001/**
002 * The contents of this file are subject to the Mozilla Public License Version 1.1
003 * (the "License"); you may not use this file except in compliance with the License.
004 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
005 * Software distributed under the License is distributed on an "AS IS" basis,
006 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
007 * specific language governing rights and limitations under the License.
008 *
009 * The Original Code is "ReflectionUtil.java".  Description:
010 * "Utility class for reflection"
011 *
012 * The Initial Developer of the Original Code is University Health Network. Copyright (C)
013 * 2001.  All Rights Reserved.
014 *
015 * Contributor(s): 
016 *
017 * Alternatively, the contents of this file may be used under the terms of the
018 * GNU General Public License (the  �GPL�), in which case the provisions of the GPL are
019 * applicable instead of those above.  If you wish to allow use of your version of this
020 * file only under the terms of the GPL and not to allow others to use your version
021 * of this file under the MPL, indicate your decision by deleting  the provisions above
022 * and replace  them with the notice and other provisions required by the GPL License.
023 * If you do not delete the provisions above, a recipient may use your version of
024 * this file under either the MPL or the GPL.
025 *
026 */
027package ca.uhn.hl7v2.util;
028
029import java.lang.reflect.Constructor;
030
031import ca.uhn.hl7v2.HL7Exception;
032import ca.uhn.hl7v2.model.Group;
033import ca.uhn.hl7v2.model.Message;
034import ca.uhn.hl7v2.model.Structure;
035import ca.uhn.hl7v2.parser.ModelClassFactory;
036
037public class ReflectionUtil {
038
039    /** Non instantiable */
040    private ReflectionUtil() {
041        // nothing
042    }
043
044    public static <T extends Structure> T instantiateStructure(Class<T> theType, Group parent,
045            ModelClassFactory theModelClassFactory) throws HL7Exception {
046        try {
047            Constructor<T> constructor = theType.getConstructor(new Class<?>[] { Group.class,
048                    ModelClassFactory.class });
049            T message = constructor.newInstance(parent, theModelClassFactory);
050            return message;
051        } catch (Exception e) {
052            throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
053                    + ": ", e);
054        }
055    }
056
057    public static <T extends Message> T instantiateMessage(Class<T> theType,
058            ModelClassFactory theModelClassFactory) throws HL7Exception {
059        try {
060            Constructor<T> constructor = theType
061                    .getConstructor(new Class<?>[] { ModelClassFactory.class });
062            T message = constructor.newInstance(theModelClassFactory);
063            return message;
064        } catch (Exception e) {
065            throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
066                    + ": ", e);
067        }
068    }
069
070    public static <T> T instantiate(Class<T> theType) throws HL7Exception {
071        try {
072            return theType.newInstance();
073        } catch (Exception e) {
074            throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
075                    + ": ", e);
076        }
077    }
078
079}