Bip39UiMessages.java

package com.example.bip39.integration;

import com.example.bip39.error.Bip39ErrorCode;
import java.util.EnumMap;
import java.util.Map;
import java.util.Objects;

public final class Bip39UiMessages {

  private static final Map<Bip39ErrorCode, String> UI_MESSAGES = createUiMessages();

  private Bip39UiMessages() {}

  public static String messageFor(Bip39ErrorCode errorCode) {
    Objects.requireNonNull(errorCode, "errorCode must not be null");
    return UI_MESSAGES.get(errorCode);
  }

  private static Map<Bip39ErrorCode, String> createUiMessages() {
    EnumMap<Bip39ErrorCode, String> messages = new EnumMap<>(Bip39ErrorCode.class);
    messages.put(
        Bip39ErrorCode.ERR_ENTROPY_LENGTH, "Entropy length must be 16, 20, 24, 28, or 32 bytes.");
    messages.put(
        Bip39ErrorCode.ERR_INVALID_MNEMONIC_FORMAT, "Enter words in normalized lowercase form.");
    messages.put(
        Bip39ErrorCode.ERR_INVALID_WORD_COUNT,
        "Mnemonic word count must be 12, 15, 18, 21, or 24.");
    messages.put(
        Bip39ErrorCode.ERR_WORD_NOT_IN_LIST,
        "Mnemonic contains a word outside the English BIP39 list.");
    messages.put(
        Bip39ErrorCode.ERR_CHECKSUM_MISMATCH,
        "Mnemonic checksum does not match the words provided.");
    messages.put(
        Bip39ErrorCode.ERR_PBKDF2_FAILURE, "Seed derivation is unavailable in this runtime.");
    return Map.copyOf(messages);
  }
}