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.model;
  
  import com.alibaba.compileflow.engine.common.CompileFlowException;
  import com.alibaba.compileflow.engine.common.ErrorCode;
  import com.alibaba.compileflow.engine.core.infrastructure.utils.ClassLoaderUtils;
  
  import java.io.InputStream;
  
  /**
   * @author yusu
   */
  public class ResourceFlowStreamSource extends FlowStreamSource {
  
      private String resource;
      private ClassLoader classLoader;
  
      public static ResourceFlowStreamSource of(String code, String resource) {
          ResourceFlowStreamSource resourceFlowStreamSource = new ResourceFlowStreamSource();
          resourceFlowStreamSource.setCode(code);
          resourceFlowStreamSource.setResource(resource);
          return resourceFlowStreamSource;
      }
  
      public static ResourceFlowStreamSource of(String code, String resource, ClassLoader classLoader) {
          ResourceFlowStreamSource resourceFlowStreamSource = of(code, resource);
          resourceFlowStreamSource.setClassLoader(classLoader);
          return resourceFlowStreamSource;
      }
  
      private void setResource(String resource) {
          this.resource = resource;
      }
  
      private void setClassLoader(ClassLoader classLoader) {
          this.classLoader = classLoader;
      }
  
      @Override
      public InputStream getFlow() {
          InputStream inputStream = classLoader == null ? ClassLoaderUtils.getResourceAsStream(resource)
                  : classLoader.getResourceAsStream(resource);
  
          if (inputStream == null) {
              throw new CompileFlowException.ResourceException(
                      ErrorCode.CF_RESOURCE_002,
                      "Failed to load flow, code is " + getCode() + ", resource is " + resource,
                      null
              );
          }
          return inputStream;
      }
  
  }
  