Within Spring DI, can you "use" your bean within it's own definition? For example, if I have a bean called getTest1 with an inner bean declared within it, can I pass getTest1 to the constructor of that inner bean?
I'm wondering if I can implement a decorator patter-like solution using Spring DI for a work project but don't have much time to play around with it. Thanks!
Haven't tested it but I think you need something like this
<bean id="a" class="com.AClass">
<property name="aProperty" value="y">
<property name="bean2">
<bean class="com.BClass">
<constructor-arg ref="a"/>
</bean>
</property>
</bean>
check here for more help on referencing one bean inside another
The decorator pattern can be expressed in the following way using XML:
<bean id="decorated" class="Outer">
<constructor-arg>
<bean class="Middle">
<constructor-arg>
<bean class="Inner"/>
</constructor-arg>
</bean>
</constructor-arg>
</bean>
This is equivalent to the following Java code:
Common decorated = new Outer(new Middle(new Inner()));
Consider Using @Configuration approach to make this more Java-friendly:
@Bean
public Common outer() {
return new Outer(middle());
}
@Bean
public Common middle() {
return new Middle(inner());
}
@Bean
public Common inner() {
return new Inner();
}
