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

   1 /*
   2  * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.argeo.slc.core.execution;
  18
  19 import org.apache.commons.logging.Log;
  20 import org.apache.commons.logging.LogFactory;
  21 import org.springframework.beans.factory.FactoryBean;
  22
  23 public class ParameterRef implements FactoryBean {
  24         private final static Log log = LogFactory.getLog(ParameterRef.class);
  25
  26         private InstantiationManager instantiationManager;
  27         private String name;
  28
  29         /** Cached object. */
  30         private Object object;
  31
  32         public ParameterRef() {
  33         }
  34
  35         public ParameterRef(String name) {
  36                 this.name = name;
  37         }
  38
  39         public Object getObject() throws Exception {
  40                 if (log.isTraceEnabled())
  41                         log.debug("Parameter ref called for " + name);
  42
  43                 if (object == null)
  44                         object = instantiationManager.getInitializingFlowParameter(name);
  45                 return object;
  46         }
  47
  48         public Class<?> getObjectType() {
  49                 if (object == null)
  50                         return instantiationManager.getInitializingFlowParameterClass(name);
  51                 else
  52                         return object.getClass();
  53         }
  54
  55         public boolean isSingleton() {
  56                 return true;
  57         }
  58
  59         public void setInstantiationManager(
  60                         InstantiationManager instantiationManager) {
  61                 this.instantiationManager = instantiationManager;
  62         }
  63
  64         public void setName(String name) {
  65                 this.name = name;
  66         }
  67
  68 }