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.DateTime;
  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;
  
  public interface TwoStateVariableType extends StateVariableType {
      QualifiedProperty<Boolean> ID = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "Id",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=1"),
          ValueRanks.Scalar,
          Boolean.class
      );
  
      QualifiedProperty<DateTime> TRANSITION_TIME = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "TransitionTime",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=294"),
          ValueRanks.Scalar,
          DateTime.class
      );
  
      QualifiedProperty<DateTime> EFFECTIVE_TRANSITION_TIME = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "EffectiveTransitionTime",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=294"),
          ValueRanks.Scalar,
          DateTime.class
      );
  
      QualifiedProperty<LocalizedText> TRUE_STATE = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "TrueState",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=21"),
          ValueRanks.Scalar,
          LocalizedText.class
      );
  
      QualifiedProperty<LocalizedText> FALSE_STATE = new QualifiedProperty<>(
          "http://opcfoundation.org/UA/",
          "FalseState",
          ExpandedNodeId.parse("nsu=http://opcfoundation.org/UA/;i=21"),
          ValueRanks.Scalar,
          LocalizedText.class
      );
  
      /**
       * Get the local value of the Id Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the Id Node.
       * @throws UaException if an error occurs creating or getting the Id Node.
       */
      Boolean getId() throws UaException;
  
      /**
       * Set the local value of the Id Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param id the local value to set for the Id Node.
       * @throws UaException if an error occurs creating or getting the Id Node.
       */
      void setId(Boolean id) throws UaException;
  
      /**
       * Read the value of the Id Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link Boolean} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      Boolean readId() throws UaException;
  
      /**
       * Write a new value for the Id Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param id the {@link Boolean} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeId(Boolean id) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readId()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends Boolean> readIdAsync();
  
      /**
       * An asynchronous implementation of {@link #writeId(Boolean)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeIdAsync(Boolean id);
  
      /**
       * Get the Id {@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 Id {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getIdNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getIdNode()}.
       *
       * @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> getIdNodeAsync();
  
      /**
       * Get the local value of the TransitionTime Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the TransitionTime Node.
       * @throws UaException if an error occurs creating or getting the TransitionTime Node.
       */
      DateTime getTransitionTime() throws UaException;
  
      /**
       * Set the local value of the TransitionTime Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param transitionTime the local value to set for the TransitionTime Node.
       * @throws UaException if an error occurs creating or getting the TransitionTime Node.
       */
      void setTransitionTime(DateTime transitionTime) throws UaException;
  
      /**
       * Read the value of the TransitionTime Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link DateTime} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      DateTime readTransitionTime() throws UaException;
  
      /**
       * Write a new value for the TransitionTime Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param transitionTime the {@link DateTime} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeTransitionTime(DateTime transitionTime) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readTransitionTime()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends DateTime> readTransitionTimeAsync();
  
      /**
       * An asynchronous implementation of {@link #writeTransitionTime(DateTime)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeTransitionTimeAsync(DateTime transitionTime);
  
      /**
       * Get the TransitionTime {@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 TransitionTime {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getTransitionTimeNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getTransitionTimeNode()}.
       *
       * @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> getTransitionTimeNodeAsync();
  
      /**
       * Get the local value of the EffectiveTransitionTime Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the EffectiveTransitionTime Node.
       * @throws UaException if an error occurs creating or getting the EffectiveTransitionTime Node.
       */
      DateTime getEffectiveTransitionTime() throws UaException;
  
      /**
       * Set the local value of the EffectiveTransitionTime Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param effectiveTransitionTime the local value to set for the EffectiveTransitionTime Node.
       * @throws UaException if an error occurs creating or getting the EffectiveTransitionTime Node.
       */
      void setEffectiveTransitionTime(DateTime effectiveTransitionTime) throws UaException;
  
      /**
       * Read the value of the EffectiveTransitionTime Node from the server and update the local value if the
       * operation succeeds.
       *
       * @return the {@link DateTime} value read from the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      DateTime readEffectiveTransitionTime() throws UaException;
  
