import java.util.*;
import java.net.*;
import java.io.*; 

public class test {


  static BufferedInputStream bif;
  static int blksize;
  static String thisResponse="nothing";  

  public static void main(String args[]) {
    //    if(connect("http://osprey4.npac.syr.edu:8001/servlets/PostTest?where=here&what=that")) {
    if(connect("http://www.npac.syr.edu")) {
      while(!thisResponse.equals("EOF")){
        System.out.println(thisResponse);
        thisResponse=getBlock();
      }  
    closeConnection();
    }
 }

  public static boolean connect(String UrlString) {
    boolean status=true;
    UrlString += "what=what&where=where"; 
    try {
      URL url = new URL(UrlString);
      InputStream is = url.openStream();
      bif = new BufferedInputStream(is);
    } catch (Exception e) {
      System.out.println("cannot connect to "+UrlString);
      System.out.println(e.toString());
      status=false;
    }
    return status;
  } 

  public static void closeConnection() {
    System.out.println("close connection"); 
    try {
     if(bif != null) bif.close(); 
     else System.out.println("bif is already closed");
    } catch (Exception e) {
        System.out.println("cannot close input stream");
        System.out.println(e.toString());
    }
   bif=null; 
  } 

  public void setBlockSize(int size) {
    blksize=size;
  }

  public static String getBlock() {
    String response="";    
    byte[] a = null; 
    byte[] b = new byte[blksize];
    try {
       if(bif==null) System.out.println("bif is null");
       int icount = bif.read(b);
       System.out.println("icount="+icount);
       if(icount < 1) {
          response="EOF";
       }
       else { 
             if(icount == blksize) a=b;  //buffer filled
             else {
             a = new byte[icount];
             for(int i =0; i < icount; i++) a[i]=b[i];
	     }
             response=new String(a); 
       }
    }
    catch(Exception e) {
       System.out.println("IO Exception in getBlock");
       System.out.println(e);
    }


    /* you may want to modify a
       response=checkString(response,TargetHost);
    */
    if(response==null) response="null";
    return response;
  }

  public byte[] getBinaryBlock() {
    byte[] a = null; 
    byte[] b = new byte[blksize];
    try {
       if(bif==null) System.out.println("bif is null");
       int icount = bif.read(b);
       System.out.println("icount="+icount);
       if(icount == -1) {
          a = new byte[0];
       }
       else { 
             if(icount == blksize) a=b;  //buffer filled
             else {
             a = new byte[icount];
             for(int i =0; i < icount; i++) a[i]=b[i];
	     }
       }
    }
    catch(Exception e) {
       System.out.println("IO Exception in getBlock");
       System.out.println(e);
    }

    return a;
  }

  private  String checkString(String string, String TargetServer) {
    /* replaces relative references to absolute ones
       for example:
          <a href="/page.html"> to <a href="http://TargetServer/page.html">
    */

  String newString = removeAbsolute(string,"HREF",TargetServer); 
  newString = removeAbsolute(newString,"href",TargetServer); 
  newString = removeAbsolute(newString,"SRC",TargetServer); 
  newString = removeAbsolute(newString,"src",TargetServer); 
  return newString;
  }

  private String removeAbsolute(String string, String Tag, 
                                String TargetServer){

    String newstring = null;
    String temp,temp1,temp2; 

    temp1="";      
    int idx=string.indexOf(Tag);
    if(idx<0) return string;
    while(idx>-1) {
      newstring=string.substring(0,idx);
      temp=string.substring(idx);
      /* now temp starts with Tag: move Tag to newstring */
      int idx2 = temp.indexOf("=")+1;
      newstring += temp.substring(0,idx2);
      temp = temp.substring(idx2);
      /* now temp starts after = */  
        if(temp.startsWith("\"/") || 
           temp.startsWith(" \"/") ||
           temp.startsWith("/") || 
           temp.startsWith(" /")) {
           temp = "http://"+TargetServer+temp;
	}
       newstring += temp;  
       temp1 += newstring;
       string = temp;
       string=string.substring(Tag.length());
       idx=string.indexOf(Tag);
      }
      return temp1;
  }
  
  public String SayHello(){
      return "Hello from Charon!";
  }

  public synchronized void waitfordata() {
    try {
       System.out.println("wait"); 
       wait(100);
    } catch(Exception e) {};
  } 
}