Decorative Mode 3-grep

[keywords]:java,design pattern, design patterns, "Java and schema" learning, decorator, decoration mode, Unix

[Environment]:staruml5.0 + JDK6

[Author]:winty (wintys@gmail.com)

[Body]:

 Package Pattern.decorator.grep Import java.io.*/** * Decorative mode (decorator pattern): grep * * grep is a command in UNIX, * use command
　grep BMW File ", * you can find the line containing BMW in file, and show. * * @version 2009-6-6 * @author winty (wintys@gmail.com) */public class grep{public static void Main (string[) args
　　 　　　 　) throws exception{Grepview view = new Grepview ();
　　 　　　 　　　 　if (Args.length < 2) {view.println ("Usage:java Grep targetstring fileName");
　　 　　　 　　　 　View.println ("E.g.:java Grep BMW c:/sample.txt");
　　 　　　 　System.exit (0);
　　 　　　 　} grepreader grep;
　　 　　　 　FileReader file = new FileReader (args[1]);
　　 　　　 　grep = new Grepreader (file, args[0], view);
　　 　Grep.search ();
　　 　} class Grepreader extends filterreader{private LineNumberReader reader;
　　 　Private String target;
　　 　Private Grepview view; /** * @param in the input stream in to find the target string * @param target to find the destination string * @param view Lookup results Output/public Grepreader (Re Ader in, String Target, GRepview view) {super (in);
　　 　　　 　reader = new LineNumberReader (in);
　　 　　　 　This.target = target;
　　 　This.view = view;
　　 　　　 　public void Search () throws exception{String = null;
　　 　　　 　　　 　while (line = Reader.readline ())!=null {int index =-1;
　　 　　　 　　　 　　　 　if (index = Line.indexof (target))!=-1) {String str;
　　 　　　 　　　 　　　 　str = "line" + reader.getlinenumber () + "column" + (index + 1) + ":" + line;
　　 　　　 　　　 　View.println (str);
　　 　} reader.close ();
　　 　} class grepview{private printstream out;
　　 　Public Grepview () {this.out = System.out;
　　 　public void println (String str) {out.println (str); }
}