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

   1 /**
   2  * ============LICENSE_START=======================================================
   3  * org.onap.aai
   4  * ================================================================================
   5  * Copyright © 2017-2018 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 package org.onap.aai.serialization.queryformats.utils;
  21
  22 import java.lang.reflect.InvocationTargetException;
  23 import java.lang.reflect.Method;
  24 import java.util.Set;
  25
  26 import javax.ws.rs.core.MultivaluedMap;
  27
  28 import org.onap.aai.serialization.queryformats.exceptions.QueryParamInjectionException;
  29 import org.onap.aai.serialization.queryformats.params.Inject;
  30 import org.onap.aai.serialization.queryformats.params.Setter;
  31 import org.reflections.Reflections;
  32
  33 public class QueryParamInjector {
  34
  35         private final Set<Class<?>> results;
  36
  37
  38         private QueryParamInjector () {
  39                 Reflections reflections = new Reflections("org.onap.aai.serialization.queryformats.params");
  40                 results = reflections.getTypesAnnotatedWith(Inject.class);
  41         }
  42
  43         private static class Helper {
  44                 private static final QueryParamInjector INSTANCE = new QueryParamInjector();
  45         }
  46
  47         public static QueryParamInjector getInstance() {
  48                 return Helper.INSTANCE;
  49         }
  50
  51         public <T> T injectParams(T obj, MultivaluedMap<String, String> params) throws QueryParamInjectionException{
  52                 try {
  53                         for (Class<?> item : results) {
  54                                 if (item.isAssignableFrom(obj.getClass())) {
  55                                         String name = item.getAnnotation(Inject.class).name();
  56
  57                                         if (params.containsKey(name)) {
  58                                                 String value = params.getFirst(name);
  59
  60                                                 for (Method method : item.getMethods()) {
  61                                                         if (method.isAnnotationPresent(Setter.class)) {
  62                                                                 Class<?>[] args = method.getParameterTypes();
  63                                                                 if (args.length == 1) {
  64                                                                         Object o = args[0].getConstructor(String.class).newInstance(value);
  65                                                                         method.invoke(obj, o);
  66                                                                 } else {
  67                                                                         method.invoke(obj);
  68                                                                 }
  69                                                         }
  70                                                 }
  71                                         }
  72                                 }
  73                         }
  74         } catch (InstantiationException | IllegalAccessException | IllegalArgumentException
  75                                                                                         | InvocationTargetException | NoSuchMethodException
  76                                                                                         | SecurityException e) {
  77                 throw new QueryParamInjectionException("issue with query params", e);
  78         }
  79
  80
  81                 return obj;
  82         }
  83 }