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SQL Parser and Optimizer
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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 com.hazelcast.com.liance with
 * the License.  You may obtain a copy of the License at
 *
 * http://www.apache.com.hazelcast.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;

import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
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.sql.type.SqlTypeUtil;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidator;
import com.hazelcast.org.apache.calcite.util.Litmus;
import com.hazelcast.org.apache.calcite.util.Util;

/**
 * A postfix unary operator.
 */
public class SqlPostfixOperator extends SqlOperator {
  //~ Constructors -----------------------------------------------------------

  public SqlPostfixOperator(
      String name,
      SqlKind kind,
      int prec,
      SqlReturnTypeInference returnTypeInference,
      SqlOperandTypeInference operandTypeInference,
      SqlOperandTypeChecker operandTypeChecker) {
    super(
        name,
        kind,
        leftPrec(prec, true),
        rightPrec(prec, true),
        returnTypeInference,
        operandTypeInference,
        operandTypeChecker);
  }

  //~ Methods ----------------------------------------------------------------

  public SqlSyntax getSyntax() {
    return SqlSyntax.POSTFIX;
  }

  public String getSignatureTemplate(final int operandsCount) {
    Util.discard(operandsCount);
    return "{1} {0}";
  }

  protected RelDataType adjustType(
      SqlValidator validator,
      SqlCall call,
      RelDataType type) {
    if (SqlTypeUtil.inCharFamily(type)) {
      // Determine coercibility and resulting collation name of
      // unary operator if needed.
      RelDataType operandType =
          validator.getValidatedNodeType(call.operand(0));
      if (null == operandType) {
        throw new AssertionError("operand's type should have been derived");
      }
      if (SqlTypeUtil.inCharFamily(operandType)) {
        SqlCollation collation = operandType.getCollation();
        assert null != collation
            : "An implicit or explicit collation should have been set";
        type =
            validator.getTypeFactory()
                .createTypeWithCharsetAndCollation(
                    type,
                    type.getCharset(),
                    collation);
      }
    }
    return type;
  }

  @Override public boolean validRexOperands(int count, Litmus litmus) {
    if (count != 1) {
      return litmus.fail("wrong operand count {} for {}", count, this);
    }
    return litmus.succeed();
  }
}