2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2019 Nordix Foundation.
4 * ================================================================================
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
17 * SPDX-License-Identifier: Apache-2.0
18 * ============LICENSE_END=========================================================
21 package org.onap.sdnc.northbound.restadpter;
23 import org.slf4j.Logger;
24 import org.slf4j.LoggerFactory;
25 import org.springframework.http.HttpEntity;
26 import org.springframework.http.HttpMethod;
27 import org.springframework.http.HttpStatus;
28 import org.springframework.http.ResponseEntity;
29 import org.springframework.web.client.RestTemplate;
30 import com.google.common.base.Optional;
33 * This class provides the Generic Rest Adapter interface to the RestTemplate
35 * @author lathishbabu.ganesan@est.tech
39 public class RestAdapterImpl implements RestAdapter {
41 private final Logger log = LoggerFactory.getLogger(RestAdapterImpl.class);
43 private RestTemplate restTemplate;
45 public RestAdapterImpl() {
46 restTemplate = new RestTemplate();
49 private HttpEntity<?> getHttpEntity(final Object object) {
50 return new HttpEntity<>(object);
54 public <T> Optional<T> get(String uri, Class<?> clazz) {
55 HttpEntity<?> entity = getHttpEntity(null);
56 final ResponseEntity<T> response = invokeHttpRequest(uri, HttpMethod.GET, clazz, entity);
57 return buildOptional(response);
61 public <T> Optional<T> put(String uri, Object object) {
62 HttpEntity<?> entity = getHttpEntity(object);
63 final ResponseEntity<T> response = invokeHttpRequest(uri, HttpMethod.PUT, null, entity);
64 return buildOptional(response);
68 public <T> Optional<T> delete(String uri) {
69 HttpEntity<?> entity = getHttpEntity(null);
70 final ResponseEntity<T> response = invokeHttpRequest(uri, HttpMethod.DELETE, null, entity);
71 return buildOptional(response);
74 @SuppressWarnings("unchecked")
75 private <T> ResponseEntity<T> invokeHttpRequest(String uri, HttpMethod httpMethod, Class<?> clazz,
76 HttpEntity<?> entity) {
77 return (ResponseEntity<T>) restTemplate.exchange(uri, httpMethod, entity, clazz);
80 private <T> Optional<T> buildOptional(ResponseEntity<T> response) {
81 if (!response.getStatusCode().equals(HttpStatus.OK)
82 | !response.getStatusCode().equals(HttpStatus.CREATED)
83 | !response.getStatusCode().equals(HttpStatus.NO_CONTENT)) {
84 log.error("Failed to get the Response");
85 return Optional.absent();
87 if (response.hasBody()) {
88 return Optional.of(response.getBody());
90 return Optional.absent();