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.types.builtin.StatusCode;
  import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.UByte;
  import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.UInteger;
  import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.ULong;
  import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.UShort;
  import org.jetbrains.annotations.NotNull;
  import org.jetbrains.annotations.Nullable;
  
  import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.ubyte;
  import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.uint;
  import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.ushort;
  
  final class UInt64Conversions {
  
      private UInt64Conversions() {}
  
      @NotNull
      static Boolean uInt64ToBoolean(@NotNull ULong ul) {
          return ul.intValue() != 0;
      }
  
      @Nullable
      static UByte uInt64ToByte(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, UByte.MAX_VALUE) <= 0) {
              return ubyte(l);
          } else {
              return null;
          }
      }
  
      @Nullable
      static Double uInt64ToDouble(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, (long) Double.MAX_VALUE) <= 0) {
              return ul.doubleValue();
          } else {
              return null;
          }
      }
  
      @Nullable
      static Float uInt64ToFloat(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, (long) Float.MAX_VALUE) <= 0) {
              return ul.floatValue();
          } else {
              return null;
          }
      }
  
      @Nullable
      static Short uInt64ToInt16(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, Short.MAX_VALUE) <= 0) {
              return (short) l;
          } else {
              return null;
          }
      }
  
      @Nullable
      static Integer uInt64ToInt32(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, Integer.MAX_VALUE) <= 0) {
              return (int) l;
          } else {
              return null;
          }
      }
  
      @Nullable
      static Long uInt64ToInt64(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, Long.MAX_VALUE) <= 0) {
              return l;
          } else {
              return null;
          }
      }
  
      @Nullable
      static Byte uInt64ToSByte(@NotNull ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, Byte.MAX_VALUE) <= 0) {
              return (byte) l;
          } else {
              return null;
          }
      }
  
      @Nullable
      static StatusCode uInt64ToStatusCode(@NotNull ULong ul) {
          UInteger ui = uInt64ToUInt32(ul);
  
          return ui != null ? UInt32Conversions.uInt32ToStatusCode(ui) : null;
      }
  
      @NotNull
      static String uInt64ToString(ULong ul) {
          return ul.toString();
      }
  
      @Nullable
      static UShort uInt64ToUInt16(ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, UShort.MAX_VALUE) <= 0) {
              return ushort((int) l);
          } else {
              return null;
          }
      }
  
      @Nullable
      static UInteger uInt64ToUInt32(ULong ul) {
          long l = ul.longValue();
  
          if (Long.compareUnsigned(l, UInteger.MAX_VALUE) <= 0) {
              return uint(l);
          } else {
              return null;
          }
      }
  
      @Nullable
      static Object convert(@Nullable Object o, BuiltinDataType targetType, boolean implicit) {
          if (o instanceof ULong) {
              ULong ul = (ULong) o;
  
              return implicit ?
                  implicitConversion(ul, targetType) :
                  explicitConversion(ul, targetType);
          } else {
              return null;
          }
      }
  
      @Nullable
      static Object explicitConversion(@NotNull ULong ul, BuiltinDataType targetType) {
          //@formatter:off
          switch (targetType) {
              case Boolean:       return uInt64ToBoolean(ul);
              case Byte:          return uInt64ToByte(ul);
              case Int16:         return uInt64ToInt16(ul);
              case Int32:         return uInt64ToInt32(ul);
              case SByte:         return uInt64ToSByte(ul);
              case StatusCode:    return uInt64ToStatusCode(ul);
              case String:        return uInt64ToString(ul);
              case UInt16:        return uInt64ToUInt16(ul);
              case UInt32:        return uInt64ToUInt32(ul);
              default:            return implicitConversion(ul, targetType);
          }
          //@formatter:on
      }
  
      @Nullable
      static Object implicitConversion(@NotNull ULong ul, BuiltinDataType targetType) {
          //@formatter:off
          switch (targetType) {
              case Double:        return uInt64ToDouble(ul);
              case Float:         return uInt64ToFloat(ul);
              case Int64:         return uInt64ToInt64(ul);
              default:            return null;
          }
          //@formatter:on
      }
  
  }
  