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/**
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* SQL-DK
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* Copyright © 2013 František Kučera (frantovo.cz)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package info.globalcode.sql.dk;
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import info.globalcode.sql.dk.configuration.NameIdentified;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Map;
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/**
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*
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* @author Ing. František Kučera (frantovo.cz)
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*/
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public class Functions {
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private Functions() {
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}
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public static boolean equalz(Object a, Object b) {
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return a == null ? b == null : a.equals(b);
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}
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/**
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*
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* @param text String to be examinated
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* @param trim whether text should be trimmed before examination
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* @return whether text is not empty and one or more characters long (after prospective trim)
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*/
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public static boolean isEmpty(String text, boolean trim) {
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if (text == null) {
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return true;
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} else {
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if (trim) {
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text = text.trim();
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}
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return text.isEmpty();
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}
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}
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/**
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* @see #isEmpty(java.lang.String, boolean)
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*/
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public static boolean isNotEmpty(String text, boolean trim) {
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return !isEmpty(text, trim);
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}
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public boolean isEmpty(Collection c) {
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return c == null || c.isEmpty();
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}
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public boolean isNotEmpty(Collection c) {
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return !isEmpty(c);
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}
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public boolean isEmpty(Map m) {
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return m == null || m.isEmpty();
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}
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public boolean isNotEmpty(Map m) {
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return !isEmpty(m);
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}
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/**
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* @return empty collection if given one is null | or the original one
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*/
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public static <T> Collection<T> notNull(Collection<T> c) {
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if (c == null) {
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return Collections.emptyList();
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} else {
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return c;
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}
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}
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public static <T extends NameIdentified> T findByName(Collection<T> collection, String name) {
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for (T element : notNull(collection)) {
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if (element != null && equalz(element.getName(), name)) {
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return element;
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}
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}
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return null;
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}
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/**
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* Copy file from Java resources to file system.
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*/
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public static void installResource(String resourceName, File target) throws IOException {
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try (BufferedReader reader = new BufferedReader(new InputStreamReader(Functions.class.getClassLoader().getResourceAsStream(resourceName)))) {
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try (PrintWriter writer = new PrintWriter(target)) {
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while (true) {
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String line = reader.readLine();
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if (line == null) {
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break;
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} else {
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writer.println(line);
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}
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}
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}
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}
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}
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public static String rpad(String s, int n) {
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if (n > 0) {
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return String.format("%1$-" + n + "s", s);
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} else {
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return s;
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}
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}
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public static String lpad(String s, int n) {
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if (n > 0) {
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return String.format("%1$" + n + "s", s);
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} else {
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return s;
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}
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}
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public static String repeat(char ch, int count) {
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char[] array = new char[count];
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Arrays.fill(array, ch);
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return new String(array);
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}
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private final static char[] HEX_ALPHABET = "0123456789abcdef".toCharArray();
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public static String toHex(byte[] bytes) {
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char[] hexChars = new char[bytes.length * 2];
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for (int j = 0; j < bytes.length; j++) {
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int v = bytes[j] & 0xFF;
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hexChars[j * 2] = HEX_ALPHABET[v >>> 4];
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hexChars[j * 2 + 1] = HEX_ALPHABET[v & 0x0F];
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}
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return new String(hexChars);
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}
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}
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