr.setCity(new String(origAddr.getCity())); newAddr.setState(new String(origAddr.getState())); newAddr.setZipCode(new String(origAddr.getZipCode())); return newAddr; }
The deepCopy(Object) method returns a copy of the persistent state of the object. Persistent object associations and collections are not copied in this method; it copies only the persistent properties of the object. It is important to create a correct implementation of this method to avoid threading problems, with multiple objects referring to the same objects in memory. When you create a deep copy of an object, not only do you copy the object, but you also copy all of the objects referred to by that object. This is different than the Object s clone() method, which only performs a shallow copy. A shallow copy does not create a new copy of the referred objects. Since object graphs can be quite large, creating a deep copy correctly can be difficult. With your AddressType created, you need to update the mapping definition file to use it.
Using UserTypes
Now that you have the completed AddressType class, how do you use it Like most things related to persistent classes and Hibernate, you edit the mapping definition to inform it of the UserType implementation:
Collections and custom types
<property name="address" type="AddressType"/>
And that s it. If your UserType maps to multiple database columns, you can use the column element to specify the columns to use in the relational table:
<property name="address" type="AddressType"> <column name="street_address"/> <column name="city"/> <column name="state"/> <column name="zip_code"/> </property>
Now that we ve reviewed the UserType interface, let s examine a slightly more complicated, and interesting, interface: CompositeUserType.
5.2.2 Implementing CompositeUserTypes
There are two primary differences between UserType and CompositeUserType. First, the class bridged by the CompositeUserType does not need to implement the java.io.Serializable interface to be cachable by a caching service. Second, you are able to query on properties of the bridged class, allowing for a great deal of flexibility in HQL statements. The more interesting feature of the CompositeUserType interface is the ability to query properties of the persisted object. Suppose we implemented the CompositeUserType interface for our Address class instead of UserType. Let s examine our new class, shown in listing 5.5. Note that we ve omitted methods that are identical to the AddressType, shown in listing 5.4. Listing 5.5 The CompositeAddressType class
package com.manning.hq.ch05; import java.io.Serializable; // .. AddressType imports omitted import org.hibernate.usertype.CompositeUserType;
Implementing custom types
import org.hibernate.engine.SessionImplementor; import org.hibernate.type.Type; public class CompositeAddressType implements CompositeUserType { // .. AddressType methods omitted private String[] propertyNames = {"streetAddress", "city", "state", "zipCode"}; private Type[] propertyTypes = {Hibernate.STRING, Hibernate.STRING, Hibernate.STRING, Hibernate.STRING}; public String[] getPropertyNames() { return propertyNames; } public Type[] getPropertyTypes() { return propertyTypes; } public Object getPropertyValue(Object component, int property) { Address addr = (Address) component; switch (property) { case 0: return addr.getStreetAddress(); case 1: return addr.getState(); case 2: return addr.getState(); case 3: return addr.getZipCode(); } throw new IllegalArgumentException(property + " is an invalid property index for class type " + component.getClass().getName()); } public void setPropertyValue(Object component, int property, Object value) { Address addr = (Address) component; String propertyValue = (String) value;
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