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Merge pull request #79 from sclassen/removeGuavaDependency
Remove guava dependency
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61 changes: 61 additions & 0 deletions
61
preferencesfx/src/main/java/com/dlsc/preferencesfx/util/Strings.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package com.dlsc.preferencesfx.util; | ||
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| import static java.util.Objects.requireNonNull; | ||
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| import java.nio.charset.StandardCharsets; | ||
| import java.security.MessageDigest; | ||
| import java.security.NoSuchAlgorithmException; | ||
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| /** | ||
| * Helper methods for working with strings. | ||
| */ | ||
| public class Strings { | ||
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| private static final char[] HEX_ARRAY = "0123456789abcdef".toCharArray(); | ||
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| /** | ||
| * Checks if a string is null or empty. | ||
| * | ||
| * @param string the string to test, may be {@code null}. | ||
| * @return {@code true} iff the string is not null and not empty | ||
| */ | ||
| public static boolean isNullOrEmpty(String string) { | ||
| return string == null || string.isEmpty(); | ||
| } | ||
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| /** | ||
| * Calculates the SHA-256 digest of a string. | ||
| * | ||
| * @param string the string to digest, must not be {@code null}. | ||
| * @return the SHA-256 digest of the input string | ||
| */ | ||
| public static String sha256(String string) { | ||
| requireNonNull(string); | ||
| try { | ||
| final MessageDigest digest = MessageDigest.getInstance("sha-256"); | ||
| final byte[] hash = digest.digest(string.getBytes(StandardCharsets.UTF_8)); | ||
| return hexString(hash); | ||
| } catch (NoSuchAlgorithmException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| /** | ||
| * Calculates the HEX representation of a byte array. | ||
| * | ||
| * @param bytes the byte array, must not be {@code null}. | ||
| * @return the HEX representation of the byte array. | ||
| */ | ||
| public static String hexString(byte[] bytes) { | ||
| requireNonNull(bytes); | ||
| final int numBytes = bytes.length; | ||
| char[] hexChars = new char[numBytes * 2]; | ||
| for (int i = 0; i < numBytes; i++) { | ||
| int v = bytes[i] & 0xFF; | ||
| hexChars[i * 2] = HEX_ARRAY[v >>> 4]; | ||
| hexChars[(i * 2) + 1] = HEX_ARRAY[v & 0x0F]; | ||
| } | ||
| return new String(hexChars); | ||
| } | ||
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| } |
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