wamblee.org Git - utils/blob - system/spring/src/main/java/org/wamblee/system/spring/RequiredServiceBean.java

   1 package org.wamblee.system.spring;
   2
   3 import org.springframework.beans.factory.FactoryBean;
   4 import org.wamblee.system.ProvidedInterface;
   5 import org.wamblee.system.RequiredInterface;
   6 import org.wamblee.system.SystemAssemblyException;
   7
   8 /**
   9  * Bean which adds a service required by the spring component to
  10  * the application context so that other spring beans can use it.
  11  *
  12  * @author Erik Brakkee
  13  */
  14 class RequiredServiceBean implements FactoryBean {
  15
  16         private RequiredInterface _required;
  17
  18         /**
  19          * Constructs the bean.
  20          * @param aId Id of the bean in the service registry.
  21          */
  22         public RequiredServiceBean(String aId) {
  23                 RequiredInterface[] required = SpringComponent.THIS.get().getRequiredServices();
  24                 for ( RequiredInterface intf: required) {
  25                         if ( intf.getName().equals(aId)) {
  26                                 _required = intf;
  27                                 return;
  28                         }
  29                 }
  30                 throw new SystemAssemblyException("Cannot resolve provided component '" + aId + "'");
  31         }
  32
  33         @Override
  34         public Object getObject() throws Exception {
  35                 return _required.getImplementation(Object.class);
  36         }
  37
  38         @Override
  39         public Class getObjectType() {
  40                 return null;
  41         }
  42
  43         @Override
  44         public boolean isSingleton() {
  45                 return true;
  46         }
  47
  48 }