source: main/trunk/greenstone3/src/java/org/greenstone/admin/guiext/Callback.java@ 21919

package org.greenstone.admin.guiext;

import java.lang.reflect.Method;
import javax.swing.JTextArea;

import org.w3c.dom.Element;

public class Callback implements Runnable
{
    String _param = null;
    CommandStep _parent = null;
    
    public Callback(Element callbackElement, CommandStep parent)
    {
    _parent = parent;

    if(callbackElement != null){
        _param = ExtXMLHelper.getValueFromSingleElement(callbackElement, true);
    }
    else{
        System.err.println("This <" + ExtXMLHelper.CALLBACK + "> element is null");
    }
    }

    public void run()
    {
    JTextArea messageArea = _parent.getMessageArea();

    Object extObj = _parent.getParent().getParent().getExtObject();
    Class[] params = new Class[]{String.class};
    
    Method callbackMethod = null;
    try{
        callbackMethod = extObj.getClass().getDeclaredMethod("doCallback", params);
    }
    catch(Exception ex){
        System.err.println("Specified class does not have a doCallback(String) method");
        _parent.threadError();
        return;
    }

    messageArea.append("\nCalling the callback method with \"" + _param +"\" as an argument");
    Boolean success = null;
    try{
        success = (Boolean)callbackMethod.invoke(extObj, (Object)_param);
    }
    catch(Exception ex){
        System.err.println("Error while attempting to invoke specified method -> ");
        ex.printStackTrace();
        _parent.threadError();
        return;
    }
    
    if(!success){
        System.err.println("Call to doCallback method with the value \"" + _param + "\" returned unsuccessfully");
        _parent.threadError();
        return;
    }

    _parent.startNextThread();
    }
    
    public String getParam()
    {
    return _param;
    }
    
    public CommandStep getParent()
    {
    return _parent;
    }
}