aeds2/tps/fonte/tp02/TP02Q03 - Pesquisa Sequencial em Java/Arq.java

import java.io.*;
import java.util.Formatter;
import java.util.Scanner;
import java.io.File;
import java.nio.charset.*;

public class Arq
{
   private static String nomeArquivo = "";
   private static String charsetArquivo = "ISO-8859-1";
   private static boolean write = false, read = false;
   private static Formatter saida = null;
   private static Scanner entrada = null;

	public static boolean openWrite(String nomeArq, String charset) {
      boolean resp = false;
      close();
		try{
		   saida = new Formatter(nomeArq, charset);
         nomeArquivo = nomeArq;
         resp = write = true;
		}  catch (Exception e) {}
      return resp;
   }

	public static boolean openWrite(String nomeArq) {
      return openWrite(nomeArq, charsetArquivo);
   }

	public static boolean openWriteClose(String nomeArq, String charset, String conteudo) {
      boolean resp = openWrite(nomeArq, charset);
      if(resp == true){
         println(conteudo);
         close();
      }
      return resp;
   }

	public static boolean openWriteClose(String nomeArq, String conteudo) {
      return openWriteClose(nomeArq, charsetArquivo, conteudo);
   }

	public static boolean openRead(String nomeArq) {
      return openRead(nomeArq, charsetArquivo);
   }

	public static boolean openRead(String nomeArq, String charset) {
      boolean resp = false;
      close();
		try{
         entrada = new Scanner(new File(nomeArq), charset);
         nomeArquivo = nomeArq;
         resp = read = true;
		}  catch (Exception e) {}
      return resp;
   }

   public static String openReadClose(String nomeArq){
      openRead(nomeArq);
      String resp = readAll();
      close();
      return resp;
   }

	public static void close() {
      if(write == true){
         saida.close();
      }
      if(read == true){
         entrada.close();
      }
      write = read = false;
      nomeArquivo = "";
      charsetArquivo = "ISO-8859-1";
	}

   public static long length(){
      long resp = -1;
      if(read != write){
         File file = new File(nomeArquivo);
         resp = file.length();
      }
      return resp;
   }

   public static void print(int x){
      if(write == true){
		   saida.format( "%d", x);
      }
   }

   public static void print(double x){
      if(write == true){
	   	saida.format( "%f", x);
      }
   }

   public static void print(String x){
      if(write == true){
   		saida.format( "%s", x);
      }
   }

   public static void print(boolean x){
      if(write == true){
		   saida.format( "%s", ((x) ? "true" : "false"));
      }
   }

   public static void print(char x){
      if(write == true){
	   	saida.format( "%c", x);
      }
   }

   public static void println(int x){
      if(write == true){
   		saida.format( "%d\n", x);
      }
   }

   public static void println(double x){
      if(write == true){
		   saida.format( "%f\n", x);
      }
   }

   public static void println(String x){
      if(write == true){
	   	saida.format( "%s\n", x);
      }
   }

   public static void println(boolean x){
      if(write == true){
   		saida.format( "%s\n", ((x) ? "true" : "false"));
      }
   }

   public static void println(char x){
      if(write == true){
		   saida.format( "%c\n", x);
      }
   }

   public static int readInt(){
      int resp = -1;
		try{
         resp = entrada.nextInt();
		}  catch (Exception e) {}
      return resp;
   }

   public static char readChar(){
      char resp = ' ';
		try{
         resp = (char)entrada.nextByte();
		}  catch (Exception e) {}
      return resp;
   }

   public static double readDouble(){
      double resp = -1;
		try{
         resp = Double.parseDouble(readString().replace(",","."));
		}  catch (Exception e) {}
      return resp;
   }

   public static String readString(){
      String resp = "";
		try{
         resp = entrada.next();
		}  catch (Exception e) { System.out.println(e.getMessage()); }
      return resp;
	}

   public static boolean readBoolean(){
      boolean resp = false;
		try{
         resp = (entrada.next().equals("true")) ? true : false;
		}  catch (Exception e) {}
      return resp;
	}

   public static String readLine(){
      String resp = "";
		try{
         resp = entrada.nextLine();
		}  catch (Exception e) { System.out.println(e.getMessage()); }
      return resp;
	}


   public static boolean hasNext(){
      return entrada.hasNext();
   }

   public static String readAll(){
      String resp = "";
      while(hasNext()){
         resp += (readLine() + "\n");
      }
      return resp;
   }
}