source: main/trunk/greenstone3/src/java/org/greenstone/admin/guiext/Option.java@ 22185

package org.greenstone.admin.guiext;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import javax.swing.ImageIcon;
import javax.swing.JTable;

import org.greenstone.admin.GAI;

import org.w3c.dom.Element;

public class Option
{
    protected String _type = null;
    protected String _name = null;
    protected String _id = null;
    protected String _value = null;    
    protected OptionList _parent = null;
    
    protected Object _classObject = null;
    protected Method _checkMethod = null;

    protected ImageIcon _image = null;

    private boolean _canCheck = false;
    private int _checkResult = -1;

    private final String GOOD_ICON = GAI.getGSDL3Home() + System.getProperty("file.separator") + "resources" + System.getProperty("file.separator") + "images" + System.getProperty("file.separator") + "icongreentick.png";
    private final String BAD_ICON = GAI.getGSDL3Home() + System.getProperty("file.separator") + "resources" + System.getProperty("file.separator") + "images" + System.getProperty("file.separator") + "iconredexclamation.png";
    private final String ERROR_ICON = GAI.getGSDL3Home() + System.getProperty("file.separator") + "resources" + System.getProperty("file.separator") + "images" + System.getProperty("file.separator") + "iconorangetriange.png";

    public Option(Element optionElement, OptionList parent)
    {
    _parent = parent;

    if(optionElement != null){
        _id = optionElement.getAttribute("id");
        if(_id == null || _id.equals("")){
        System.err.println("This option element does not have an id");
        }

        _name = optionElement.getAttribute("label");
        if(_name == null || _name.equals("")){
        _name = _id;
        }
        
        _value = ExtXMLHelper.getValueFromSingleElement(optionElement, false);
        
        if(_value == null){
        _value = "";
        }

        String checkClass = optionElement.getAttribute("checkClass");
        String checkMethod = optionElement.getAttribute("checkMethod");

        if(!checkClass.equals("") && !checkMethod.equals("")){
        loadCheckMethod(checkClass, checkMethod);
        }

        performCheck();

        _type = optionElement.getAttribute("type");
        
        if(!(_type.equals("") || _type.equals("password") || _type.equals("filebrowse") || _type.equals("folderbrowse"))){
        System.err.println("This option element specifies a type that is not \"password\", \"filebrowse\" or \"folderbrowse\"");        
        }
    }
    else{
        System.err.println("This <" + ExtXMLHelper.OPTION + "> element is null");
    }
    }

    private void loadCheckMethod(String checkClassString, String checkMethodString)
    {
    _parent.getParent().getParent().getParent().loadGuiExtFile();
    
    Class checkClass = null;
    try{
        checkClass = Class.forName(checkClassString);
    }
    catch(Exception ex){
        System.err.println("Could not get an instance of the check class, either the class name is incorrect or the class does not exist inside the guiext.jar file");
        return;
    }
    
    try{
        Constructor classConstructor = checkClass.getConstructor(new Class[0]);
        _classObject = classConstructor.newInstance(new Object[0]);
    }
    catch(Exception ex){
        System.err.println("Could not instantiate the check class, either the class name is incorrect or the class does not exist inside the guiext.jar file");
        return;
    }

    try{
        _checkMethod = checkClass.getDeclaredMethod(checkMethodString, new Class[]{Object.class});
    }
    catch(Exception ex){
        System.err.println("Could not get the check method, either the method name is incorrect or the method does not take an Object as a parameter");
        return;
    }
       
    if(!(_checkMethod.getReturnType().equals(Boolean.TYPE))){
        System.err.println("The check method does not return a boolean value as is required");
        return;
    }
    _canCheck = true;
    }

    private void setImageFromCheck()
    {
    if(_canCheck){
        if(_checkResult == 0){
        _image = new ImageIcon(GOOD_ICON);
        }
        else if(_checkResult == 1){
        _image = new ImageIcon(BAD_ICON);
        }
        else{
        _image = new ImageIcon(ERROR_ICON);
        }
    }
    else{
        _image = new ImageIcon(GOOD_ICON);
    }
    }
    
    private void performCheck()
    {
    if(_canCheck){
        Boolean result = null;
        try{
        result = ((Boolean)_checkMethod.invoke(_classObject, new Object[]{_value}));
        }
        catch(Exception ex){
        _checkResult = -1;
        }
        if(result){
        _checkResult = 0;
        }
        else{
        _checkResult = 1;
        }
    }
    setImageFromCheck();
    }

    public boolean isCheckable()
    {
    return _canCheck;
    }

    public int getCheckResult()
    {
    return _checkResult;
    }
    
    public String getName()
    {
    return _name;
    }

    public String getValue()
    {
    return _value;
    }

    public void setValue(String value)
    {
    _value = value;
    performCheck();

    JTable table = _parent.getParent().getTableFromOptionList(_parent);
    
    if(table != null){
        table.repaint();
        table.revalidate();
    }
    }

    public String getId()
    {
    return _id;
    }
    
    public OptionList getParent()
    {
    return _parent;
    }
    
    public String getType()
    {
    return _type;
    }

    public ImageIcon getImage()
    {
    return _image;
    }
}