franta-hg@16: /**
franta-hg@16:  * SQL-DK
franta-hg@16:  * Copyright © 2013 František Kučera (frantovo.cz)
franta-hg@16:  *
franta-hg@16:  * This program is free software: you can redistribute it and/or modify
franta-hg@16:  * it under the terms of the GNU General Public License as published by
franta-hg@16:  * the Free Software Foundation, either version 3 of the License, or
franta-hg@16:  * (at your option) any later version.
franta-hg@16:  *
franta-hg@16:  * This program is distributed in the hope that it will be useful,
franta-hg@16:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
franta-hg@16:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
franta-hg@16:  * GNU General Public License for more details.
franta-hg@16:  *
franta-hg@16:  * You should have received a copy of the GNU General Public License
franta-hg@16:  * along with this program. If not, see <http://www.gnu.org/licenses/>.
franta-hg@16:  */
franta-hg@1: package info.globalcode.sql.dk;
franta-hg@1: 
franta-hg@29: import info.globalcode.sql.dk.configuration.NameIdentified;
franta-hg@33: import java.io.BufferedReader;
franta-hg@33: import java.io.File;
franta-hg@33: import java.io.IOException;
franta-hg@33: import java.io.InputStreamReader;
franta-hg@33: import java.io.PrintWriter;
franta-hg@1: import java.util.ArrayList;
franta-hg@40: import java.util.Arrays;
franta-hg@1: import java.util.Collection;
franta-hg@1: import java.util.Map;
franta-hg@1: 
franta-hg@1: /**
franta-hg@1:  *
franta-hg@1:  * @author Ing. František Kučera (frantovo.cz)
franta-hg@1:  */
franta-hg@1: public class Functions {
franta-hg@1: 
franta-hg@1: 	private Functions() {
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public static boolean equalz(Object a, Object b) {
franta-hg@1: 		return a == null ? b == null : a.equals(b);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	 *
franta-hg@1: 	 * @param text String to be examinated
franta-hg@1: 	 * @param trim whether text should be trimmed before examination
franta-hg@1: 	 * @return whether text is not empty and one or more characters long (after prospective trim)
franta-hg@1: 	 */
franta-hg@1: 	public static boolean isEmpty(String text, boolean trim) {
franta-hg@1: 		if (text == null) {
franta-hg@1: 			return true;
franta-hg@1: 		} else {
franta-hg@1: 			if (trim) {
franta-hg@1: 				text = text.trim();
franta-hg@1: 			}
franta-hg@1: 			return text.isEmpty();
franta-hg@1: 		}
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	 * @see #isEmpty(java.lang.String, boolean)
franta-hg@1: 	 */
franta-hg@1: 	public static boolean isNotEmpty(String text, boolean trim) {
franta-hg@1: 		return !isEmpty(text, trim);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isEmpty(Collection c) {
franta-hg@1: 		return c == null || c.isEmpty();
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isNotEmpty(Collection c) {
franta-hg@1: 		return !isEmpty(c);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isEmpty(Map m) {
franta-hg@1: 		return m == null || m.isEmpty();
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isNotEmpty(Map m) {
franta-hg@1: 		return !isEmpty(m);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	 * @return empty collection if given one is null | or the original one
franta-hg@1: 	 */
franta-hg@1: 	public static <T> Collection<T> notNull(Collection<T> c) {
franta-hg@1: 		if (c == null) {
franta-hg@1: 			return new ArrayList<>();
franta-hg@1: 		} else {
franta-hg@1: 			return c;
franta-hg@1: 		}
franta-hg@1: 	}
franta-hg@29: 
franta-hg@29: 	public static <T extends NameIdentified> T findByName(Collection<T> collection, String name) {
franta-hg@29: 		for (T element : collection) {
franta-hg@54: 			if (element != null && equalz(element.getName(), name)) {
franta-hg@29: 				return element;
franta-hg@29: 			}
franta-hg@29: 		}
franta-hg@29: 
franta-hg@29: 		return null;
franta-hg@29: 	}
franta-hg@33: 
franta-hg@33: 	/**
franta-hg@33: 	 * Copy file from Java resources to file system.
franta-hg@33: 	 */
franta-hg@33: 	public static void installResource(String resourceName, File target) throws IOException {
franta-hg@33: 		try (BufferedReader reader = new BufferedReader(new InputStreamReader(Functions.class.getClassLoader().getResourceAsStream(resourceName)))) {
franta-hg@33: 			try (PrintWriter writer = new PrintWriter(target)) {
franta-hg@33: 				while (true) {
franta-hg@33: 					String line = reader.readLine();
franta-hg@33: 					if (line == null) {
franta-hg@33: 						break;
franta-hg@33: 					} else {
franta-hg@33: 						writer.println(line);
franta-hg@33: 					}
franta-hg@33: 				}
franta-hg@33: 			}
franta-hg@33: 		}
franta-hg@33: 	}
franta-hg@38: 
franta-hg@38: 	public static String rpad(String s, int n) {
franta-hg@88: 		if (n > 0) {
franta-hg@88: 			return String.format("%1$-" + n + "s", s);
franta-hg@88: 		} else {
franta-hg@88: 			return s;
franta-hg@88: 		}
franta-hg@38: 	}
franta-hg@38: 
franta-hg@38: 	public static String lpad(String s, int n) {
franta-hg@88: 		if (n > 0) {
franta-hg@88: 			return String.format("%1$" + n + "s", s);
franta-hg@88: 		} else {
franta-hg@88: 			return s;
franta-hg@88: 		}
franta-hg@38: 	}
franta-hg@40: 
franta-hg@40: 	public static String repeat(char ch, int count) {
franta-hg@40: 		char[] array = new char[count];
franta-hg@40: 		Arrays.fill(array, ch);
franta-hg@40: 		return new String(array);
franta-hg@40: 	}
franta-hg@1: }