import java.io.RandomAccessFile;

import java.io.IOException;

public class UsePartsDB{

public static void main(String[] args) throws IOException{

PartsDB pdb = null;

pdb = new PartsDB("parts.db");

if(pdb.numRecs()==0){

// populate the database with records.

pdb.append("1-9009-3323-4x", "Wiper Blade Micro Edge", 30, 2468);

pdb.append("1-3233-44923-7j", "Parking Brake Cable", 5, 1439);

pdb.append("2-3399-6693-2m", "Halogen Bulb H4 55/60W", 22,813);

pdb.append("2-599-2029-6k", "Turbo Oil Line O-Ring", 26, 155);

pdb.append("3-1299-3299-9u", "Air Pump Electric", 9, 20200);

}

dumpRecords(pdb);

pdb.update(1, "1-3233-44923-7j", "Parking Brake Cable", 5, 1995);

dumpRecords(pdb);

pdb.close();

}

static void dumpRecords(PartsDB pdb) throws IOException{

for(int i=0;i<pdb.numRecs();i++){

PartsDB.Part part = pdb.select(i);

System.out.print(format(part.getPartnum(), PartsDB.PART_NUM_LENGTH, true));

System.out.print(" | ");

System.out.print(format(part.getDesc(), PartsDB.DESC_LENGTH, true));

System.out.print(" | ");

System.out.print(format("" + part.getQuantity(), 10, false));

System.out.print(" | ");

String unitCostString = part.getUnitCost()/100 + "." + part.getUnitCost()%100/10 + part.getUnitCost()%10;

System.out.println(format(unitCostString, 10, false));

}

System.out.println("Number of records = " + pdb.numRecs());

System.out.println();

}

static String format(String value, int maxWidth, boolean leftAlign){

StringBuffer sb = new StringBuffer();

int len = value.length();

if(len>maxWidth){

len = maxWidth;

value = value.substring(0, len);

}

if(leftAlign){

sb.append(value);

for(int i=0; i<maxWidth-len;i++){

sb.append(" ");

}

}else{

for(int i=0;i<maxWidth-len;i++){

sb.append(" ");

}

sb.append(value);

}

return sb.toString();

}

}