package com.quantum.util.versioning;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.FontDialog;

/**
 * This class provides backward compatibility between versions of Eclipse for
 * known differences.
 * 
 * @author BC
 */
public class VersioningHelper {
    
    public static final int ECLIPSE_VERSION_2_1_1 = 2135;

    /**
     * Set the font in a FontDialog.  In Eclipse 2.1.1, the 
     * <code>setFontData()</code> method was deprecated and an alternative
     * method, <code>setFontList()</code> was suggested in its place.  
     * 
     * @param fontDialog
     * @param fontData
     */    
    public static void setFont(FontDialog fontDialog, FontData[] fontData) {
        try {
            if (SWT.getVersion() >= ECLIPSE_VERSION_2_1_1) {
                Method method = fontDialog.getClass().getMethod(
                    "setFontList", new Class[] { fontData.getClass()});
                method.invoke(fontDialog, new Object[] {fontData});
            } else if (fontData.length > 0) {
                Method method = fontDialog.getClass().getMethod(
                    "setFontData", new Class[] { FontData.class });
                method.invoke(fontDialog, new Object[] { fontData[0] });
            }
        } catch (NoSuchMethodException e) {
            // should not happen
        } catch (IllegalArgumentException e) {
            // should not happen
        } catch (IllegalAccessException e) {
            // should not happen
        } catch (InvocationTargetException e) {
            // should not happen
        }
    }
}