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/*
 * 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 com.hazelcast.org.apache.calcite.sql.validate;

import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.schema.AggregateFunction;
import com.hazelcast.org.apache.calcite.sql.SqlAggFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlIdentifier;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.type.SqlOperandMetadata;
import com.hazelcast.org.apache.calcite.sql.type.SqlOperandTypeChecker;
import com.hazelcast.org.apache.calcite.sql.type.SqlOperandTypeInference;
import com.hazelcast.org.apache.calcite.sql.type.SqlReturnTypeInference;
import com.hazelcast.org.apache.calcite.util.Optionality;
import com.hazelcast.org.apache.calcite.util.Util;

import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;

/**
 * User-defined aggregate function.
 *
 * Created by the validator, after resolving a function call to a function
 * defined in a Calcite schema.
 */
public class SqlUserDefinedAggFunction extends SqlAggFunction {
  public final AggregateFunction function;

  @Deprecated // to be removed before 2.0
  public SqlUserDefinedAggFunction(SqlIdentifier opName,
      SqlReturnTypeInference returnTypeInference,
      SqlOperandTypeInference operandTypeInference,
      @Nullable SqlOperandTypeChecker operandTypeChecker, AggregateFunction function,
      boolean requiresOrder, boolean requiresOver,
      Optionality requiresGroupOrder, RelDataTypeFactory typeFactory) {
    this(opName, SqlKind.OTHER_FUNCTION, returnTypeInference,
        operandTypeInference,
        operandTypeChecker instanceof SqlOperandMetadata
            ? (SqlOperandMetadata) operandTypeChecker : null, function,
        requiresOrder, requiresOver, requiresGroupOrder);
    Util.discard(typeFactory); // no longer used
  }

  /** Creates a SqlUserDefinedAggFunction. */
  public SqlUserDefinedAggFunction(SqlIdentifier opName, SqlKind kind,
      SqlReturnTypeInference returnTypeInference,
      SqlOperandTypeInference operandTypeInference,
      @Nullable SqlOperandMetadata operandMetadata, AggregateFunction function,
      boolean requiresOrder, boolean requiresOver,
      Optionality requiresGroupOrder) {
    super(Util.last(opName.names), opName, kind,
        returnTypeInference, operandTypeInference, operandMetadata,
        SqlFunctionCategory.USER_DEFINED_FUNCTION, requiresOrder, requiresOver,
        requiresGroupOrder);
    this.function = function;
  }

  @Override public @Nullable SqlOperandMetadata getOperandTypeChecker() {
    return (@Nullable SqlOperandMetadata) super.getOperandTypeChecker();
  }
}