001package ca.uhn.fhir.rest.server.method;
002
003/*
004 * #%L
005 * HAPI FHIR - Server Framework
006 * %%
007 * Copyright (C) 2014 - 2022 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import ca.uhn.fhir.i18n.Msg;
024import ca.uhn.fhir.context.ConfigurationException;
025import ca.uhn.fhir.model.primitive.IntegerDt;
026import ca.uhn.fhir.parser.DataFormatException;
027import ca.uhn.fhir.rest.annotation.Count;
028import ca.uhn.fhir.rest.api.Constants;
029import ca.uhn.fhir.rest.api.server.RequestDetails;
030import ca.uhn.fhir.rest.param.ParameterUtil;
031import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
032import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
033import org.apache.commons.lang3.StringUtils;
034
035import java.lang.reflect.Method;
036import java.util.Collection;
037
038public class CountParameter implements IParameter {
039
040        private Class<?> myType;
041
042        @Override
043        public Object translateQueryParametersIntoServerArgument(RequestDetails theRequest, BaseMethodBinding<?> theMethodBinding) throws InternalErrorException, InvalidRequestException {
044                String[] countParam = theRequest.getParameters().get(Constants.PARAM_COUNT);
045                if (countParam != null) {
046                        if (countParam.length > 0) {
047                                if (StringUtils.isNotBlank(countParam[0])) {
048                                        try {
049                                                IntegerDt count = new IntegerDt(countParam[0]);
050                                                return ParameterUtil.fromInteger(myType, count);
051                                        } catch (DataFormatException e) {
052                                                throw new InvalidRequestException(Msg.code(375) + "Invalid " + Constants.PARAM_COUNT + " value: " + countParam[0]);
053                                        }
054                                }
055                        }
056                }
057                return null;
058        }
059
060        @Override
061        public void initializeTypes(Method theMethod, Class<? extends Collection<?>> theOuterCollectionType, Class<? extends Collection<?>> theInnerCollectionType, Class<?> theParameterType) {
062                if (theOuterCollectionType != null) {
063                        throw new ConfigurationException(Msg.code(376) + "Method '" + theMethod.getName() + "' in type '" +theMethod.getDeclaringClass().getCanonicalName()+ "' is annotated with @" + Count.class.getName() + " but can not be of collection type");
064                }
065                if (!ParameterUtil.isBindableIntegerType(theParameterType)) {
066                        throw new ConfigurationException(Msg.code(377) + "Method '" + theMethod.getName() + "' in type '" +theMethod.getDeclaringClass().getCanonicalName()+ "' is annotated with @" + Count.class.getName() + " but type '" + theParameterType + "' is an invalid type, must be one of Integer or IntegerType");
067                }
068                myType = theParameterType;
069        }
070
071}