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;
  
  /**
   * The {@code Quantifier} class is intended for storing the information of the quantifier for a
   * pattern variable.
   */
  public class Quantifier implements Serializable {
  
    public static final Quantifier NONE = new Quantifier("");
    public static final Quantifier PLUS = new Quantifier("+");
    public static final Quantifier QMARK = new Quantifier("?");
    public static final Quantifier ASTERISK = new Quantifier("*");
    public static final Quantifier PLUS_RELUCTANT = new Quantifier("+?");
    public static final Quantifier ASTERISK_RELUCTANT = new Quantifier("*?");
    public static final Quantifier QMARK_RELUCTANT = new Quantifier("??");
  
    private final String repr;
  
    Quantifier(String repr) {
      this.repr = repr;
    }
  
    @Override
    public String toString() {
      return repr;
    }
  }
  