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.Structure;
034import ca.uhn.hl7v2.parser.ModelClassFactory;
035
036public class ReflectionUtil {
037
038    /** Non instantiable */
039    private ReflectionUtil() {
040        // nothing
041    }
042
043    public static <T extends Structure> T instantiateStructure(Class<T> theType, Group parent,
044            ModelClassFactory theModelClassFactory) throws HL7Exception {
045        try {
046            Constructor<T> constructor = theType.getConstructor(new Class<?>[] { Group.class,
047                    ModelClassFactory.class });
048            T message = constructor.newInstance(parent, theModelClassFactory);
049            return message;
050        } catch (Exception e) {
051            throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
052                    + ": ", e);
053        }
054    }
055
056    public static <T extends Structure> T instantiateMessage(Class<T> theType,
057            ModelClassFactory theModelClassFactory) throws HL7Exception {
058        try {
059            Constructor<T> constructor = theType
060                    .getConstructor(new Class<?>[] { ModelClassFactory.class });
061            T message = constructor.newInstance(theModelClassFactory);
062            return message;
063        } catch (Exception e) {
064            throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
065                    + ": ", e);
066        }
067    }
068
069    public static <T> T instantiate(Class<T> theType) throws HL7Exception {
070        try {
071            return theType.newInstance();
072        } catch (Exception e) {
073            throw new HL7Exception("Failed to instantiate type " + theType.getCanonicalName()
074                    + ": ", e);
075        }
076    }
077
078}