Widget.java

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import java.io.PrintWriter;
import java.util.Vector;
import java.io.Serializable;
import java.io.InputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public abstract class Widget
{
  public String prefix;
  public Form form;

  public boolean modal = false;

  public Vector children = new Vector();
  public Widget modalChild;

  public static final int GET = 1;
  public static final int POST = 2;
  public static final int BOTH = 3;

  public String name;
  public int method;

  public Widget(String prefix, Form form)
  {
    this.prefix = prefix;
    this.form = form;
  }

  public void addChild(Widget w)
  {
    children.add(w);
  }

  public void loadDefaults()
  {
    int l = children.size();
    for(int i = 0; i < l; ++i)
    {
      Widget w = (Widget)children.get(i);
      w.loadDefaults();
    }    
  }

  public void loadValues()
  {
    int l = children.size();
    for(int i = 0; i < l; ++i)
    {
      Widget w = (Widget)children.get(i);
      w.loadValues();
      if (w.modal) modalChild = w;
    }
  }

  public void display()
  {
    display(false);
  }

  public void display(boolean hidden)
  {
    if (hidden || modalChild != null)
    {
      int l = children.size();
      for(int i = 0; i < l; ++i)
      {
        Widget w = (Widget)children.get(i);
        w.display(!w.modal);
      }
    }
  }

  public void dumpscript() { }

  public String loadAttribute()
  {
    return form.req.getParameter(prefix);
  }

  public String loadAttribute(String name)
  {
    return form.req.getParameter(n(name));
  }

  public String n(String suffix)
  {
    return suffix != null ? prefix + "." + suffix : prefix;
  }

  public void printAttribute(String name, String value)
  {
    p("<input type=hidden name=\"" + n(name) + "\" value=\"" + htmlencode(value) + "\">");
  }

  public void preserveAttribute(String name)
  {
    String v = loadAttribute(name);
    if (v != null) printAttribute(name, v);
  }

  public void p(String str)
  {
    form.pw.print(str);
  }

  public void p(Exception e)
  {
    ShowException(e, form.pw);
  }

  public static String htmlencode(String v)
  {
    if (v == null) return "";
    StringBuffer b = new StringBuffer();
    int l = v.length();

    for(int i = 0; i < l; ++i)
    {
      char c = v.charAt(i);

      switch (c)
      {
        case '"':
          b.append("&quot;");
        break;
        case '<':
          b.append("&lt;");
        break;
        case '>':
          b.append("&gt;");
        break;
        case '&':
          b.append("&amp;");
        break;
        default:
          b.append(c);
        break;
      }
    }
    return b.toString();
  }

  public String serialize(Serializable o)
  {
    String r = null;
    try
    {
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      try
      {
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        try
        {
          oos.writeObject(o);
          oos.flush();
          r = Base64.encodeBytes(bos.toByteArray());
        }
        finally
        {
          oos.close();
        }
      }
      finally
      {
        bos.close();
      }
    }
    catch (java.io.IOException e)
    {
      p("<h1>Serialize IO Exception: " + e.toString() + "</h1>");
    }
    return r;
  }

  public Object unserialize(String s)
  {
    Object o = null;
    try
    {
      InputStream is = new ByteArrayInputStream(Base64.decode(s));
      try
      {
        ObjectInputStream ois = new ObjectInputStream(is);
        try
        {
          o = ois.readObject();
        }
        finally
        {
          ois.close();
        }
        is.close();
      }
      finally
      {
        is.close();
      }
    }
    catch (java.io.IOException e)
    {
      p(e);
    }
    catch (java.lang.ClassNotFoundException e)
    {
      p(e);
    }
    return o;
  }

  public int toInt(String str, int def)
  {
    try
    {
      return str == null ? def : Integer.parseInt(str);
    }
    catch (java.lang.NumberFormatException e)
    {
      return def;
    }
  }
  
  public static void ShowException(Throwable t, PrintWriter pw)
  {
    pw.println("</select>");
    pw.println("<h2>Exception Caught</h2>");
    pw.print("<pre style=\"background-color: #eeeeee\">");
    t.printStackTrace(pw);
    pw.println("</pre>");
  }
  
};

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