Create a spring like wiring class - spring

Question

I want to create a bean that will act as a provider.
I will give it the class that it should return and the list of properties that I should set before returning it.
so basically it looks like this:
<bean id="somethingFactory" class="foo.bar.SomethingFactory">
<property name="implClass" value="foo.bar.SomehtingImpl" />
<property name="properties">
<props>
<prop key="prop1">prop1Value</prop>
<prop key="prop2">prop2Value</prop>
</props>
</property>
</bean>
The "SomethingFactory" has a provide() method that will return an instance of "SomehtingImpl".
The question is how can I use Spring to do it?

Answer 1

Make SomethingFactory a FactoryBean, extend AbstractFactoryBean and use a BeanWrapper to populate the properties from the input parameters.
Here's a sample implementation:
public class ServiceFactoryBean<T> extends AbstractFactoryBean<T> {
private Class<T> serviceType;
private Class<? extends T> implementationClass;
private Map<String, Object> beanProperties;
#Override
public void afterPropertiesSet() {
if (serviceType == null || implementationClass == null
|| !serviceType.isAssignableFrom(implementationClass)) {
throw new IllegalStateException();
}
}
#Override
public Class<?> getObjectType() {
return serviceType;
}
public void setBeanProperties(final Map<String, Object> beanProperties) {
this.beanProperties = beanProperties;
}
public void setImplementationClass(
final Class<? extends T> implementationClass) {
this.implementationClass = implementationClass;
}
public void setServiceType(final Class<T> serviceType) {
this.serviceType = serviceType;
}
#Override
protected T createInstance() throws Exception {
final T instance = implementationClass.newInstance();
if (beanProperties != null && !beanProperties.isEmpty()) {
final BeanWrapper wrapper = new BeanWrapperImpl(instance);
wrapper.setPropertyValues(beanProperties);
}
return instance;
}
}