LineMap

```
public interface LineMap
```
Provides methods to convert between character positions and line numbers for a compilation unit.

Since:

1.6

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`getColumnNumber(long pos)`	Finds the column for a character position.
`long`	`getLineNumber(long pos)`	Finds the line containing a position; a line termination character is on the line it terminates.
`long`	`getPosition(long line, long column)`	Finds the position corresponding to a (line,column).
`long`	`getStartPosition(long line)`	Finds the start position of a line.

- Method Detail
  - getStartPosition
```
long getStartPosition(long line)
```
    Finds the start position of a line.
    
    Parameters:
    
    line - line number (beginning at 1)
    
    Returns:
    
    position of first character in line
    
    Throws:
    
    IndexOutOfBoundsException - if lineNumber < 1 if lineNumber > no. of lines
  - getPosition
```
long getPosition(long line,
                 long column)
```
    Finds the position corresponding to a (line,column).
    
    Parameters:
    
    line - line number (beginning at 1)
    
    column - tab-expanded column number (beginning 1)
    
    Returns:
    
    position of character
    
    Throws:
    
    IndexOutOfBoundsException - if line < 1 if line > no. of lines
  - getLineNumber
```
long getLineNumber(long pos)
```
    Finds the line containing a position; a line termination character is on the line it terminates.
    
    Parameters:
    
    pos - character offset of the position
    
    Returns:
    
    the line number of pos (first line is 1)
  - getColumnNumber
```
long getColumnNumber(long pos)
```
    Finds the column for a character position. Tab characters preceding the position on the same line will be expanded when calculating the column number.
    
    Parameters:
    
    pos - character offset of the position
    
    Returns:
    
    the tab-expanded column number of pos (first column is 1)