Dave Jarvis' Repositories

/*
 * Copyright (c) 2015 Karl Tauber <karl at jformdesigner dot com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.markdownwriterfx.util;

import java.util.ArrayList;
import java.util.Set;
import java.util.prefs.Preferences;
import javafx.geometry.Orientation;
import javafx.scene.Node;
import javafx.scene.control.ScrollBar;

/**
 * @author Karl Tauber
 */
public class Utils
{
	public static boolean safeEquals(Object o1, Object o2) {
		if (o1 == o2)
			return true;
		if (o1 == null || o2 == null)
			return false;
		return o1.equals(o2);
	}

	public static boolean isNullOrEmpty(String s) {
		return s == null || s.isEmpty();
	}

	public static String ltrim(String s) {
		int i = 0;
		while (i < s.length() && Character.isWhitespace(s.charAt(i)))
			i++;
		return s.substring(i);
	}

	public static String rtrim(String s) {
		int i = s.length() - 1;
		while (i >= 0 && Character.isWhitespace(s.charAt(i)))
			i--;
		return s.substring(0, i + 1);
	}

	public static void putPrefs(Preferences prefs, String key, String value, String def) {
		if (value != def && !value.equals(def))
			prefs.put(key, value);
		else
			prefs.remove(key);
	}

	public static void putPrefsInt(Preferences prefs, String key, int value, int def) {
		if (value != def)
			prefs.putInt(key, value);
		else
			prefs.remove(key);
	}

	public static void putPrefsBoolean(Preferences prefs, String key, boolean value, boolean def) {
		if (value != def)
			prefs.putBoolean(key, value);
		else
			prefs.remove(key);
	}

	public static String[] getPrefsStrings(Preferences prefs, String key) {
		ArrayList<String> arr = new ArrayList<String>();
		for (int i = 0; i < 10000; i++) {
			String s = prefs.get(key + (i + 1), null);
			if (s == null)
				break;
			arr.add(s);
		}
		return arr.toArray(new String[arr.size()]);
	}

	public static void putPrefsStrings(Preferences prefs, String key, String[] strings) {
		for (int i = 0; i < strings.length; i++)
			prefs.put(key + (i + 1), strings[i]);

		for (int i = strings.length; prefs.get(key + (i + 1), null) != null; i++)
			prefs.remove(key + (i + 1));
	}

	public static ScrollBar findVScrollBar(Node node) {
		Set<Node> scrollBars = node.lookupAll(".scroll-bar");
		for (Node scrollBar : scrollBars) {
			if (scrollBar instanceof ScrollBar &&
				((ScrollBar)scrollBar).getOrientation() == Orientation.VERTICAL)
			  return (ScrollBar) scrollBar;
		}
		return null;
	}
}