ZCensusParser.java

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package tutorial.programming.example08DemandGeneration;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public class ZCensusParser {
        
    private String separator = "\t";
    private Charset charset = Charset.forName("UTF-8");

    public List<ZCensusEntry> readFile(String inFile)
    {
        List<ZCensusEntry> entries = new ArrayList<ZCensusEntry>();
        
        FileInputStream fis = null;
        InputStreamReader isr = null;
        BufferedReader br = null;
        
        try 
        {
            fis = new FileInputStream(inFile);
            isr = new InputStreamReader(fis, charset);
            br = new BufferedReader(isr);
            
            // skip first Line
            br.readLine();
             
            String line;
            while((line = br.readLine()) != null)
            {
                ZCensusEntry censusEntry = new ZCensusEntry();
                
                String[] cols = line.split(separator);
                                
                censusEntry.id_person = parseInteger(cols[0]);
                censusEntry.wp = parseDouble(cols[1]);
                censusEntry.tripnum = parseInteger(cols[2]);
                censusEntry.starttime = parseInteger(cols[3]);
                censusEntry.h_x = parseDouble(cols[4]);
                censusEntry.h_y = parseDouble(cols[5]);
                censusEntry.s_x = parseDouble(cols[6]);
                censusEntry.s_y = parseDouble(cols[7]);
                censusEntry.d_x = parseDouble(cols[8]);
                censusEntry.d_y = parseDouble(cols[9]);
                censusEntry.bike = parseInteger(cols[10]);
                censusEntry.age = parseInteger(cols[11]);
                censusEntry.gender = parseInteger(cols[12]);
                censusEntry.license = parseInteger(cols[13]);
                censusEntry.tickets = parseInteger(cols[14]);
                censusEntry.modechoice = parseInteger(cols[15]);
                censusEntry.caravailability = parseInteger(cols[16]);
                censusEntry.mobtools = parseInteger(cols[17]);
                censusEntry.inc1000 = parseDouble(cols[18]);
                censusEntry.day = parseInteger(cols[19]);
                censusEntry.tripmode = parseInteger(cols[20]);
                censusEntry.trippurpose = parseInteger(cols[21]);
                censusEntry.tripdistance = parseDouble(cols[22]);
                censusEntry.tripduration = parseInteger(cols[23]);
                censusEntry.id_tour = parseInteger(cols[24]);
                                
                entries.add(censusEntry);
            }
            
            br.close();
            isr.close();
            fis.close();
        }
        catch (FileNotFoundException e) 
        {
            e.printStackTrace();
        }
        catch (IOException e) 
        {
            e.printStackTrace();
        }
        
        return entries;
    }
    
    private int parseInteger(String string)
    {
        if (string == null) return 0;
        else if (string.trim().isEmpty()) return 0;
        else return Integer.valueOf(string);
    }
    
    private double parseDouble(String string)
    {
        if (string == null) return 0.0;
        else if (string.trim().isEmpty()) return 0.0;
        else return Double.valueOf(string);
    }
}