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;
  
  import org.apache.calcite.sql.parser.SqlParserPos;
  import org.apache.calcite.sql.type.SqlTypeName;
  import org.apache.calcite.util.Bug;
  import org.apache.calcite.util.NlsString;
  import org.apache.calcite.util.Util;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.List;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A character string literal.
   *
   * <p>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) 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<SqlLiteral> literals) {
      return new SqlCharStringLiteral(
          NlsString.concat(
              Util.transform(literals,
                  literal -> literal.getValueAs(NlsString.class))),
          literals.get(0).getParserPosition());
    }
  }
  