runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/ParameterRef.java

   1 package org.argeo.slc.core.execution;
   2
   3 import org.apache.commons.logging.Log;
   4 import org.apache.commons.logging.LogFactory;
   5 import org.springframework.beans.factory.FactoryBean;
   6
   7 public class ParameterRef implements FactoryBean {
   8         private final static Log log = LogFactory.getLog(ParameterRef.class);
   9
  10         private InstantiationManager instantiationManager;
  11         private String name;
  12
  13         /** Cached object. */
  14         private Object object;
  15
  16         public ParameterRef() {
  17         }
  18
  19         /** @deprecated for backward compatibility with pre v0.11.4 approach. */
  20         public ParameterRef(String name) {
  21                 this.name = name;
  22         }
  23
  24         public Object getObject() throws Exception {
  25                 if (log.isTraceEnabled())
  26                         log.debug("Parameter ref called for " + name);
  27
  28                 if (object == null)
  29                         object = instantiationManager.getInitializingFlowParameter(name);
  30                 return object;
  31         }
  32
  33         public Class<?> getObjectType() {
  34                 if (object == null)
  35                         return instantiationManager.getInitializingFlowParameterClass(name);
  36                 else
  37                         return object.getClass();
  38         }
  39
  40         public boolean isSingleton() {
  41                 return true;
  42         }
  43
  44         public void setInstantiationManager(
  45                         InstantiationManager instantiationManager) {
  46                 this.instantiationManager = instantiationManager;
  47         }
  48
  49         public void setName(String name) {
  50                 this.name = name;
  51         }
  52
  53 }