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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 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.fun;

import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;

/**
 * Common base for the CONVERT and TRANSLATE
 * functions.
 */
public class SqlConvertFunction extends SqlFunction {
  //~ Constructors -----------------------------------------------------------

  protected SqlConvertFunction(String name) {
    super(
        name,
        SqlKind.OTHER_FUNCTION,
        null,
        null,
        null,
        SqlFunctionCategory.STRING);
  }

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

  @Override public void unparse(
      SqlWriter writer,
      SqlCall call,
      int leftPrec,
      int rightPrec) {
    final SqlWriter.Frame frame = writer.startFunCall(getName());
    call.operand(0).unparse(writer, leftPrec, rightPrec);
    writer.sep("USING");
    call.operand(1).unparse(writer, leftPrec, rightPrec);
    writer.endFunCall(frame);
  }

  @Override public String getSignatureTemplate(final int operandsCount) {
    switch (operandsCount) {
    case 2:
      return "{0}({1} USING {2})";
    default:
      break;
    }
    throw new IllegalStateException("operandsCount should be 2, got " + operandsCount);
  }
}