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.fun;
  
  import org.apache.calcite.sql.SqlKind;
  import org.apache.calcite.sql.SqlOperator;
  import org.apache.calcite.sql.SqlSyntax;
  import org.apache.calcite.sql.type.InferTypes;
  import org.apache.calcite.sql.type.OperandTypes;
  import org.apache.calcite.sql.type.ReturnTypes;
  
  /**
   * Concrete implementation of {@link SqlOperator}.
   *
   * <p>The class is final, and instances are immutable.
   *
   * <p>Instances are created only by {@link SqlBasicOperator#create} and are
   * "modified" by "wither" methods such as {@link #withPrecedence} to create a new
   * instance with one property changed. Since the class is final, you can modify
   * behavior only by providing strategy objects, not by overriding methods in a
   * subclass.
   */
  public final class SqlBasicOperator extends SqlOperator {
    @Override public SqlSyntax getSyntax() {
      return SqlSyntax.SPECIAL;
    }
  
    /** Private constructor. Use {@link #create}. */
    private SqlBasicOperator(String name, int leftPrecedence, int rightPrecedence,
        SqlCallFactory callFactory) {
      super(name, SqlKind.OTHER, leftPrecedence, rightPrecedence,
          ReturnTypes.BOOLEAN, InferTypes.RETURN_TYPE, OperandTypes.ANY, callFactory);
    }
  
    public static SqlBasicOperator create(String name) {
      return new SqlBasicOperator(name, 0, 0,
          SqlCallFactories.SQL_BASIC_CALL_FACTORY);
    }
  
    public SqlBasicOperator withPrecedence(int prec, boolean leftAssoc) {
      return new SqlBasicOperator(getName(), leftPrec(prec, leftAssoc),
          rightPrec(prec, leftAssoc), getSqlCallFactory());
    }
  
    public SqlBasicOperator withCallFactory(SqlCallFactory sqlCallFactory) {
      return new SqlBasicOperator(getName(), getLeftPrec(),
          getRightPrec(), sqlCallFactory);
    }
  }
  