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Add configurable hash mod base #75

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Add configurable hash mod base #75

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2 changes: 1 addition & 1 deletion pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -198,7 +198,7 @@
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
<version>4.13.2</version>
<scope>test</scope>
</dependency>
</dependencies>
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15 changes: 13 additions & 2 deletions src/main/java/org/hashids/Hashids.java
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Original file line number Diff line number Diff line change
Expand Up @@ -31,12 +31,14 @@ public class Hashids {
private static final int MIN_ALPHABET_LENGTH = 16;
private static final double SEP_DIV = 3.5;
private static final int GUARD_DIV = 12;
private static final int DEFAULT_HASH_MOD_BASE = 100;

private final String salt;
private final int minHashLength;
private final String alphabet;
private final String seps;
private final String guards;
private final int hashModBase;

public Hashids() {
this(DEFAULT_SALT);
Expand All @@ -47,12 +49,21 @@ public Hashids(String salt) {
}

public Hashids(String salt, int minHashLength) {
this(salt, minHashLength, DEFAULT_ALPHABET);
this(salt, minHashLength, DEFAULT_ALPHABET, DEFAULT_HASH_MOD_BASE);
}

public Hashids(String salt, int minHashLength, int hashModBase) {
this(salt, minHashLength, DEFAULT_ALPHABET, hashModBase);
}

public Hashids(String salt, int minHashLength, String alphabet) {
this(salt, minHashLength, alphabet, DEFAULT_HASH_MOD_BASE);
}

public Hashids(String salt, int minHashLength, String alphabet, int hashModBase) {
this.salt = salt != null ? salt : DEFAULT_SALT;
this.minHashLength = minHashLength > 0 ? minHashLength : DEFAULT_MIN_HASH_LENGTH;
this.hashModBase = hashModBase != 0? hashModBase : DEFAULT_HASH_MOD_BASE;

final StringBuilder uniqueAlphabet = new StringBuilder();
for (int i = 0; i < alphabet.length(); i++) {
Expand Down Expand Up @@ -226,7 +237,7 @@ public static int checkedCast(long value) {
private String _encode(long... numbers) {
long numberHashInt = 0;
for (int i = 0; i < numbers.length; i++) {
numberHashInt += (numbers[i] % (i + 100));
numberHashInt += (numbers[i] % (i + hashModBase));
}
String alphabet = this.alphabet;
final char ret = alphabet.charAt((int) (numberHashInt % alphabet.length()));
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