| Code with Finding: |
class SourceFile {
/**
* Get a region around the indicated line number. The exact definition of a
* region is implementation specific, but it must contain the line indicated
* by the line number. A region must not start or end by a carriage return.
*
* @param lineNumber the line number, 1 being the first line of the file.
* @return The line indicated. Returns {@code null} if it does not exist,
* or if there was an IO exception.
*/
public Region getRegion(int lineNumber) {
String js = "";
try {
js = getCode();
} catch (IOException e) {
return null;
}
int pos = 0;
int startLine = Math.max(1,
lineNumber - (SOURCE_EXCERPT_REGION_LENGTH + 1) / 2 + 1);
for (int n = 1; n < startLine; n++) {
int nextpos = js.indexOf('\n', pos);
if (nextpos == -1) {
break;
}
pos = nextpos + 1;
}
int end = pos;
int endLine = startLine;
for (int n = 0; n < SOURCE_EXCERPT_REGION_LENGTH; n++, endLine++) {
end = js.indexOf('\n', end);
if (end == -1) {
break;
}
end++;
}
if (lineNumber >= endLine) {
return null;
}
if (end == -1) {
int last = js.length() - 1;
if (js.charAt(last) == '\n') {
return
new SimpleRegion(startLine, endLine, js.substring(pos, last));
} else {
return new SimpleRegion(startLine, endLine, js.substring(pos));
}
} else {
return new SimpleRegion(startLine, endLine, js.substring(pos, end));
}
}
}
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