001/*
002 * #%L
003 * HAPI FHIR - Client Framework
004 * %%
005 * Copyright (C) 2014 - 2023 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.rest.client.impl;
021
022import ca.uhn.fhir.i18n.Msg;
023import java.lang.reflect.Method;
024import java.util.HashMap;
025import java.util.Map;
026
027import org.hl7.fhir.instance.model.api.IBaseResource;
028
029import ca.uhn.fhir.context.ConfigurationException;
030import ca.uhn.fhir.context.FhirContext;
031import ca.uhn.fhir.rest.api.EncodingEnum;
032import ca.uhn.fhir.rest.api.SummaryEnum;
033import ca.uhn.fhir.rest.client.api.IClientInterceptor;
034import ca.uhn.fhir.rest.client.api.IHttpClient;
035import ca.uhn.fhir.rest.client.api.IRestfulClient;
036import ca.uhn.fhir.rest.client.method.BaseMethodBinding;
037
038public class ClientInvocationHandlerFactory {
039
040        private final Map<Method, BaseMethodBinding<?>> myBindings = new HashMap<Method, BaseMethodBinding<?>>();
041        private final IHttpClient myClient;
042        private final FhirContext myContext;
043        private final Map<Method, ILambda> myMethodToLambda = new HashMap<Method, ILambda>();
044        private final Map<Method, Object> myMethodToReturnValue = new HashMap<Method, Object>();
045        private final String myUrlBase;
046
047        public ClientInvocationHandlerFactory(IHttpClient theClient, FhirContext theContext, String theUrlBase, Class<? extends IRestfulClient> theClientType) {
048                myClient = theClient;
049                myUrlBase = theUrlBase;
050                myContext = theContext;
051
052                try {
053                        myMethodToReturnValue.put(theClientType.getMethod("getFhirContext"), theContext);
054                        myMethodToReturnValue.put(theClientType.getMethod("getHttpClient"), theClient);
055                        myMethodToReturnValue.put(theClientType.getMethod("getServerBase"), theUrlBase);
056
057                        myMethodToLambda.put(theClientType.getMethod("setEncoding", EncodingEnum.class), new SetEncodingLambda());
058                        myMethodToLambda.put(theClientType.getMethod("setPrettyPrint", Boolean.class), new SetPrettyPrintLambda());
059                        myMethodToLambda.put(theClientType.getMethod("registerInterceptor", Object.class), new RegisterInterceptorLambda());
060                        myMethodToLambda.put(theClientType.getMethod("unregisterInterceptor", Object.class), new UnregisterInterceptorLambda());
061                        myMethodToLambda.put(theClientType.getMethod("setSummary", SummaryEnum.class), new SetSummaryLambda());
062                        myMethodToLambda.put(theClientType.getMethod("fetchResourceFromUrl", Class.class, String.class), new FetchResourceFromUrlLambda());
063
064                } catch (NoSuchMethodException e) {
065                        throw new ConfigurationException(Msg.code(1352) + "Failed to find methods on client. This is a HAPI bug!", e);
066                } catch (SecurityException e) {
067                        throw new ConfigurationException(Msg.code(1353) + "Failed to find methods on client. This is a HAPI bug!", e);
068                }
069        }
070
071        public void addBinding(Method theMethod, BaseMethodBinding<?> theBinding) {
072                myBindings.put(theMethod, theBinding);
073        }
074
075        ClientInvocationHandler newInvocationHandler(RestfulClientFactory theRestfulClientFactory) {
076                return new ClientInvocationHandler(myClient, myContext, myUrlBase, myMethodToReturnValue, myBindings, myMethodToLambda, theRestfulClientFactory);
077        }
078
079        public interface ILambda {
080                Object handle(ClientInvocationHandler theTarget, Object[] theArgs);
081        }
082
083        class RegisterInterceptorLambda implements ILambda {
084                @Override
085                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
086                        Object interceptor = theArgs[0];
087                        theTarget.registerInterceptor(interceptor);
088                        return null;
089                }
090        }
091        
092        class FetchResourceFromUrlLambda implements ILambda {
093                @Override
094                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
095                        @SuppressWarnings("unchecked")
096                        Class<? extends IBaseResource> type = (Class<? extends IBaseResource>) theArgs[0];
097                        String url = (String) theArgs[1];
098                        
099                        return theTarget.fetchResourceFromUrl(type, url);
100                }
101        }
102        
103        class SetEncodingLambda implements ILambda {
104                @Override
105                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
106                        EncodingEnum encoding = (EncodingEnum) theArgs[0];
107                        theTarget.setEncoding(encoding);
108                        return null;
109                }
110        }
111
112        class SetPrettyPrintLambda implements ILambda {
113                @Override
114                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
115                        Boolean prettyPrint = (Boolean) theArgs[0];
116                        theTarget.setPrettyPrint(prettyPrint);
117                        return null;
118                }
119        }
120
121        class SetSummaryLambda implements ILambda {
122                @Override
123                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
124                        SummaryEnum encoding = (SummaryEnum) theArgs[0];
125                        theTarget.setSummary(encoding);
126                        return null;
127                }
128        }
129
130        class UnregisterInterceptorLambda implements ILambda {
131                @Override
132                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
133                        Object interceptor = theArgs[0];
134                        theTarget.unregisterInterceptor(interceptor);
135                        return null;
136                }
137        }
138
139}