/******************************************************************************* * Copyright (c) 2015, 2016 David Green. * * 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. *******************************************************************************/ package com.greensopinion.finance.services.web.dispatch; import static com.google.common.base.Preconditions.checkNotNull; import java.lang.annotation.Annotation; import java.lang.reflect.AnnotatedType; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.Type; import java.util.List; import java.util.Map; import javax.ws.rs.PathParam; import com.google.common.base.Throwables; import com.google.common.collect.ImmutableList; import com.google.common.collect.ImmutableMap; class Handler { static final String NAME_ENTITY = "<request-entity>"; private final Object webService; private final Method method; private List<String> parameterOrder; private Map<String, Type> parameterNameToType; public Handler(Object webService, Method method) { this.webService = checkNotNull(webService); this.method = checkNotNull(method); compileParameters(method.getAnnotatedParameterTypes(), method.getParameterAnnotations()); } public Map<String, Type> getParameterNameToType() { return parameterNameToType; } public Object invoke(Map<String, Object> parameters) throws Exception { Object[] params = new Object[parameterOrder.size()]; for (int x = 0; x < parameterOrder.size(); ++x) { String parameterName = parameterOrder.get(x); params[x] = parameters.get(parameterName); } try { return method.invoke(webService, params); } catch (InvocationTargetException e) { throw Throwables.propagate(e.getCause()); } } private void compileParameters(AnnotatedType[] annotatedParameterTypes, Annotation[][] annotations) { ImmutableList.Builder<String> parameterOrderBuilder = ImmutableList.builder(); ImmutableMap.Builder<String, Type> nameToTypeBuilder = ImmutableMap.builder(); for (int x = 0; x < annotatedParameterTypes.length; ++x) { AnnotatedType annotatedType = annotatedParameterTypes[x]; PathParam pathParam = getPathParam(annotations[x]); String name; Type type; if (pathParam != null) { name = pathParam.value(); type = annotatedType.getType(); } else { name = NAME_ENTITY; type = annotatedType.getType(); } parameterOrderBuilder.add(name); nameToTypeBuilder.put(name, type); } parameterOrder = parameterOrderBuilder.build(); parameterNameToType = nameToTypeBuilder.build(); } private PathParam getPathParam(Annotation[] annotations) { for (Annotation annotation : annotations) { if (PathParam.class == annotation.annotationType()) { return (PathParam) annotation; } } return null; } }