content: /*
   * 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 com.alibaba.compileflow.engine.core.builder.converter.parser.provider;
  
  import com.alibaba.compileflow.engine.common.CompileFlowException;
  import com.alibaba.compileflow.engine.common.ErrorCode;
  import com.alibaba.compileflow.engine.core.builder.converter.parser.Parser;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.concurrent.ConcurrentHashMap;
  
  /**
   * @author wuxiang
   * @author yusu
   */
  public abstract class AbstractParserProvider<T extends Parser> implements ParserProvider<T> {
  
      private final Map<String, Parser> parserMap = new ConcurrentHashMap<>();
      private List<Parser> parsers = new ArrayList<>();
  
      @Override
      @SuppressWarnings("unchecked")
      public T getParser(String name) {
          return Optional.ofNullable((T) parserMap.get(name)).orElseThrow(
                  () -> new CompileFlowException.ConfigurationException(
                          ErrorCode.CF_CONFIG_003,
                          "No parser found, name is " + name
                  ));
      }
  
      @Override
      public void registerParser(Parser parser) {
          Parser oldParser = parserMap.putIfAbsent(parser.getName(), parser);
          if (oldParser != null) {
              if (!oldParser.getClass().equals(parser.getClass())) {
                  throw new CompileFlowException.ConfigurationException(
                          ErrorCode.CF_CONFIG_001,
                          "Duplicated parser name[" + parser.getName() + "] found, "
                                  + "[" + parser.getClass().getName() + ", " + oldParser.getClass().getName() + "]",
                          null
                  );
              }
              return;
          }
          parsers.add(parser);
      }
  
  }
  