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.rel.type;
  
  import org.apache.calcite.util.Glossary;
  
  /**
   * RelDataTypePrecedenceList defines a type precedence list for a particular
   * type.
   *
   * @see Glossary#SQL99 SQL:1999 Part 2 Section 9.5
   */
  public interface RelDataTypePrecedenceList {
    //~ Methods ----------------------------------------------------------------
  
    /**
     * Determines whether a type appears in this precedence list.
     *
     * @param type type to check
     * @return true iff this list contains type
     */
    boolean containsType(RelDataType type);
  
    /**
     * Compares the precedence of two types.
     *
     * <p>The list must contain both types.
     *
     * @param type1 first type to compare
     * @param type2 second type to compare
     * @return positive if type1 has higher precedence; negative if type2 has
     * higher precedence; 0 if types have equal precedence
     */
    int compareTypePrecedence(RelDataType type1, RelDataType type2);
  }
  