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.writer.provider;
  
  import com.alibaba.compileflow.engine.common.CompileFlowException;
  import com.alibaba.compileflow.engine.common.ErrorCode;
  import com.alibaba.compileflow.engine.core.builder.converter.writer.FlowElementWriter;
  import com.alibaba.compileflow.engine.core.definition.Element;
  
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * @author wuxiang
   * @author yusu
   */
  public abstract class AbstractFlowElementWriterProvider implements FlowElementWriterProvider {
  
      protected List<FlowElementWriter> writers = new ArrayList<>();
  
      protected Map<Class<? extends Element>, FlowElementWriter> writerMap = new HashMap<>();
  
      @Override
      public FlowElementWriter getWriter(Class<? extends Element> clazz) {
          FlowElementWriter writer = writerMap.get(clazz);
          if (writer == null) {
              throw new CompileFlowException.ConfigurationException(
                      ErrorCode.CF_CONFIG_003,
                      "No writer found, name is " + clazz.getName(),
                      null
              );
          }
          return writer;
      }
  
      @Override
      public void registerWriter(FlowElementWriter writer) {
          writers.add(writer);
          writerMap.put(writer.getElementClass(), writer);
      }
  
  }
  