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.calcite.sql.type;
  
  import org.apache.calcite.sql.SqlOperandCountRange;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  /**
   * Helpers for {@link SqlOperandCountRange}.
   */
  public abstract class SqlOperandCountRanges {
    public static SqlOperandCountRange of(int length) {
      return new RangeImpl(length, length);
    }
  
    public static SqlOperandCountRange between(int min, int max) {
      return new RangeImpl(min, max);
    }
  
    public static SqlOperandCountRange from(int min) {
      return new RangeImpl(min, -1);
    }
  
    public static SqlOperandCountRange any() {
      return new RangeImpl(0, -1);
    }
  
    /** Implementation of {@link SqlOperandCountRange}. */
    private static class RangeImpl implements SqlOperandCountRange {
      private final int min;
      private final int max;
  
      RangeImpl(int min, int max) {
        this.min = min;
        this.max = max;
        checkArgument(min <= max || max == -1);
        checkArgument(min >= 0);
      }
  
      @Override public boolean isValidCount(int count) {
        return count >= min && (max == -1 || count <= max);
      }
  
      @Override public int getMin() {
        return min;
      }
  
      @Override public int getMax() {
        return max;
      }
    }
  }
  