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java/org/apache/tomcat/websocket/TransformationFactory.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tomcat.websocket;
+
+import java.util.List;
+
+import javax.websocket.Extension;
+
+import org.apache.tomcat.util.res.StringManager;
+
+public class TransformationFactory {
+
+    private static final StringManager sm = StringManager.getManager(TransformationFactory.class);
+
+    private static final TransformationFactory factory = new TransformationFactory();
+
+    private TransformationFactory() {
+        // Hide default constructor
+    }
+
+    public static TransformationFactory getInstance() {
+        return factory;
+    }
+
+    public Transformation create(String name, List<List<Extension.Parameter>> preferences,
+            boolean isServer) {
+        if (PerMessageDeflate.NAME.equals(name)) {
+            return PerMessageDeflate.negotiate(preferences, isServer);
+        }
+        if (Constants.ALLOW_UNSUPPORTED_EXTENSIONS) {
+            return null;
+        } else {
+            throw new IllegalArgumentException(
+                    sm.getString("transformerFactory.unsupportedExtension", name));
+        }
+    }
+}