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                 log
  23                                 .warn("Using constructor in parameter ref is deprecated"
  24                                                 + " and will be removed in a later version. Set with property 'name'.");
  25         }
  26
  27         public Object getObject() throws Exception {
  28                 if (log.isTraceEnabled())
  29                         log.debug("Parameter ref called for " + name);
  30
  31                 if (object == null)
  32                         object = instantiationManager.getInitializingFlowParameter(name);
  33                 return object;
  34         }
  35
  36         public Class<?> getObjectType() {
  37                 if (object == null)
  38                         return instantiationManager.getInitializingFlowParameterClass(name);
  39                 else
  40                         return object.getClass();
  41         }
  42
  43         public boolean isSingleton() {
  44                 return true;
  45         }
  46
  47         public void setInstantiationManager(
  48                         InstantiationManager instantiationManager) {
  49                 this.instantiationManager = instantiationManager;
  50         }
  51
  52         public void setName(String name) {
  53                 this.name = name;
  54         }
  55
  56 }