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