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   *   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
   *
   *    https://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
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   ****************************************************************/
  package org.apache.cayenne.project;
  
  import java.io.PrintWriter;
  
  import org.apache.cayenne.configuration.BaseConfigurationNodeVisitor;
  import org.apache.cayenne.configuration.DataChannelDescriptor;
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.project.extension.SaverDelegate;
  import org.apache.cayenne.util.XMLEncoder;
  import org.apache.cayenne.util.XMLSerializable;
  
  /**
   * @since 3.1
   */
  class ConfigurationSaver extends BaseConfigurationNodeVisitor<Void> {
  
      private PrintWriter printWriter;
      private String version;
      private SaverDelegate delegate;
  
      ConfigurationSaver(PrintWriter printWriter, String version, SaverDelegate delegate) {
          this.printWriter = printWriter;
          this.version = version;
          this.delegate = delegate;
      }
  
      @Override
      public Void visitDataChannelDescriptor(DataChannelDescriptor node) {
          encodeNode(node);
          return null;
      }
  
      @Override
      public Void visitDataMap(DataMap node) {
          encodeNode(node);
          return null;
      }
  
      private void encodeNode(XMLSerializable node) {
          XMLEncoder encoder = new XMLEncoder(printWriter, "\t", version);
          encoder.println("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
          delegate.setXMLEncoder(encoder);
          node.encodeAsXML(encoder, delegate);
      }
  }
  