content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  //     * Redistributions of source code must retain the above copyright
  // notice, this list of conditions and the following disclaimer.
  //     * Redistributions in binary form must reproduce the above
  // copyright notice, this list of conditions and the following disclaimer
  // in the documentation and/or other materials provided with the
  // distribution.
  //     * Neither the name of Google Inc. nor the names of its
  // contributors may be used to endorse or promote products derived from
  // this software without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  package com.google.protobuf;
  
  import java.util.Arrays;
  
  /**
   * A location in the source code.
   *
   * <p>A location is the starting line number and starting column number.
   */
  public final class TextFormatParseLocation {
  
    /** The empty location. */
    public static final TextFormatParseLocation EMPTY = new TextFormatParseLocation(-1, -1);
  
    /**
     * Create a location.
     *
     * @param line the starting line number
     * @param column the starting column number
     * @return a {@code ParseLocation}
     */
    static TextFormatParseLocation create(int line, int column) {
      if (line == -1 && column == -1) {
        return EMPTY;
      }
      if (line < 0 || column < 0) {
        throw new IllegalArgumentException(
            String.format("line and column values must be >= 0: line %d, column: %d", line, column));
      }
      return new TextFormatParseLocation(line, column);
    }
  
    private final int line;
    private final int column;
  
    private TextFormatParseLocation(int line, int column) {
      this.line = line;
      this.column = column;
    }
  
    public int getLine() {
      return line;
    }
  
    public int getColumn() {
      return column;
    }
  
    @Override
    public String toString() {
      return String.format("ParseLocation{line=%d, column=%d}", line, column);
    }
  
    @Override
    public boolean equals(Object o) {
      if (o == this) {
        return true;
      }
      if (!(o instanceof TextFormatParseLocation)) {
        return false;
      }
      TextFormatParseLocation that = (TextFormatParseLocation) o;
      return (this.line == that.getLine()) && (this.column == that.getColumn());
    }
  
    @Override
    public int hashCode() {
      int[] values = {line, column};
      return Arrays.hashCode(values);
    }
  }
  