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.client.subscriptions;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.milo.opcua.stack.core.AttributeId;
  import org.eclipse.milo.opcua.stack.core.types.builtin.NodeId;
  import org.eclipse.milo.opcua.stack.core.types.builtin.QualifiedName;
  import org.eclipse.milo.opcua.stack.core.types.structured.ContentFilter;
  import org.eclipse.milo.opcua.stack.core.types.structured.EventFilter;
  import org.eclipse.milo.opcua.stack.core.types.structured.SimpleAttributeOperand;
  
  
  public class EventFilterBuilder {
  
      private List<SimpleAttributeOperand> selectClauses = new ArrayList<>();
      private ContentFilter whereClause = new ContentFilter(null);
  
      public EventFilterBuilder select(NodeId typeDefinitionId, QualifiedName browseName) {
          SimpleAttributeOperand operand = new SimpleAttributeOperand(
              typeDefinitionId,
              new QualifiedName[]{browseName},
              AttributeId.Value.uid(),
              null
          );
  
          return select(operand);
      }
  
      public EventFilterBuilder select(NodeId typeDefinitionId, QualifiedName... browseNames) {
          SimpleAttributeOperand operand = new SimpleAttributeOperand(
              typeDefinitionId,
              browseNames,
              AttributeId.Value.uid(),
              null
          );
  
          return select(operand);
      }
  
      public EventFilterBuilder select(NodeId typeDefinitionId, List<QualifiedName> browseNames) {
          SimpleAttributeOperand operand = new SimpleAttributeOperand(
              typeDefinitionId,
              browseNames.toArray(new QualifiedName[0]),
              AttributeId.Value.uid(),
              null
          );
  
          return select(operand);
      }
  
      public EventFilterBuilder select(SimpleAttributeOperand selectClause) {
          selectClauses.add(selectClause);
  
          return this;
      }
  
      public EventFilterBuilder where(ContentFilter whereClause) {
          this.whereClause = whereClause;
          return this;
      }
  
      public EventFilter build() {
          return new EventFilter(selectClauses.toArray(new SimpleAttributeOperand[0]), whereClause);
      }
  
  }
  