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.nodes;
  
  import org.eclipse.milo.opcua.sdk.server.nodes.filters.AttributeFilter;
  import org.eclipse.milo.opcua.sdk.server.nodes.filters.AttributeFilterContext.GetAttributeContext;
  import org.eclipse.milo.opcua.sdk.server.nodes.filters.AttributeFilterContext.SetAttributeContext;
  import org.eclipse.milo.opcua.stack.core.AttributeId;
  import org.jetbrains.annotations.Nullable;
  
  /**
   * An {@link AttributeFilter} that gets or sets the actual attribute value from the backing field of a {@link UaNode}.
   * <p>
   * {@link DefaultAttributeFilter} does not invoke further attribute filters in the chain.
   */
  public final class DefaultAttributeFilter implements AttributeFilter {
  
      @Nullable
      @Override
      public Object getAttribute(GetAttributeContext ctx, AttributeId attributeId) {
          return ctx.getNode().getAttribute(attributeId);
      }
  
      @Override
      public void setAttribute(SetAttributeContext ctx, AttributeId attributeId, @Nullable Object value) {
          ctx.getNode().setAttribute(attributeId, value);
      }
  
  }
  