Chapter 7. Advanced Dependency Injection and IoC

<bean name="Binding" class="org.jboss.demos.ioc.vf.PortBindingManager">
  <constructor>
    <parameter>
      <map keyClass="java.lang.String" valueClass="java.lang.Integer">
	<entry>
	  <key>http</key>
	  <value>80</value>
	</entry>
	<entry>
	  <key>ssh</key>
	  <value>22</value>
	</entry>
      </map>
    </parameter>
  </constructor>
</bean>
<bean name="PortsConfig" class="org.jboss.demos.ioc.vf.PortsConfig">
  <property name="http"><value-factory bean="Binding" method="getPort" parameter="http"/></property>
  <property name="ssh"><value-factory bean="Binding" method="getPort" parameter="ssh"/></property>
  <property name="ftp">
    <value-factory bean="Binding" method="getPort">
      <parameter>ftp</parameter>
      <parameter>21</parameter>
    </value-factory>
  </property>
  <property name="mail">
    <value-factory bean="Binding" method="getPort">
      <parameter>mail</parameter>
      <parameter>25</parameter>
    </value-factory>
  </property>
</bean>
			
			
			

public class PortBindingManager {
    private Map<String, Integer> bindings;
    public PortBindingManager(Map<String, Integer> bindings)
    {
	this.bindings = bindings;
    }
    public Integer getPort(String key)
    {
	return getPort(key, null);
    }
    public Integer getPort(String key, Integer defaultValue)
    {
	if (bindings == null)
	    return defaultValue;
	Integer value = bindings.get(key);
	if (value != null)
	    return value;
	if (defaultValue != null)
	    bindings.put(key, defaultValue);
	return defaultValue;
    }
}