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 java.lang.reflect.Method;
024import java.util.Collection;
025
026import org.apache.commons.lang3.StringUtils;
027
028import ca.uhn.fhir.context.ConfigurationException;
029import ca.uhn.fhir.model.primitive.IntegerDt;
030import ca.uhn.fhir.parser.DataFormatException;
031import ca.uhn.fhir.rest.annotation.Offset;
032import ca.uhn.fhir.rest.annotation.Since;
033import ca.uhn.fhir.rest.api.Constants;
034import ca.uhn.fhir.rest.api.server.RequestDetails;
035import ca.uhn.fhir.rest.param.ParameterUtil;
036import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
037import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
038
039public class OffsetParameter implements IParameter {
040
041        private Class<?> myType;
042
043        @Override
044        public Object translateQueryParametersIntoServerArgument(RequestDetails theRequest, BaseMethodBinding<?> theMethodBinding) throws InternalErrorException, InvalidRequestException {
045                String[] sinceParams = theRequest.getParameters().get(Constants.PARAM_OFFSET);
046                if (sinceParams != null) {
047                        if (sinceParams.length > 0) {
048                                if (StringUtils.isNotBlank(sinceParams[0])) {
049                                        try {
050                                                IntegerDt since = new IntegerDt(sinceParams[0]);
051                                                return ParameterUtil.fromInteger(myType, since);
052                                        } catch (DataFormatException e) {
053                                                throw new InvalidRequestException("Invalid " + Constants.PARAM_OFFSET + " value: " + sinceParams[0]);
054                                        }
055                                }
056                        }
057                }
058                return ParameterUtil.fromInteger(myType, null);
059        }
060
061        @Override
062        public void initializeTypes(Method theMethod, Class<? extends Collection<?>> theOuterCollectionType, Class<? extends Collection<?>> theInnerCollectionType, Class<?> theParameterType) {
063                if (theOuterCollectionType != null) {
064                        throw new ConfigurationException("Method '" + theMethod.getName() + "' in type '" +theMethod.getDeclaringClass().getCanonicalName()+ "' is annotated with @" + Offset.class.getName() + " but can not be of collection type");
065                }
066                if (!ParameterUtil.isBindableIntegerType(theParameterType)) {
067                        throw new ConfigurationException("Method '" + theMethod.getName() + "' in type '" +theMethod.getDeclaringClass().getCanonicalName()+ "' is annotated with @" + Offset.class.getName() + " but type '" + theParameterType + "' is an invalid type, must be one of Integer or IntegerType");
068                }
069                myType = theParameterType;
070        }
071
072}