GrepReader.java Source code

Introduction

Here is the source code for GrepReader.java

Source

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;

public class GrepReader extends BufferedReader {
    String pattern;

    public GrepReader(Reader in, String pattern) {
        super(in);
        this.pattern = pattern;
    }

    public final String readLine() throws IOException {
        String line;
        do {
            line = super.readLine();
        } while ((line != null) && line.indexOf(pattern) == -1);
        return line;
    }

    public static void main(String args[]) {
        try {
            GrepReader in = new GrepReader(new FileReader("GrepReader.java"), "GrepReader");
            String line;
            while ((line = in.readLine()) != null)
                System.out.println(line);
            in.close();
        } catch (Exception e) {
            System.err.println(e);
        }
    }
}