ConceptDatatype
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package org.openmrs.customdatatype.datatype;

import org.apache.commons.lang.StringUtils;
import org.openmrs.Concept;
import org.openmrs.customdatatype.SerializingCustomDatatype;
import org.springframework.stereotype.Component;

/**
 * Datatype for Concept, represented by org.openmrs.Concept.
 * @since 1.9
 */
@Component
public class ConceptDatatype extends SerializingCustomDatatype<Concept>  {

	/**
	 * @see org.openmrs.customdatatype.SerializingCustomDatatype#doGetTextSummary(java.lang.Object)
	 */
	@Override
	public String serialize(Concept typedValue) {
		if (typedValue == null)
			return null;
		return typedValue.toString();
	}

	/**
	 * @see org.openmrs.customdatatype.SerializingCustomDatatype#doGetTextSummary(java.lang.Object)
	 */
	@Override
	public Concept deserialize(String serializedValue) {
		if (StringUtils.isEmpty(serializedValue))
			return null;
		return new Concept();
	}
}


ConceptDatatypeHandler
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/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.web.attribute.handler;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.StringUtils;
import org.openmrs.Concept;
import org.openmrs.api.context.Context;
import org.openmrs.customdatatype.CustomDatatype;
import org.openmrs.customdatatype.InvalidCustomValueException;
import org.openmrs.customdatatype.datatype.ConceptDatatype;
import org.openmrs.messagesource.MessageSourceService;
import org.springframework.stereotype.Component;

	/**
	 * Handler for the concept custom datatype
	 */
	@Component
	public class ConceptDatatypeHandler implements FieldGenDatatypeHandler<ConceptDatatype, Concept> {

		/**
		 * @see org.openmrs.customdatatype.CustomDatatypeHandler#setHandlerConfiguration(java.lang.String)
		 */
		@Override
		public void setHandlerConfiguration(String arg0) {
			// not used
		}

		/**
		 * @see org.openmrs.web.attribute.handler.FieldGenDatatypeHandler#getWidgetName()
		 */
		@Override
		public String getWidgetName() {
			return "concept";
		}

		/**
		 * @see org.openmrs.web.attribute.handler.FieldGenDatatypeHandler#getWidgetConfiguration()
		 */
		@Override
		public Map<String, Object> getWidgetConfiguration() {
			MessageSourceService mss = Context.getMessageSourceService();
			Map<String, Object> ret = new HashMap<String, Object>();
			ret.put("isNullable", "false");
			ret.put("trueLabel", mss.getMessage("general.true"));
			ret.put("falseLabel", mss.getMessage("general.false"));
			return ret;
		}

		/**
		 * @see org.openmrs.web.attribute.handler.FieldGenDatatypeHandler#getValue(org.openmrs.customdatatype.CustomDatatype, javax.servlet.http.HttpServletRequest, java.lang.String)
		 */
		@Override
		public Concept getValue(org.openmrs.customdatatype.datatype.ConceptDatatype datatype, HttpServletRequest request,
		        String formFieldName) throws InvalidCustomValueException {
			String result = request.getParameter(formFieldName);
			if (StringUtils.isBlank(result))
				return null;
			try {
				return new Concept();
			}
			catch (Exception e) {
				throw new InvalidCustomValueException("Invalid concept: " + result);
			}
		}

		/**
		 * @see org.openmrs.web.attribute.handler.HtmlDisplayableDatatypeHandler#toHtmlSummary(org.openmrs.customdatatype.CustomDatatype, java.lang.String)
		 */
		@Override
		public CustomDatatype.Summary toHtmlSummary(CustomDatatype<Concept> datatype, String valueReference) {
			return new CustomDatatype.Summary(valueReference, true);
		}

		/**
		 * @see org.openmrs.web.attribute.handler.HtmlDisplayableDatatypeHandler#toHtml(org.openmrs.customdatatype.CustomDatatype, java.lang.String)
		 */
		@Override
		public String toHtml(CustomDatatype<Concept> datatype, String valueReference) {
			return valueReference;
		}
}