[jboss-user] [Microcontainer] - Re: Injecting a field value

[alesj]

"david.lloyd at jboss.com" wrote : The most obvious mechanism to me is a ValueMetaData that is comprised of a class and a field name.
The most obvious is value-factory:

  |   <bean name="ConstantsProvider" class="org.jboss.demos.ioc.access.ConstantsProvider">
  |     <constructor>
  |       <parameter>org.jboss.demos.ioc.access.IConstants</parameter>
  |     </constructor>
  |   </bean>
  | 
  |   <bean name="XConstUser2" class="org.jboss.demos.ioc.access.XConstUser">
  |     <property name="x"><value-factory bean="ConstantsProvider" method="getConstant" parameter="X_INT_VALUE"/></property>
  |   </bean>
  | 
  | public class ConstantsProvider
  | {
  |    private KernelConfigurator configurator;
  |    private String className;
  |    private ClassInfo classInfo;
  | 
  |    public ConstantsProvider(String className)
  |    {
  |       this.className = className;
  |    }
  | 
  |    @Inject(bean = KernelConstants.KERNEL_CONFIGURATOR_NAME)
  |    public void setConfigurator(KernelConfigurator configurator)
  |    {
  |       this.configurator = configurator;
  |    }
  | 
  |    public void create() throws Throwable
  |    {
  |       if (configurator == null)
  |          throw new IllegalArgumentException("Null configurator");
  | 
  |       if (className != null)
  |          classInfo = configurator.getClassInfo(className, getClass().getClassLoader());
  |    }
  | 
  |    public Object getConstant(String constantName) throws Throwable
  |    {
  |       return getConstant(classInfo, constantName);
  |    }
  | 
  |    public Object getConstant(String className, String constantName) throws Throwable
  |    {
  |       ClassInfo classInfo = configurator.getClassInfo(className, getClass().getClassLoader());
  |       return getConstant(classInfo, constantName);
  |    }
  | 
  |    protected Object getConstant(ClassInfo classInfo, String constantName) throws Throwable
  |    {
  |       FieldInfo field = classInfo.getDeclaredField(constantName);
  |       return field.get(null);
  |    }
  | }
  | 

I can add this as part of Kernel,
probably next to BeanMetaDataBuilder.

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