ComponentTreeIcons.java

package abbot.editor;

import java.awt.Component;
import javax.swing.*;
import java.util.*;
import java.net.URL;

/** Provides JTree icons for different Components. */

class ComponentTreeIcons {
    private Map icons = new HashMap();
    public Icon getIcon(Class cls) {
        String className = cls.getName();
        int lastdot = className.lastIndexOf(".");
        String simpleName = lastdot != -1
            ? className.substring(lastdot+1).toLowerCase() : className;
        Icon icon = (Icon)icons.get(className);
        if (icon == null) {
            URL url = getClass().getResource("icons/" + className + ".gif");
            if (url == null) {
                url = getClass().getResource("icons/" + simpleName + ".gif");
            }
            if (url == null) {
                if (Component.class.equals(cls))
                    return null;
                icon = getIcon(cls.getSuperclass());
            }
            else {
                icon = new ImageIcon(url);
            }
            if (icon != null) {
                icons.put(className, icon);
            }
        }
        return icon;
    }
}