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.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlCallBinding;
  
  import com.google.common.collect.ImmutableList;
  
  /**
   * ExplicitOperandTypeInferences implements {@link SqlOperandTypeInference} by
   * explicitly supplying a type for each parameter.
   */
  public class ExplicitOperandTypeInference implements SqlOperandTypeInference {
    //~ Instance fields --------------------------------------------------------
  
    private final ImmutableList<RelDataType> paramTypes;
  
    //~ Constructors -----------------------------------------------------------
  
    /** Use
     * {@link org.apache.calcite.sql.type.InferTypes#explicit(java.util.List)}. */
    ExplicitOperandTypeInference(ImmutableList<RelDataType> paramTypes) {
      this.paramTypes = paramTypes;
    }
  
    //~ Methods ----------------------------------------------------------------
  
    @Override public void inferOperandTypes(
        SqlCallBinding callBinding,
        RelDataType returnType,
        RelDataType[] operandTypes) {
      if (operandTypes.length != paramTypes.size()) {
        // This call does not match the inference strategy.
        // It's likely that we're just about to give a validation error.
        // Don't make a fuss, just give up.
        return;
      }
      @SuppressWarnings("all")
      RelDataType[] unused = paramTypes.toArray(operandTypes);
    }
  }
  