code: package org.eclipse.milo.opcua.sdk.client.model.types.variables;
  
  import java.util.concurrent.CompletableFuture;
  
  import org.eclipse.milo.opcua.sdk.core.QualifiedProperty;
  import org.eclipse.milo.opcua.sdk.core.ValueRanks;
  import org.eclipse.milo.opcua.stack.core.UaException;
  import org.eclipse.milo.opcua.stack.core.types.builtin.ExpandedNodeId;
  import org.eclipse.milo.opcua.stack.core.types.builtin.LocalizedText;
  import org.eclipse.milo.opcua.stack.core.types.builtin.StatusCode;
  import org.eclipse.milo.opcua.stack.core.types.structured.EnumValueType;
  
  public interface MultiStateValueDiscreteType extends DiscreteItemType {
      QualifiedProperty<EnumValueType[]> ENUM_VALUES = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "EnumValues",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=7594"),
          ValueRanks.OneDimension,
          EnumValueType[].class
      );
  
      QualifiedProperty<LocalizedText> VALUE_AS_TEXT = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "ValueAsText",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=21"),
          ValueRanks.Scalar,
          LocalizedText.class
      );
  
      /**
       * Get the local value of the EnumValues Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the EnumValues Node.
       * @throws UaException if an error occurs creating or getting the EnumValues Node.
       */
      EnumValueType[] getEnumValues() throws UaException;
  
      /**
       * Set the local value of the EnumValues Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param enumValues the local value to set for the EnumValues Node.
       * @throws UaException if an error occurs creating or getting the EnumValues Node.
       */
      void setEnumValues(EnumValueType[] enumValues) throws UaException;
  
      /**
       * Read the value of the EnumValues Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link EnumValueType[]} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      EnumValueType[] readEnumValues() throws UaException;
  
      /**
       * Write a new value for the EnumValues Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param enumValues the {@link EnumValueType[]} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeEnumValues(EnumValueType[] enumValues) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readEnumValues()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends EnumValueType[]> readEnumValuesAsync();
  
      /**
       * An asynchronous implementation of {@link #writeEnumValues(EnumValueType[])}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeEnumValuesAsync(EnumValueType[] enumValues);
  
      /**
       * Get the EnumValues {@link PropertyType} Node, or {@code null} if it does not exist.
       * <p>
       * The Node is created when first accessed and cached for subsequent calls.
       *
       * @return the EnumValues {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getEnumValuesNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getEnumValuesNode()}.
       *
       * @return a CompletableFuture that completes successfully with the
       * ? extends PropertyType Node or completes exceptionally if an error occurs
       * creating or getting the Node.
       */
      CompletableFuture<? extends PropertyType> getEnumValuesNodeAsync();
  
      /**
       * Get the local value of the ValueAsText Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the ValueAsText Node.
       * @throws UaException if an error occurs creating or getting the ValueAsText Node.
       */
      LocalizedText getValueAsText() throws UaException;
  
      /**
       * Set the local value of the ValueAsText Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param valueAsText the local value to set for the ValueAsText Node.
       * @throws UaException if an error occurs creating or getting the ValueAsText Node.
       */
      void setValueAsText(LocalizedText valueAsText) throws UaException;
  
      /**
       * Read the value of the ValueAsText Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link LocalizedText} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      LocalizedText readValueAsText() throws UaException;
  
      /**
       * Write a new value for the ValueAsText Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param valueAsText the {@link LocalizedText} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeValueAsText(LocalizedText valueAsText) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readValueAsText()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends LocalizedText> readValueAsTextAsync();
  
      /**
       * An asynchronous implementation of {@link #writeValueAsText(LocalizedText)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeValueAsTextAsync(LocalizedText valueAsText);
  
      /**
       * Get the ValueAsText {@link PropertyType} Node, or {@code null} if it does not exist.
       * <p>
       * The Node is created when first accessed and cached for subsequent calls.
       *
       * @return the ValueAsText {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getValueAsTextNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getValueAsTextNode()}.
       *
       * @return a CompletableFuture that completes successfully with the
       * ? extends PropertyType Node or completes exceptionally if an error occurs
       * creating or getting the Node.
       */
      CompletableFuture<? extends PropertyType> getValueAsTextNodeAsync();
  }
  