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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;

import com.hazelcast.org.apache.calcite.sql.parser.SqlParserPos;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
import com.hazelcast.org.apache.calcite.util.Bug;
import com.hazelcast.org.apache.calcite.util.NlsString;
import com.hazelcast.org.apache.calcite.util.Util;

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

import java.util.List;
import java.util.Objects;

/**
 * A character string literal.
 *
 * Its {@link #value} field is an {@link NlsString} and
 * {@link #getTypeName typeName} is {@link SqlTypeName#CHAR}.
 */
public class SqlCharStringLiteral extends SqlAbstractStringLiteral {

  //~ Constructors -----------------------------------------------------------

  protected SqlCharStringLiteral(NlsString val, SqlParserPos pos) {
    super(val, SqlTypeName.CHAR, pos);
  }

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

  /**
   * Returns the underlying NlsString.
   *
   * @deprecated Use {@link #getValueAs getValueAs(NlsString.class)}
   */
  @Deprecated // to be removed before 2.0
  public NlsString getNlsString() {
    return getValueNonNull();
  }

  private NlsString getValueNonNull() {
    return (NlsString) Objects.requireNonNull(value, "value");
  }
  /**
   * Returns the collation.
   */
  public @Nullable SqlCollation getCollation() {
    return getValueNonNull().getCollation();
  }

  @Override public SqlCharStringLiteral clone(SqlParserPos pos) {
    return new SqlCharStringLiteral(getValueNonNull(), pos);
  }

  @Override public void unparse(
      SqlWriter writer,
      int leftPrec,
      int rightPrec) {
    final NlsString nlsString = getValueNonNull();
    if (false) {
      Util.discard(Bug.FRG78_FIXED);
      String stringValue = nlsString.getValue();
      writer.literal(
          writer.getDialect().quoteStringLiteral(stringValue));
    }
    writer.literal(nlsString.asSql(true, true, writer.getDialect()));
  }

  @Override protected SqlAbstractStringLiteral concat1(List literals) {
    return new SqlCharStringLiteral(
        NlsString.concat(
            Util.transform(literals,
                literal -> literal.getValueAs(NlsString.class))),
        literals.get(0).getParserPosition());
  }
}