001package ca.uhn.fhir.rest.server.method;
002
003/*
004 * #%L
005 * HAPI FHIR - Server Framework
006 * %%
007 * Copyright (C) 2014 - 2021 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.context.ConfigurationException;
024import ca.uhn.fhir.model.primitive.IntegerDt;
025import ca.uhn.fhir.parser.DataFormatException;
026import ca.uhn.fhir.rest.annotation.Count;
027import ca.uhn.fhir.rest.api.Constants;
028import ca.uhn.fhir.rest.api.server.RequestDetails;
029import ca.uhn.fhir.rest.param.ParameterUtil;
030import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
031import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
032import org.apache.commons.lang3.StringUtils;
033
034import java.lang.reflect.Method;
035import java.util.Collection;
036
037public class CountParameter implements IParameter {
038
039        private Class<?> myType;
040
041        @Override
042        public Object translateQueryParametersIntoServerArgument(RequestDetails theRequest, BaseMethodBinding<?> theMethodBinding) throws InternalErrorException, InvalidRequestException {
043                String[] countParam = theRequest.getParameters().get(Constants.PARAM_COUNT);
044                if (countParam != null) {
045                        if (countParam.length > 0) {
046                                if (StringUtils.isNotBlank(countParam[0])) {
047                                        try {
048                                                IntegerDt count = new IntegerDt(countParam[0]);
049                                                return ParameterUtil.fromInteger(myType, count);
050                                        } catch (DataFormatException e) {
051                                                throw new InvalidRequestException("Invalid " + Constants.PARAM_COUNT + " value: " + countParam[0]);
052                                        }
053                                }
054                        }
055                }
056                return null;
057        }
058
059        @Override
060        public void initializeTypes(Method theMethod, Class<? extends Collection<?>> theOuterCollectionType, Class<? extends Collection<?>> theInnerCollectionType, Class<?> theParameterType) {
061                if (theOuterCollectionType != null) {
062                        throw new ConfigurationException("Method '" + theMethod.getName() + "' in type '" +theMethod.getDeclaringClass().getCanonicalName()+ "' is annotated with @" + Count.class.getName() + " but can not be of collection type");
063                }
064                if (!ParameterUtil.isBindableIntegerType(theParameterType)) {
065                        throw new ConfigurationException("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");
066                }
067                myType = theParameterType;
068        }
069
070}