package ca.uhn.fhir.rest.param.binder;
   
   /*
    * #%L
    * HAPI FHIR - Core Library
    * %%
    * Copyright (C) 2014 - 2018 University Health Network
    * %%
    * 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.
   * #L%
   */
  
  import static org.apache.commons.lang3.StringUtils.isBlank;
  
  import java.util.Collections;
  import java.util.List;
  
  import ca.uhn.fhir.context.FhirContext;
  import ca.uhn.fhir.model.api.IQueryParameterOr;
  import ca.uhn.fhir.rest.api.QualifiedParamList;
  import ca.uhn.fhir.rest.param.*;
  import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
  import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
  
  abstract class BaseJavaPrimitiveBinder<T>implements IParamBinder<T> {
  
  	public BaseJavaPrimitiveBinder() {
  		super();
  	}
  
  	protected abstract String doEncode(T theString);
  
  	protected abstract T doParse(String theString);
  
  	@SuppressWarnings("unchecked")
  	@Override
  	public List<IQueryParameterOr<?>> encode(FhirContext theContext, T theString) throws InternalErrorException {
  		String retVal = doEncode(theString);
  		if (isBlank(retVal)) {
  			return Collections.emptyList();
  		}
  		List<?> retValList = Collections.singletonList(ParameterUtil.singleton(new StringParam(retVal), null));
  		return (List<IQueryParameterOr<?>>) retValList;
  	}
  
  	@Override
  	public T parse(FhirContext theContext, String theName, List<QualifiedParamList> theParams) throws InternalErrorException, InvalidRequestException {
  		if (theParams.size() == 0 || theParams.get(0).size() == 0) {
  			return null;
  		}
  		if (theParams.size() > 1 || theParams.get(0).size() > 1) {
  			throw new InvalidRequestException("Multiple values detected for non-repeatable parameter '" + theName + "'. This server is not configured to allow multiple (AND) values for this param.");
  		}
  	
  		T value = doParse(theParams.get(0).get(0));
  		return value;
  	}
  
  }