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.SqlNode;
  import org.apache.calcite.sql.SqlUtil;
  
  import static org.apache.calcite.util.Static.RESOURCE;
  
  /**
   * Parameter type-checking strategy where all operand types must not be NULL.
   */
  public class NotNullOperandTypeChecker extends SameOperandTypeChecker {
    //~ Instance fields --------------------------------------------------------
  
    private final boolean allowCast;
  
    //~ Constructors -----------------------------------------------------------
  
    public NotNullOperandTypeChecker(final int nOperands, final boolean allowCast) {
      super(nOperands);
      this.allowCast = allowCast;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public boolean checkOperandTypes(final SqlCallBinding callBinding,
        final boolean throwOnFailure) {
      // no operand can be null for type-checking to succeed
      for (SqlNode node : callBinding.operands()) {
        if (SqlUtil.isNullLiteral(node, allowCast)) {
          if (throwOnFailure) {
            throw callBinding.getValidator().newValidationError(node, RESOURCE.nullIllegal());
          } else {
            return false;
          }
        }
      }
      return true;
    }
  }
  