125 lines
3.3 KiB
Java
125 lines
3.3 KiB
Java
package de.nclazz.commons;
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import lombok.NonNull;
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import lombok.SneakyThrows;
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import java.security.MessageDigest;
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public abstract class StringUtils {
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private StringUtils() { /* no-op */ }
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/**
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* Checks if a String is null or does not contain a character
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* other than whitespace.
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*
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* @param s String to check
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* @return {@code true} if String is empty
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*/
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public static boolean isEmpty(String s) {
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if(s == null) {
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return true;
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}
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if(s.isEmpty()) {
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return true;
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}
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for(int i = 0; i < s.length(); i++) {
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if(!Character.isWhitespace(s.charAt(i))) {
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return false;
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}
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}
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return true;
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}
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/**
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* Capitalizes a String, meaning only the first letter becomes an
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* upper case letter if not already.
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* <p>i.e. {@code fooBar} -> {@code FooBar}</p>
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* @param s String to capitalize
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* @return capitalized String
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* @see #decapitalize(String)
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*/
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public static String capitalize(String s) {
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if(s != null) {
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s = s.substring(0, 1).toUpperCase() + s.substring(1);
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}
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return s;
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}
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/**
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* Decapitalizes a String, meaning only the first letter becomes a
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*lower case letter if not already.
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* <p>i.e. {@code FooBar} -> {@code fooBar}</p>
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* @param s String to decapitalize
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* @return decapitalized String
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* @see #capitalize(String)
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*/
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public static String decapitalize(String s) {
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if(s != null) {
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s = s.substring(0, 1).toLowerCase() + s.substring(1);
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}
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return s;
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}
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public static String center(String s, int size) {
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return center(s, size, ' ');
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}
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public static String center(String s, int size, char pad) {
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if (s == null || size <= s.length())
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return s;
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StringBuilder sb = new StringBuilder(size);
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for (int i = 0; i < (size - s.length()) / 2; i++) {
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sb.append(pad);
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}
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sb.append(s);
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while (sb.length() < size) {
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sb.append(pad);
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}
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return sb.toString();
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}
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/**
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* Create a hex-{@code String} from given byte array,
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* @param bytes array
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* @return new {@code String}
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* @throws NullPointerException if bytes are {@code null}
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*/
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public static String toHex(@NonNull byte[] bytes) {
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StringBuilder sb = new StringBuilder(bytes.length*2);
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for (int v : bytes) {
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sb.append(Character.forDigit((v >> 4) & 0xF, 16))
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.append(Character.forDigit((v & 0xF), 16));
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}
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return sb.toString();
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}
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/**
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* Hashes given String with given hash algorithm
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*
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* @param input to hash
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* @param md hash algorithm
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* @return hash (hex-)String
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*/
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@SneakyThrows
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public static String digestString(@NonNull String input, MessageDigest md) {
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md.update(input.getBytes());
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String hash = toHex(md.digest());
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return hash;
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}
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@SneakyThrows
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public static String toSHA1(String input) {
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return digestString(input, MessageDigest.getInstance("SHA-1"));
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}
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@SneakyThrows
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public static String toMD(String input) {
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return digestString(input, MessageDigest.getInstance("MD5"));
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}
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}
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