package edu.calpoly.cpe205.fetter;
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.lang.reflect.*;
import java.lang.*;
import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;

/**
 * ParameterObjectComboBoxes hold references to Test Data Items of a
 * particular type. Users use the ParameterObjectComboBox to select one 
 * of these references so he/she can:<br>
 * <ul>
 * <li>change the value of a field (as in the Fields panel)</li>
 * <li>set a parameter for method to invoke (as in the Methods panel)</li>
 * <li>set a parameter for a constructor (as in the Instantiate Class
 *    dialog)</li>
 * </ul>
 */ 
// Author: Phillip Hansen
// Version History:
//   Nov 19, 2000 - comments/pseudocode added
//   Nov 30, 2000 - (Mike Hebron) updated class description
public class ParameterObjectComboBox extends JComboBox implements ParameterDataListener
{
    /**
     * Creates a new instance of a ParameterObjectComboBox
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: Creates a new instance of ParameterObjectComboBox
     * @param tn string containing the name of the type
     */
    public ParameterObjectComboBox(String tn)
    {
        // CALL addItem of this with tn
    	// SET typeName to tn
        addItem(tn);
        typeName = tn;
        /*
        setEditable(tn.equals("java.lang.String") || tn.equals("java.lang.Byte") ||
                    tn.equals("java.lang.Boolean") || tn.equals("java.lang.Character") ||
                    tn.equals("java.lang.Double") || tn.equals("java.lang.Float") ||
                    tn.equals("java.lang.Integer") || tn.equals("java.lang.Long") ||
                    tn.equals("java.lang.Short"));
        */
        getEditor().getEditorComponent().addMouseListener(new MouseAdapter() 
        {
            public void mouseClicked(MouseEvent evt) 
            {
                if (isEditable() && isEnabled()) getEditor().setItem("");
            }
        });
    }	

    /**
     * Returns the currently selected test data item
     * <p>
     * Pre-conditions: none<br>
     * Post Conditions: none
     */
    public Object getSelectedItem()
    {
        return dataModel.getElementAt(getSelectedIndex());
    }
    
    /**
     * selects the default 'no parameter object' value (aka 'the typename' string)
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: none
     */
    public void unselect()
    { 
        // CALL setSelectedIndex of JComboBox with 0 as parameter
        setSelectedIndex(0);
    }

    /**
     * returns the name of the type
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: returned value will be a string containing the name of the type
     * @returned String containing the name of the type
     */
    public String getTypeName()
    {
        // RETURN typeName
        return typeName;
    }

    /**
     * selects last item in combo box
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: none
     */
    public void selectLast()
    {
        // CALL getItemCount of JComboBox
        // CALL setSelectedIndex with value that was returned from getItemCount

        /* if empty, select 0; otherwise select (count - 1) */
        if (getItemCount() == 0)
        {
            setSelectedIndex(getItemCount());
        }
        else
        {
            setSelectedIndex(getItemCount() - 1);
        }
    }

    /**
     * informs the appropriate listeners when a parameter data item is changed
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: none
     * @param changed the ParameterDataInterface that was changed
     */
    public void parameterDataChanged(ParameterDataInterface changed)
    {
        // CALL repaint of JComboBox
    }

    /**
     * informs the appropriate listeners when a parameter data item is added
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: none
     * @param added the ParameterDataInterface that was added
     */
    public void parameterDataAdded(ParameterDataInterface added)
    {
        // CALL addElement of validSelections with added
        // CALL addItem of JComboBox with added
        addItem(added);
    }

    /**
     * informs the appropriate listeners when a parameter data item is removed
     * <P>
     * Pre-conditions: none<BR>
     * Post-conditions: none
     * @param removed the ParameterDataInterface that was removed
     */
    public void parameterDataRemoved(ParameterDataInterface removed)
    {
        // CALL removeElement of validSelections with removed
        // CALL removeItem of JComboBox with removed
        removeItem(removed);
    }

    /**
     * String containing the name of the types of data listed in the ComboBox
     */
    protected String typeName;

}