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 java.util.Map;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlKind;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.sql.SqlOperator;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  
  /**
   * The {@code CEPOperator} records the operators (i.e. functions) in the {@code DEFINE} clause of
   * {@code MATCH_RECOGNIZE}.
   */
  public class CEPOperator implements Serializable {
    private final CEPKind cepKind;
    private static final Map<SqlKind, CEPKind> CEPKindTable =
        ImmutableMap.<SqlKind, CEPKind>builder()
            .put(SqlKind.SUM, CEPKind.SUM)
            .put(SqlKind.COUNT, CEPKind.COUNT)
            .put(SqlKind.AVG, CEPKind.AVG)
            .put(SqlKind.FIRST, CEPKind.FIRST)
            .put(SqlKind.LAST, CEPKind.LAST)
            .put(SqlKind.PREV, CEPKind.PREV)
            .put(SqlKind.NEXT, CEPKind.NEXT)
            .put(SqlKind.EQUALS, CEPKind.EQUALS)
            .put(SqlKind.NOT_EQUALS, CEPKind.NOT_EQUALS)
            .put(SqlKind.GREATER_THAN, CEPKind.GREATER_THAN)
            .put(SqlKind.GREATER_THAN_OR_EQUAL, CEPKind.GREATER_THAN_OR_EQUAL)
            .put(SqlKind.LESS_THAN, CEPKind.LESS_THAN)
            .put(SqlKind.LESS_THAN_OR_EQUAL, CEPKind.LESS_THAN_OR_EQUAL)
            .put(SqlKind.TIMES, CEPKind.TIMES)
            .put(SqlKind.DIVIDE, CEPKind.DIVIDE)
            .put(SqlKind.PLUS, CEPKind.PLUS)
            .put(SqlKind.MINUS, CEPKind.MINUS)
            .build();
  
    private CEPOperator(CEPKind cepKind) {
      this.cepKind = cepKind;
    }
  
    public CEPKind getCepKind() {
      return cepKind;
    }
  
    public static CEPOperator of(SqlOperator op) {
      SqlKind opKind = op.getKind();
      return new CEPOperator(CEPKindTable.getOrDefault(opKind, CEPKind.NONE));
    }
  
    @Override
    public String toString() {
      return cepKind.name();
    }
  }
  