      /**
       * Write a new value for the EffectiveTransitionTime Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param effectiveTransitionTime the {@link DateTime} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeEffectiveTransitionTime(DateTime effectiveTransitionTime) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readEffectiveTransitionTime()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends DateTime> readEffectiveTransitionTimeAsync();
  
      /**
       * An asynchronous implementation of {@link #writeEffectiveTransitionTime(DateTime)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeEffectiveTransitionTimeAsync(DateTime effectiveTransitionTime);
  
      /**
       * Get the EffectiveTransitionTime {@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 EffectiveTransitionTime {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getEffectiveTransitionTimeNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getEffectiveTransitionTimeNode()}.
       *
       * @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> getEffectiveTransitionTimeNodeAsync();
  
      /**
       * Get the local value of the TrueState Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the TrueState Node.
       * @throws UaException if an error occurs creating or getting the TrueState Node.
       */
      LocalizedText getTrueState() throws UaException;
  
      /**
       * Set the local value of the TrueState Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param trueState the local value to set for the TrueState Node.
       * @throws UaException if an error occurs creating or getting the TrueState Node.
       */
      void setTrueState(LocalizedText trueState) throws UaException;
  
      /**
       * Read the value of the TrueState 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 readTrueState() throws UaException;
  
      /**
       * Write a new value for the TrueState Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param trueState the {@link LocalizedText} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeTrueState(LocalizedText trueState) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readTrueState()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends LocalizedText> readTrueStateAsync();
  
      /**
       * An asynchronous implementation of {@link #writeTrueState(LocalizedText)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeTrueStateAsync(LocalizedText trueState);
  
      /**
       * Get the TrueState {@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 TrueState {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getTrueStateNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getTrueStateNode()}.
       *
       * @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> getTrueStateNodeAsync();
  
      /**
       * Get the local value of the FalseState Node.
       * <p>
       * The returned value is the last seen; it is not read live from the server.
       *
       * @return the local value of the FalseState Node.
       * @throws UaException if an error occurs creating or getting the FalseState Node.
       */
      LocalizedText getFalseState() throws UaException;
  
      /**
       * Set the local value of the FalseState Node.
       * <p>
       * The value is only updated locally; it is not written to the server.
       *
       * @param falseState the local value to set for the FalseState Node.
       * @throws UaException if an error occurs creating or getting the FalseState Node.
       */
      void setFalseState(LocalizedText falseState) throws UaException;
  
      /**
       * Read the value of the FalseState 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 readFalseState() throws UaException;
  
      /**
       * Write a new value for the FalseState Node to the server and update the local value if
       * the operation succeeds.
       *
       * @param falseState the {@link LocalizedText} value to write to the server.
       * @throws UaException if a service- or operation-level error occurs.
       */
      void writeFalseState(LocalizedText falseState) throws UaException;
  
      /**
       * An asynchronous implementation of {@link #readFalseState()}.
       *
       * @return a CompletableFuture that completes successfully with the property value or completes
       * exceptionally if an operation- or service-level error occurs.
       */
      CompletableFuture<? extends LocalizedText> readFalseStateAsync();
  
      /**
       * An asynchronous implementation of {@link #writeFalseState(LocalizedText)}.
       *
       * @return a CompletableFuture that completes successfully with the operation result or
       * completes exceptionally if a service-level error occurs.
       */
      CompletableFuture<StatusCode> writeFalseStateAsync(LocalizedText falseState);
  
      /**
       * Get the FalseState {@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 FalseState {@link PropertyType} Node, or {@code null} if it does not exist.
       * @throws UaException if an error occurs creating or getting the Node.
       */
      PropertyType getFalseStateNode() throws UaException;
  
      /**
       * Asynchronous implementation of {@link #getFalseStateNode()}.
       *
       * @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> getFalseStateNodeAsync();
  }
  