examples/AddPerson.java

   1 // See README.md for information and build instructions.
   2
   3 import com.example.tutorial.protos.AddressBook;
   4 import com.example.tutorial.protos.Person;
   5 import java.io.BufferedReader;
   6 import java.io.FileInputStream;
   7 import java.io.FileNotFoundException;
   8 import java.io.FileOutputStream;
   9 import java.io.InputStreamReader;
  10 import java.io.IOException;
  11 import java.io.PrintStream;
  12
  13 class AddPerson {
  14   // This function fills in a Person message based on user input.
  15   static Person PromptForAddress(BufferedReader stdin,
  16                                  PrintStream stdout) throws IOException {
  17     Person.Builder person = Person.newBuilder();
  18
  19     stdout.print("Enter person ID: ");
  20     person.setId(Integer.valueOf(stdin.readLine()));
  21
  22     stdout.print("Enter name: ");
  23     person.setName(stdin.readLine());
  24
  25     stdout.print("Enter email address (blank for none): ");
  26     String email = stdin.readLine();
  27     if (email.length() > 0) {
  28       person.setEmail(email);
  29     }
  30
  31     while (true) {
  32       stdout.print("Enter a phone number (or leave blank to finish): ");
  33       String number = stdin.readLine();
  34       if (number.length() == 0) {
  35         break;
  36       }
  37
  38       Person.PhoneNumber.Builder phoneNumber =
  39         Person.PhoneNumber.newBuilder().setNumber(number);
  40
  41       stdout.print("Is this a mobile, home, or work phone? ");
  42       String type = stdin.readLine();
  43       if (type.equals("mobile")) {
  44         phoneNumber.setType(Person.PhoneType.MOBILE);
  45       } else if (type.equals("home")) {
  46         phoneNumber.setType(Person.PhoneType.HOME);
  47       } else if (type.equals("work")) {
  48         phoneNumber.setType(Person.PhoneType.WORK);
  49       } else {
  50         stdout.println("Unknown phone type.  Using default.");
  51       }
  52
  53       person.addPhones(phoneNumber);
  54     }
  55
  56     return person.build();
  57   }
  58
  59   // Main function:  Reads the entire address book from a file,
  60   //   adds one person based on user input, then writes it back out to the same
  61   //   file.
  62   public static void main(String[] args) throws Exception {
  63     if (args.length != 1) {
  64       System.err.println("Usage:  AddPerson ADDRESS_BOOK_FILE");
  65       System.exit(-1);
  66     }
  67
  68     AddressBook.Builder addressBook = AddressBook.newBuilder();
  69
  70     // Read the existing address book.
  71     try {
  72       FileInputStream input = new FileInputStream(args[0]);
  73       try {
  74         addressBook.mergeFrom(input);
  75       } finally {
  76         try { input.close(); } catch (Throwable ignore) {}
  77       }
  78     } catch (FileNotFoundException e) {
  79       System.out.println(args[0] + ": File not found.  Creating a new file.");
  80     }
  81
  82     // Add an address.
  83     addressBook.addPeople(
  84       PromptForAddress(new BufferedReader(new InputStreamReader(System.in)),
  85                        System.out));
  86
  87     // Write the new address book back to disk.
  88     FileOutputStream output = new FileOutputStream(args[0]);
  89     try {
  90       addressBook.build().writeTo(output);
  91     } finally {
  92       output.close();
  93     }
  94   }
  95 }