Contents - Cultural View

New I/O 235
// Pattern used to parse lines
private static Pattern linePattern = Pattern.compile(".*\r?\n");
// The input pattern that we're looking for
private static Pattern pattern;
// Compile the pattern from the command line
private static void compile(String pat) {
}
applying
try {
pattern = Pattern.compile(pat);
} catch (PatternSyntaxException x) {
}
System.err.println(x.getMessage());
System.exit(1);
// Use the linePattern to break the given CharBuffer into lines,
// the input pattern to each line to see if we have a match
private static void grep(File f, CharBuffer cb) {
}
Matcher lm = linePattern.matcher(cb); // Line matcher
Matcher pm = null; // Pattern matcher
int lines = 0;
while (lm.find()) {
}
lines++;
CharSequence cs = lm.group(); // The current line
if (pm == null)
else
pm = pattern.matcher(cs);
pm.reset(cs);
if (pm.find())
System.out.print(f + ":" + lines + ":" + cs);
if (lm.end() == cb.limit())
break;
// Search for occurrences of the input pattern in the given file
private static void grep(File f) throws IOException {
// Open the file and then get a channel from the stream
FileInputStream fis = new FileInputStream(f);
FileChannel fc = fis.getChannel();
// Get the file's size and then map it into memory
int sz = (int)fc.size();
MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0,