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

/** This class is a reference from a web link. In an html context this
 *  is the data contained by the href attribute of a hyperlink. In other
 *  contexts it will mean other things.
 *  @author matth3wbishop<at>yahoo!<dot>com 
 *  @See Document, Form, Value, Link, Field
 */
 
  
public class Reference extends Object
{
  //--------------------------------------------
  private static String NEWLINE = System.getProperty("line.separator");
  //--------------------------------------------
  /** what the reference refers to, sometimes a Url */
  private Value target;  
  //--------------------------------------------
  private boolean isGood;
  

  //--------------------------------------------
  public Reference()
  {
    //this.target = new Value();  
  } //-- constr: ()

  //--------------------------------------------
  /** construct with html text */
  public Reference(String sText)
  {
    this();

    this.loadData(sText);
  } //-- constr: (string)


  //--------------------------------------------
  /** load data from text */
  public void loadData(String sText)
  {
    this.isGood = this.isReference(sText);
    if (!this.isGood)
    {
      this.target = new Value();
      return;
    }

    this.target = new Value(sText.substring(sText.indexOf("=") + 1));


  } //-- method: loadData

  //--------------------------------------------
  public String getPointer()
  {
    return this.target.getContent();
  }

  //--------------------------------------------
  public Value getTarget()
  {
    return this.target;
  }

  //--------------------------------------------
  public void setTarget(String sTarget)
  {
    this.target.setContent(sTarget);
  }

  //--------------------------------------------
  /** checks if this looks like a Reference */
  public static boolean isReference(String sText)
  {
    if (sText.trim().length() == 0)
     { return false; }

    if (sText.indexOf("=") == -1)
      { return false; }

    if (!sText.toLowerCase().trim().startsWith("href"))
      { return false; }

    String sTest = sText.trim().substring("HREF".length());
    //System.out.println("stest =" + sTest);

    if (!sTest.trim().startsWith("="))
      { return false; }

    String sValueText;
    sValueText = sText.substring(sText.indexOf("=") + 1);

    //System.out.println("sValueText=" + sValueText);
    if (!Value.isValue(sValueText))    
      { return false; }

    return true;
  }

  //--------------------------------------------
  public String toString()
  {
    StringBuffer sbReturn = new StringBuffer("");
    sbReturn.append("href=" + this.target.toString());
    return sbReturn.toString();
  }

  //--------------------------------------------
  public String printReport()
  {
    StringBuffer sbReturn = new StringBuffer("");
    sbReturn.append("Content of the target:" + this.target.getContent());
    sbReturn.append(NEWLINE);
    sbReturn.append("Reference is in good format:" + this.isGood);
    sbReturn.append(NEWLINE);
    return sbReturn.toString();
  }

  //--------------------------------------------
  public String print()
  {
    StringBuffer sbReturn = new StringBuffer("");
    sbReturn.append("target=" + this.target);
    return sbReturn.toString();
  }

  //--------------------------------------------
  /** a main method for testing */
  public static void main(String[] args) throws Exception
  {
    
    StringBuffer sbUsageMessage = new StringBuffer("");
    sbUsageMessage.append("test usage: java Reference test");
    sbUsageMessage.append(NEWLINE);
    sbUsageMessage.append(" eg  java Reference 'href = http://bumble.sf.net' ");
    sbUsageMessage.append(NEWLINE);


    if (args.length == 0)
    {	    
      System.out.println(sbUsageMessage);
      System.exit(-1);
    }
    /*
    BufferedReader brInput =
      new BufferedReader(new InputStreamReader(System.in));
    int iInput = 0;
    char cInput = ' ';

    StringBuffer sbInput = new StringBuffer("");

    System.out.println("Testing the Reference Class");
    System.out.println("Type * to finish");
    while (cInput != '*')
    {
      sbInput.append(cInput);
      cInput = (char)brInput.read();
    }

    Reference rTest = new Reference(sbInput.toString());
    */

    Reference rTest = new Reference(args[0]);
    StringBuffer sbMessage = new StringBuffer("");
    sbMessage.append(rTest.print());
    sbMessage.append(NEWLINE);
    sbMessage.append(rTest.printReport());

 
    System.out.println(sbMessage);
  } //-- main()
  
} //-- Reference class