xref: /unit/src/java/nginx/unit/websocket/TransformationFactory.java (revision 1157:7ae152bda303)
1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements.  See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License.  You may obtain a copy of the License at
8  *
9  *      http://www.apache.org/licenses/LICENSE-2.0
10  *
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.
16  */
17 package nginx.unit.websocket;
18 
19 import java.util.List;
20 
21 import javax.websocket.Extension;
22 
23 import org.apache.tomcat.util.res.StringManager;
24 
25 public class TransformationFactory {
26 
27     private static final StringManager sm = StringManager.getManager(TransformationFactory.class);
28 
29     private static final TransformationFactory factory = new TransformationFactory();
30 
TransformationFactory()31     private TransformationFactory() {
32         // Hide default constructor
33     }
34 
getInstance()35     public static TransformationFactory getInstance() {
36         return factory;
37     }
38 
create(String name, List<List<Extension.Parameter>> preferences, boolean isServer)39     public Transformation create(String name, List<List<Extension.Parameter>> preferences,
40             boolean isServer) {
41         if (PerMessageDeflate.NAME.equals(name)) {
42             return PerMessageDeflate.negotiate(preferences, isServer);
43         }
44         if (Constants.ALLOW_UNSUPPORTED_EXTENSIONS) {
45             return null;
46         } else {
47             throw new IllegalArgumentException(
48                     sm.getString("transformerFactory.unsupportedExtension", name));
49         }
50     }
51 }
52