Java tutorial
package ca.uhn.fhir.jaxrs.server.util; /* * #%L * HAPI FHIR JAX-RS Server * %% * Copyright (C) 2014 - 2016 University Health Network * %% * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * #L% */ import java.lang.reflect.Method; import java.util.concurrent.ConcurrentHashMap; import org.apache.commons.lang3.StringUtils; import ca.uhn.fhir.jaxrs.server.AbstractJaxRsProvider; import ca.uhn.fhir.rest.annotation.Search; import ca.uhn.fhir.rest.api.RestOperationTypeEnum; import ca.uhn.fhir.rest.method.BaseMethodBinding; import ca.uhn.fhir.rest.method.OperationMethodBinding; import ca.uhn.fhir.rest.method.SearchMethodBinding; import ca.uhn.fhir.rest.server.exceptions.NotImplementedOperationException; import ca.uhn.fhir.util.ReflectionUtil; /** * Class that contains the method bindings defined by a ResourceProvider * * @author Peter Van Houte | peter.vanhoute@agfa.com | Agfa Healthcare */ public class JaxRsMethodBindings { /** DEFAULT_METHOD_KEY="" */ public static final String DEFAULT_METHOD_KEY = ""; /** Static collection of bindings mapped to a class*/ private static final ConcurrentHashMap<Class<?>, JaxRsMethodBindings> classBindings = new ConcurrentHashMap<Class<?>, JaxRsMethodBindings>(); /** Static collection of operationBindings mapped to a class */ private ConcurrentHashMap<RestOperationTypeEnum, ConcurrentHashMap<String, BaseMethodBinding<?>>> operationBindings = new ConcurrentHashMap<RestOperationTypeEnum, ConcurrentHashMap<String, BaseMethodBinding<?>>>(); /** * The constructor * @param theProvider the provider which is an implementation of the theProviderClass * @param theProviderClass the class definition contaning the operations */ public JaxRsMethodBindings(AbstractJaxRsProvider theProvider, Class<? extends AbstractJaxRsProvider> theProviderClass) { for (final Method m : ReflectionUtil.getDeclaredMethods(theProviderClass)) { final BaseMethodBinding<?> foundMethodBinding = BaseMethodBinding.bindMethod(m, theProvider.getFhirContext(), theProvider); if (foundMethodBinding == null) { continue; } String bindingKey = getBindingKey(foundMethodBinding); addMethodBinding(bindingKey, foundMethodBinding); } } /** * Get the key for the baseMethodBinding. This is: * <ul> * <li>the compartName for SearchMethodBindings * <li>the methodName for OperationMethodBindings * <li> {@link #DEFAULT_METHOD_KEY} for all other MethodBindings * </ul> * @param theBinding the methodbinding * @return the key for the methodbinding. */ private String getBindingKey(final BaseMethodBinding<?> theBinding) { if (theBinding instanceof OperationMethodBinding) { return ((OperationMethodBinding) theBinding).getName(); } else if (theBinding instanceof SearchMethodBinding) { Search search = theBinding.getMethod().getAnnotation(Search.class); return search.compartmentName(); } else { return DEFAULT_METHOD_KEY; } } private void addMethodBinding(String key, BaseMethodBinding<?> binding) { ConcurrentHashMap<String, BaseMethodBinding<?>> mapByOperation = getMapForOperation( binding.getRestOperationType()); if (mapByOperation.containsKey(key)) { throw new IllegalArgumentException("Multiple Search Method Bindings Found : " + mapByOperation.get(key) + " -- " + binding.getMethod()); } mapByOperation.put(key, binding); } /** * Get the map for the given operation type. If no map exists for this operation type, create a new hashmap for this * operation type and add it to the operation bindings. * * @param operationType the operation type. * @return the map defined in the operation bindings */ private ConcurrentHashMap<String, BaseMethodBinding<?>> getMapForOperation( RestOperationTypeEnum operationType) { ConcurrentHashMap<String, BaseMethodBinding<?>> result = operationBindings.get(operationType); if (result == null) { operationBindings.putIfAbsent(operationType, new ConcurrentHashMap<String, BaseMethodBinding<?>>()); return getMapForOperation(operationType); } else { return result; } } /** * Get the binding * * @param operationType the type of operation * @param theBindingKey the binding key * @return the binding defined * @throws NotImplementedOperationException cannot be found */ public BaseMethodBinding<?> getBinding(RestOperationTypeEnum operationType, String theBindingKey) { String bindingKey = StringUtils.defaultIfBlank(theBindingKey, DEFAULT_METHOD_KEY); ConcurrentHashMap<String, BaseMethodBinding<?>> map = operationBindings.get(operationType); if (map == null || !map.containsKey(bindingKey)) { throw new NotImplementedOperationException("Operation not implemented"); } else { return map.get(bindingKey); } } /** * Get the method bindings for the given class. If this class is not yet contained in the classBindings, they will be added for this class * * @param theProvider the implementation class * @param theProviderClass the provider class * @return the methodBindings for this class */ public static JaxRsMethodBindings getMethodBindings(AbstractJaxRsProvider theProvider, Class<? extends AbstractJaxRsProvider> theProviderClass) { if (!getClassBindings().containsKey(theProviderClass)) { JaxRsMethodBindings foundBindings = new JaxRsMethodBindings(theProvider, theProviderClass); getClassBindings().putIfAbsent(theProviderClass, foundBindings); } return getClassBindings().get(theProviderClass); } /** * @return the classBindings */ static ConcurrentHashMap<Class<?>, JaxRsMethodBindings> getClassBindings() { return classBindings; } }