content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.beam.sdk.extensions.sql.impl.cep;
  
  import java.io.Serializable;
  import javax.annotation.Nullable;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rex.RexCall;
  
  /** Core pattern class that stores the definition of a single pattern. */
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  public class CEPPattern implements Serializable {
  
    private final String patternVar;
    private final CEPCall patternCondition;
    private final Quantifier quant;
  
    private CEPPattern(String patternVar, @Nullable RexCall patternDef, Quantifier quant) {
  
      this.patternVar = patternVar;
      this.quant = quant;
  
      if (patternDef == null) {
        this.patternCondition = null;
        return;
      }
  
      this.patternCondition = CEPCall.of(patternDef);
    }
  
    @Override
    public String toString() {
      return patternVar + quant.toString();
    }
  
    public CEPCall getPatternCondition() {
      return patternCondition;
    }
  
    public String getPatternVar() {
      return patternVar;
    }
  
    public Quantifier getQuantifier() {
      return quant;
    }
  
    public static CEPPattern of(
        Schema theSchema, String patternVar, RexCall patternDef, Quantifier quant) {
      return new CEPPattern(patternVar, patternDef, quant);
    }
  }
  