Grep.java

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package edu.rice.cs.hpc.data.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/***
 * 
 * grep class
 *
 */
public class Grep 
{

    static public void grep(String fin, String fout, String pattern, boolean shouldMatch)
            throws IOException
    {
        // using specific grep to remove metric tag
        removeMetrics(fin, fout);
    }
    
    
    /***
     * Simplified grep specifically against metric tags in an xml file
     * This method is not a generic grep, it assumes that all tags are fit in one line
     * 
     * @param fin
     * @param fout
     * @throws IOException
     */
    private static void removeMetrics(String fin, String fout) 
            throws IOException 
    {
        //String encoding = "UTF-8";
        
        final BufferedReader inputFile = new BufferedReader(new InputStreamReader(new FileInputStream(fin)));
        final BufferedWriter outputFile = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fout))); 
        
        Pattern metricTag = Pattern.compile("<M ");
        Matcher matcher = metricTag.matcher("");
        
        String inputLine;
        while ((inputLine = inputFile.readLine()) != null) {
            matcher.reset(inputLine);
            if (!matcher.lookingAt()) {
                outputFile.write(inputLine);
                outputFile.newLine();
            }
        }
        inputFile.close();
        outputFile.close();
    }

    static public void main(String args[])
    {
        if (args.length>1)
        {
            final String file = args[0];
            final String fout = args[1];
            try {
                Grep.removeMetrics(file, fout);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}