constrained values

[oll3i]

public void setValue(T newValue) throws PropertyVetoException {

      T old = value;
      //veto.fireVetoableChange(value,old,newValue);
      veto.fireVetoableChange("value",
              new  ? (old),
              new  ? (newValue));

      value = newValue;
      changes.firePropertyChange(name, old, value);
    }

what shd be there where ? are

[RedSon]

What is the method siganture of fireVetoableCha nge?

[sicarie]

oll3i-

Please do not double-post - you have already started a thread on this subject.

[oll3i]

i dont know what u mean but here is teh code

package zad12;




import java.beans.*;
import java.io.*;
import java.util.*;
import java.lang.reflect.*;

abstract class AbstractBean implements Serializable {

  protected PropertyChangeSupport changes = new PropertyChangeSupport(this);
  protected VetoableChangeSupport veto = new VetoableChangeSupport(this);

  public void addPropertyChangeListener(PropertyChangeListener pcl) {
	  changes.addPropertyChangeListener(pcl);
  }

  public void removePropertyChangeListener(PropertyChangeListener pcl) {
	  changes.addPropertyChangeListener(pcl);
  }

  class BoundedProperty<T>  implements PropertyChangeListener {
    private String name;
    private T value;
  
    private Object chgHandlerObject;
    private Method changeHandler;

    public BoundedProperty(String name) {
      this.name = name;
    }

    public T getValue() { return value; }

    public void setValue(T newValue) throws PropertyVetoException {

      T old = value;
      //veto.fireVetoableChange(value,old,newValue);
      veto.fireVetoableChange("value",
              new ?(old),
              new ?(newValue));

      value = newValue;
      changes.firePropertyChange(name, old, value);
    }
    
    
   
    
    
    
    public void propertyChange(PropertyChangeEvent e) {
      if (!e.getPropertyName().equals(name)) return;
      if (changeHandler == null) return;
      try {
        changeHandler.invoke(chgHandlerObject);
      } catch(Exception exc) {
          exc.printStackTrace();
      }
    }

    public void setChangeHandler(Object handl, String mname) {
      try {
        Method m = handl.getClass().getDeclaredMethod(mname);
        chgHandlerObject = handl;
        changeHandler = m;
       changes.addPropertyChangeListener(this);
      } catch(Exception exc) {
          exc.printStackTrace();
          return;
      }
    }

    public void setChangeHandler(Object ohandler) {
      try {
        Method m = ohandler.getClass().getDeclaredMethod(name+"Change");
        chgHandlerObject = ohandler;
        changeHandler = m;
      } catch(Exception exc) {
          exc.printStackTrace();
          return;
      }
      changes.addPropertyChangeListener(this);
    }

    public void removeChangeHandler() {
      changeHandler = null;
      chgHandlerObject = null;
      changes.removePropertyChangeListener(this);
    }
  }


}

[oll3i]

i just started learning java sorry for so many questions i ask and thank u for ur patience

[RedSon]

I don't need to look at your code, I am interested in what the API is for fireVetoableCha nge().

There should be either a java document or a java source file that says something like

fireVetoableChange(String aString, Something aSomething, OtherSomething aOtherSomething)

What does the API say that is? Or what does the java source say that it is?

[r035198x]

public void setValue(T newValue) throws PropertyVetoException {
 
T old = value;
//veto.fireVetoableChange(value,old,newValue);
veto.fireVetoableChange("value",
new ? (old),
new ? (newValue));
 
value = newValue;
changes.firePropertyChange(name, old, value);
}

what shd be there where ? are

Any class whose constructor takes a T object as argument.

[oll3i]

thank u that worked :]

[oll3i]

i get an error in bean.text.setVa lue(napis.getOb ject());
it says
Exception in thread "main" java.lang.Error : Unresolved compilation problems:
The method setValue(Box) in the type AbstractBean.Bo undedProperty<B ox> is not applicable for the arguments (String)
The method setValue(Box) in the type AbstractBean.Bo undedProperty<B ox> is not applicable for the arguments (String)

at zad12.Extprops. <init>(Extprops .java)
at zad12.Extprops. main(Extprops.j ava)

but setValue takes T as argument and napis.getObject () returns T

package zad12;

import static java.awt.Color.BLACK;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyVetoException;

import javax.swing.JButton;
import javax.swing.JFrame;

public class Extprops extends JFrame {

	  JButton b = new JButton();
	  TestBean bean = new TestBean();
	 
	  Box <String> napis = new Box <String> ("JOE BLACK");
	  Color c = new Color(0, 0, 0);
	  public Extprops() throws PropertyVetoException {
   >>> here is the error >>> bean.text.setValue(napis.getObject());
	    bean.color.setValue(c);

	    b.setText(napis.getObject());
	    b.setForeground(bean.color.getValue());

	    b.addActionListener( new ActionListener() {
	         public void actionPerformed(ActionEvent e) {
	           try {
 >>> here is the error >>> bean.text.setValue(napis.getObject());
			} catch (PropertyVetoException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
	           try {
				bean.color.setValue(bean.color.getValue().brighter());
			} catch (PropertyVetoException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
	         }
	      });
	    bean.color.setChangeHandler(this);
	    bean.text.setChangeHandler(this);

	    add(b);
	    setSize(200,200);
	    setVisible(true);
	  }

	  public void colorChange() {
	    b.setForeground(bean.color.getValue().brighter().brighter());
	  }

	  public void textChange() {
	    b.setText(napis.getObject());
	  }



	  public static void main(String[] args)  throws PropertyVetoException{
	     new Extprops();
	  }


	}

[oll3i]

i made it all work ;]

[r035198x]

i made it all work ;]

Good for you .