001package ca.uhn.fhir.rest.client;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2017 University Health Network
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.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.SummaryEnum;
032import ca.uhn.fhir.rest.client.api.IHttpClient;
033import ca.uhn.fhir.rest.client.api.IRestfulClient;
034import ca.uhn.fhir.rest.method.BaseMethodBinding;
035import ca.uhn.fhir.rest.server.EncodingEnum;
036
037public class ClientInvocationHandlerFactory {
038
039        private final Map<Method, BaseMethodBinding<?>> myBindings = new HashMap<Method, BaseMethodBinding<?>>();
040        private final IHttpClient myClient;
041        private final FhirContext myContext;
042        private final Map<Method, ILambda> myMethodToLambda = new HashMap<Method, ILambda>();
043        private final Map<Method, Object> myMethodToReturnValue = new HashMap<Method, Object>();
044        private final String myUrlBase;
045
046        public ClientInvocationHandlerFactory(IHttpClient theClient, FhirContext theContext, String theUrlBase, Class<? extends IRestfulClient> theClientType) {
047                myClient = theClient;
048                myUrlBase = theUrlBase;
049                myContext = theContext;
050
051                try {
052                        myMethodToReturnValue.put(theClientType.getMethod("getFhirContext"), theContext);
053                        myMethodToReturnValue.put(theClientType.getMethod("getHttpClient"), theClient);
054                        myMethodToReturnValue.put(theClientType.getMethod("getServerBase"), theUrlBase);
055
056                        myMethodToLambda.put(theClientType.getMethod("setEncoding", EncodingEnum.class), new SetEncodingLambda());
057                        myMethodToLambda.put(theClientType.getMethod("setPrettyPrint", Boolean.class), new SetPrettyPrintLambda());
058                        myMethodToLambda.put(theClientType.getMethod("registerInterceptor", IClientInterceptor.class), new RegisterInterceptorLambda());
059                        myMethodToLambda.put(theClientType.getMethod("unregisterInterceptor", IClientInterceptor.class), new UnregisterInterceptorLambda());
060                        myMethodToLambda.put(theClientType.getMethod("setSummary", SummaryEnum.class), new SetSummaryLambda());
061                        myMethodToLambda.put(theClientType.getMethod("fetchResourceFromUrl", Class.class, String.class), new FetchResourceFromUrlLambda());
062
063                } catch (NoSuchMethodException e) {
064                        throw new ConfigurationException("Failed to find methods on client. This is a HAPI bug!", e);
065                } catch (SecurityException e) {
066                        throw new ConfigurationException("Failed to find methods on client. This is a HAPI bug!", e);
067                }
068        }
069
070        public void addBinding(Method theMethod, BaseMethodBinding<?> theBinding) {
071                myBindings.put(theMethod, theBinding);
072        }
073
074        ClientInvocationHandler newInvocationHandler(RestfulClientFactory theRestfulClientFactory) {
075                return new ClientInvocationHandler(myClient, myContext, myUrlBase, myMethodToReturnValue, myBindings, myMethodToLambda, theRestfulClientFactory);
076        }
077
078        public interface ILambda {
079                Object handle(ClientInvocationHandler theTarget, Object[] theArgs);
080        }
081
082        class RegisterInterceptorLambda implements ILambda {
083                @Override
084                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
085                        IClientInterceptor interceptor = (IClientInterceptor) theArgs[0];
086                        theTarget.registerInterceptor(interceptor);
087                        return null;
088                }
089        }
090        
091        class FetchResourceFromUrlLambda implements ILambda {
092                @Override
093                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
094                        @SuppressWarnings("unchecked")
095                        Class<? extends IBaseResource> type = (Class<? extends IBaseResource>) theArgs[0];
096                        String url = (String) theArgs[1];
097                        
098                        return theTarget.fetchResourceFromUrl(type, url);
099                }
100        }
101        
102        class SetEncodingLambda implements ILambda {
103                @Override
104                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
105                        EncodingEnum encoding = (EncodingEnum) theArgs[0];
106                        theTarget.setEncoding(encoding);
107                        return null;
108                }
109        }
110
111        class SetPrettyPrintLambda implements ILambda {
112                @Override
113                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
114                        Boolean prettyPrint = (Boolean) theArgs[0];
115                        theTarget.setPrettyPrint(prettyPrint);
116                        return null;
117                }
118        }
119
120        class SetSummaryLambda implements ILambda {
121                @Override
122                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
123                        SummaryEnum encoding = (SummaryEnum) theArgs[0];
124                        theTarget.setSummary(encoding);
125                        return null;
126                }
127        }
128
129        class UnregisterInterceptorLambda implements ILambda {
130                @Override
131                public Object handle(ClientInvocationHandler theTarget, Object[] theArgs) {
132                        IClientInterceptor interceptor = (IClientInterceptor) theArgs[0];
133                        theTarget.unregisterInterceptor(interceptor);
134                        return null;
135                }
136        }
137
138}