code: /*
   * Copyright (c) 2019 the Eclipse Milo Authors
   *
   * This program and the accompanying materials are made
   * available under the terms of the Eclipse Public License 2.0
   * which is available at https://www.eclipse.org/legal/epl-2.0/
   *
   * SPDX-License-Identifier: EPL-2.0
   */
  
  package org.eclipse.milo.examples.server.types;
  
  import org.eclipse.milo.examples.server.ExampleNamespace;
  import org.eclipse.milo.opcua.stack.core.serialization.SerializationContext;
  import org.eclipse.milo.opcua.stack.core.serialization.UaDecoder;
  import org.eclipse.milo.opcua.stack.core.serialization.UaEncoder;
  import org.eclipse.milo.opcua.stack.core.serialization.UaEnumeration;
  import org.eclipse.milo.opcua.stack.core.serialization.codecs.GenericDataTypeCodec;
  import org.eclipse.milo.opcua.stack.core.types.builtin.ExpandedNodeId;
  import org.jetbrains.annotations.Nullable;
  
  public enum CustomEnumType implements UaEnumeration {
  
      Field0(0),
      Field1(1),
      Field2(2);
  
      public static final ExpandedNodeId TYPE_ID = ExpandedNodeId.parse(String.format(
          "nsu=%s;s=%s",
          ExampleNamespace.NAMESPACE_URI,
          "DataType.CustomEnumType"
      ));
  
      private final int value;
  
      CustomEnumType(int value) {
          this.value = value;
      }
  
      @Override
      public int getValue() {
          return value;
      }
  
      @Nullable
      public static CustomEnumType from(int value) {
          switch (value) {
              case 0:
                  return Field0;
              case 1:
                  return Field1;
              case 2:
                  return Field2;
              default:
                  return null;
          }
      }
  
      public static class Codec extends GenericDataTypeCodec<CustomEnumType> {
          @Override
          public Class<CustomEnumType> getType() {
              return CustomEnumType.class;
          }
  
          @Override
          public CustomEnumType decode(SerializationContext context, UaDecoder decoder) {
              return CustomEnumType.from(decoder.readInt32(null));
          }
  
          @Override
          public void encode(SerializationContext context, UaEncoder encoder, CustomEnumType value) {
              encoder.writeInt32(null, value.getValue());
          }
      }
  
  }
  