aai-core/src/main/java/org/openecomp/aai/serialization/queryformats/utils/QueryParamInjector.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * org.openecomp.aai
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * ================================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END=========================================================
  19  */
  20
  21 package org.openecomp.aai.serialization.queryformats.utils;
  22
  23 import java.lang.reflect.InvocationTargetException;
  24 import java.lang.reflect.Method;
  25 import java.util.Set;
  26
  27 import javax.ws.rs.core.MultivaluedMap;
  28
  29 import org.openecomp.aai.serialization.queryformats.exceptions.QueryParamInjectionException;
  30 import org.openecomp.aai.serialization.queryformats.params.Inject;
  31 import org.openecomp.aai.serialization.queryformats.params.Setter;
  32 import org.reflections.Reflections;
  33
  34 public class QueryParamInjector {
  35
  36         private final Set<Class<?>> results;
  37
  38
  39         private QueryParamInjector () {
  40                 Reflections reflections = new Reflections("org.openecomp.aai.serialization.queryformats.params");
  41                 results = reflections.getTypesAnnotatedWith(Inject.class);
  42         }
  43
  44         private static class Helper {
  45                 private static final QueryParamInjector INSTANCE = new QueryParamInjector();
  46         }
  47
  48         public static QueryParamInjector getInstance() {
  49                 return Helper.INSTANCE;
  50         }
  51
  52         public <T> T injectParams(T obj, MultivaluedMap<String, String> params) throws QueryParamInjectionException{
  53                 try {
  54                         for (Class<?> item : results) {
  55                                 if (item.isAssignableFrom(obj.getClass())) {
  56                                         String name = item.getAnnotation(Inject.class).name();
  57
  58                                         if (params.containsKey(name)) {
  59                                                 String value = params.getFirst(name);
  60
  61                                                 for (Method method : item.getMethods()) {
  62                                                         if (method.isAnnotationPresent(Setter.class)) {
  63                                                                 Class<?>[] args = method.getParameterTypes();
  64                                                                 if (args.length == 1) {
  65                                                                         Object o = args[0].getConstructor(String.class).newInstance(value);
  66                                                                         method.invoke(obj, o);
  67                                                                 } else {
  68                                                                         method.invoke(obj);
  69                                                                 }
  70                                                         }
  71                                                 }
  72                                         }
  73                                 }
  74                         }
  75         } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
  76                                                                                         | InvocationTargetException | NoSuchMethodException
  77                                                                                         | SecurityException e) {
  78                 throw new QueryParamInjectionException("issue with query params", e);
  79         }
  80
  81
  82                 return obj;
  83         }
  84 }