| /* |
| * 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.knox.gateway.filter.rewrite.api; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.ServiceLoader; |
| import java.util.Set; |
| |
| public abstract class UrlRewriteFunctionDescriptorFactory { |
| |
| private static Map<String,Class<? extends UrlRewriteFunctionDescriptor>> MAP |
| = loadDescriptors(); |
| |
| private UrlRewriteFunctionDescriptorFactory() { |
| } |
| |
| @SuppressWarnings("unchecked") |
| public static <T extends UrlRewriteFunctionDescriptor<?>> T create( String name ) { |
| try { |
| Class<? extends UrlRewriteFunctionDescriptor> descriptorClass = MAP.get( name ); |
| return (T)descriptorClass.newInstance(); |
| } catch( InstantiationException | IllegalAccessException e ) { |
| throw new IllegalArgumentException( name ); |
| } |
| } |
| |
| private static Map<String,Class<? extends UrlRewriteFunctionDescriptor>> loadDescriptors() { |
| Map<String,Class<? extends UrlRewriteFunctionDescriptor>> map |
| = new HashMap<>(); |
| ServiceLoader<? extends UrlRewriteFunctionDescriptor> descriptors |
| = ServiceLoader.load( UrlRewriteFunctionDescriptor.class ); |
| for( UrlRewriteFunctionDescriptor descriptor : descriptors ) { |
| String functionName = descriptor.name(); |
| Class<? extends UrlRewriteFunctionDescriptor> descriptorClass = descriptor.getClass() ; |
| map.put( functionName, descriptorClass ); |
| } |
| return map; |
| } |
| |
| public static Set<String> getNames() { |
| return MAP.keySet(); |
| } |
| } |