| /* |
| * 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.hugegraph.backend.store; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.hugegraph.exception.NotSupportException; |
| |
| public class MetaDispatcher<Session extends BackendSession> { |
| |
| protected final Map<String, MetaHandler<Session>> metaHandlers; |
| |
| public MetaDispatcher() { |
| this.metaHandlers = new ConcurrentHashMap<>(); |
| } |
| |
| public void registerMetaHandler(String meta, MetaHandler<Session> handler) { |
| this.metaHandlers.put(meta, handler); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public <R> R dispatchMetaHandler(Session session, |
| String meta, Object[] args) { |
| if (!this.metaHandlers.containsKey(meta)) { |
| throw new NotSupportException("metadata '%s'", meta); |
| } |
| return (R) this.metaHandlers.get(meta).handle(session, meta, args); |
| } |
| } |