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.SqlCallBinding;
  import org.apache.calcite.sql.SqlIntervalQualifier;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlOperator;
  import org.apache.calcite.util.Static;
  import org.apache.calcite.util.Util;
  
  import java.util.function.Predicate;
  
  /**
   * Parameter type-checking strategy whether the operand must be an interval.
   */
  public class IntervalOperandTypeChecker implements SqlSingleOperandTypeChecker {
  
    private final Predicate<SqlIntervalQualifier> predicate;
  
    IntervalOperandTypeChecker(Predicate<SqlIntervalQualifier> predicate) {
      this.predicate = predicate;
    }
  
    @Override public boolean checkSingleOperandType(SqlCallBinding callBinding,
        SqlNode operand, int iFormalOperand, boolean throwOnFailure) {
      if (operand instanceof SqlIntervalQualifier) {
        final SqlIntervalQualifier interval = (SqlIntervalQualifier) operand;
        if (predicate.test(interval)) {
          return true;
        }
        if (throwOnFailure) {
          final String name =
              Util.first(interval.timeFrameName, interval.timeUnitRange.name());
          throw callBinding.getValidator().newValidationError(operand,
              Static.RESOURCE.invalidTimeFrame(name));
        }
      }
      return false;
    }
  
    @Override public String getAllowedSignatures(SqlOperator op, String opName) {
      return "<INTERVAL>";
    }
  }
  