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.opcua.sdk.server.events.conversions;
  
  import org.eclipse.milo.opcua.stack.core.BuiltinDataType;
  import org.eclipse.milo.opcua.stack.core.NamespaceTable;
  import org.eclipse.milo.opcua.stack.core.types.builtin.ExpandedNodeId;
  import org.eclipse.milo.opcua.stack.core.types.builtin.NodeId;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  final class ExpandedNodeIdConversions {
  
      private ExpandedNodeIdConversions() {}
  
      @Nullable
      static NodeId expandedNodeIdToNodeId(@NotNull ExpandedNodeId e) {
          // TODO need a real NamespaceTable here
          return e.toNodeId(new NamespaceTable()).orElse(null);
      }
  
      @NotNull
      static String expandedNodeIdToString(@NotNull ExpandedNodeId e) {
          return e.toParseableString();
      }
  
      @Nullable
      static Object convert(@NotNull Object o, BuiltinDataType targetType, boolean implicit) {
          if (o instanceof ExpandedNodeId) {
              ExpandedNodeId eni = (ExpandedNodeId) o;
  
              return implicit ?
                  implicitConversion(eni, targetType) :
                  explicitConversion(eni, targetType);
          } else {
              return null;
          }
      }
  
      @Nullable
      static Object explicitConversion(@NotNull ExpandedNodeId eni, BuiltinDataType targetType) {
          //@formatter:off
          switch (targetType) {
              case NodeId:    return expandedNodeIdToNodeId(eni);
              default:        return implicitConversion(eni, targetType);
          }
          //@formatter:on
      }
  
      @Nullable
      static Object implicitConversion(@NotNull ExpandedNodeId eni, BuiltinDataType targetType) {
          //@formatter:off
          switch (targetType) {
              case String:    return expandedNodeIdToString(eni);
              default:        return null;
          }
          //@formatter:on
      }
  
  }
  