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1   /**
2    * The contents of this file are subject to the Mozilla Public License Version 1.1
3    * (the "License"); you may not use this file except in compliance with the License.
4    * You may obtain a copy of the License at http://www.mozilla.org/MPL/
5    * Software distributed under the License is distributed on an "AS IS" basis,
6    * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
7    * specific language governing rights and limitations under the License.
8    *
9    * The Original Code is "ReflectionUtil.java".  Description:
10   * "Utility class for reflection"
11   *
12   * The Initial Developer of the Original Code is University Health Network. Copyright (C)
13   * 2001.  All Rights Reserved.
14   *
15   * Contributor(s): 
16   *
17   * Alternatively, the contents of this file may be used under the terms of the
18   * GNU General Public License (the  �GPL�), in which case the provisions of the GPL are
19   * applicable instead of those above.  If you wish to allow use of your version of this
20   * file only under the terms of the GPL and not to allow others to use your version
21   * of this file under the MPL, indicate your decision by deleting  the provisions above
22   * and replace  them with the notice and other provisions required by the GPL License.
23   * If you do not delete the provisions above, a recipient may use your version of
24   * this file under either the MPL or the GPL.
25   *
26   */
27  package ca.uhn.hl7v2.util;
28  
29  import java.lang.reflect.Constructor;
30  
31  import ca.uhn.hl7v2.HL7Exception;
32  import ca.uhn.hl7v2.model.Group;
33  import ca.uhn.hl7v2.model.Structure;
34  import ca.uhn.hl7v2.parser.ModelClassFactory;
35  
36  public class ReflectionUtil {
37  
38      /** Non instantiable */
39      private ReflectionUtil() {
40          // nothing
41      }
42  
43      public static <T extends Structure> T instantiateStructure(Class<T> theType, Group parent,
44              ModelClassFactory theModelClassFactory) throws HL7Exception {
45          try {
46              Constructor<T> constructor = theType.getConstructor(new Class<?>[] { Group.class,
47                      ModelClassFactory.class });
48              T message = constructor.newInstance(parent, theModelClassFactory);
49              return message;
50          } catch (Exception e) {
51              throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
52                      + ": ", e);
53          }
54      }
55  
56      public static <T extends Structure> T instantiateMessage(Class<T> theType,
57              ModelClassFactory theModelClassFactory) throws HL7Exception {
58          try {
59              Constructor<T> constructor = theType
60                      .getConstructor(new Class<?>[] { ModelClassFactory.class });
61              T message = constructor.newInstance(theModelClassFactory);
62              return message;
63          } catch (Exception e) {
64              throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
65                      + ": ", e);
66          }
67      }
68  
69      public static <T> T instantiate(Class<T> theType) throws HL7Exception {
70          try {
71              return theType.newInstance();
72          } catch (Exception e) {
73              throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
74                      + ": ", e);
75          }
76      }
77  
78  }