Move SLC Core

[gpl/argeo-slc.git] / org.argeo.slc.core / src / org / argeo / slc / core / execution / ParameterRef.java

diff --git a/org.argeo.slc.core/src/org/argeo/slc/core/execution/ParameterRef.java b/org.argeo.slc.core/src/org/argeo/slc/core/execution/ParameterRef.java
new file mode 100644 (file)
index 0000000..5a9d9ad
--- /dev/null
+++ b/org.argeo.slc.core/src/org/argeo/slc/core/execution/ParameterRef.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.slc.core.execution;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.springframework.beans.factory.FactoryBean;
+
+public class ParameterRef implements FactoryBean {
+       private final static Log log = LogFactory.getLog(ParameterRef.class);
+
+       private InstantiationManager instantiationManager;
+       private String name;
+
+       /** Cached object. */
+       private Object object;
+
+       public ParameterRef() {
+       }
+
+       public ParameterRef(String name) {
+               this.name = name;
+       }
+
+       public Object getObject() throws Exception {
+               if (log.isTraceEnabled())
+                       log.debug("Parameter ref called for " + name);
+
+               if (object == null)
+                       object = instantiationManager.getInitializingFlowParameter(name);
+               return object;
+       }
+
+       public Class<?> getObjectType() {
+               if (object == null)
+                       return instantiationManager.getInitializingFlowParameterClass(name);
+               else
+                       return object.getClass();
+       }
+
+       public boolean isSingleton() {
+               return true;
+       }
+
+       public void setInstantiationManager(
+                       InstantiationManager instantiationManager) {
+               this.instantiationManager = instantiationManager;
+       }
+
+       public void setName(String name) {
+               this.name = name;
+       }
+
+}