1 /*
2 * Copyright 2008 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.openehealth.ipf.platform.camel.core.util;
17
18 import org.apache.camel.CamelContext;
19
20 import java.util.Set;
21
22 /**
23 * @author Martin Krasser
24 */
25 public class Contexts {
26
27 public static <T> T bean(Class<T> type, CamelContext camelContext) {
28 T bean = beanOrNull(type, camelContext);
29 if (bean == null) {
30 throw new IllegalArgumentException(
31 "No bean available in the application context of type: "
32 + type);
33 }
34 return bean;
35 }
36
37 public static <T> T beanOrNull(Class<T> type, CamelContext camelContext) {
38 Set<T> beans = camelContext.getRegistry().findByType(type);
39 int count = beans.size();
40 if (count == 1) {
41 return beans.iterator().next();
42 } else if (count == 0) {
43 return null;
44 } else {
45 throw new IllegalArgumentException(
46 "Too many beans in the application context of type: "
47 + type + ". Found: " + count);
48 }
49 }
50
51 }