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.util;
  
  import java.io.StringReader;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Extension to {@link StringReader} that allows the original string to be
   * recovered.
   */
  public class SourceStringReader extends StringReader {
    private final String s;
  
    /**
     * Creates a source string reader.
     *
     * @param s String providing the character stream
     */
    public SourceStringReader(String s) {
      super(s);
      this.s = requireNonNull(s, "s");
    }
  
    /** Returns the source string. */
    public String getSourceString() {
      return s;
    }
  }
  