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.bpmn.builder.converter;
  
  import com.alibaba.compileflow.engine.bpmn.builder.converter.parser.BpmnStreamParser;
  import com.alibaba.compileflow.engine.bpmn.definition.BpmnModel;
  import com.alibaba.compileflow.engine.common.FlowModelType;
  import com.alibaba.compileflow.engine.core.builder.converter.AbstractFlowModelConverter;
  import com.alibaba.compileflow.engine.core.builder.converter.parser.model.FlowStreamSource;
  
  import java.io.OutputStream;
  
  /**
   * The main entry point for converting a BPMN 2.0 XML stream into a
   * {@link BpmnModel} object graph.
   * <p>
   * This class orchestrates the parsing process by delegating to a
   * {@link BpmnStreamParser}.
   *
   * @author yusu
   */
  public class BpmnModelConverter extends AbstractFlowModelConverter<BpmnModel> {
  
      public static BpmnModelConverter getInstance() {
          return Holder.INSTANCE;
      }
  
      @Override
      protected FlowModelType getFlowModelType() {
          return FlowModelType.BPMN;
      }
  
      @Override
      public BpmnModel convertToModel(FlowStreamSource flowStreamSource) {
          return BpmnStreamParser.getInstance().parse(flowStreamSource);
      }
  
      /**
       * Converts a {@link BpmnModel} object graph back into a BPMN 2.0 XML stream.
       *
       * @param model The {@link BpmnModel} to convert.
       * @return An {@link OutputStream} containing the BPMN 2.0 XML.
       * @throws UnsupportedOperationException This operation is not yet implemented.
       */
      @Override
      public OutputStream convertToStream(BpmnModel model) {
          throw new UnsupportedOperationException(
                  "BPMN model to XML stream conversion is not yet implemented. " +
                          "This feature requires implementing XML serialization for BpmnModel objects. " +
                          "Consider using the model's toString() method or implementing a custom XML writer."
          );
      }
  
      private static class Holder {
          private static final BpmnModelConverter INSTANCE = new BpmnModelConverter();
      }
  
  }
  