public List<Character> create(Character[] elements) {
      char[] chars = Chars.toArray(asList(elements));
      return charactersOf(String.copyValueOf(chars));
    }
  }

  public static class CharactersOfCharSequenceGenerator extends TestCharacterListGenerator {
    @Override
    public List<Character> create(Character[] elements) {
      char[] chars = Chars.toArray(asList(elements));

    public List<Character> create(Character[] elements) {
      char[] chars = Chars.toArray(asList(elements));
      return charactersOf(String.copyValueOf(chars));
    }
  }

  public static class CharactersOfCharSequenceGenerator extends TestCharacterListGenerator {
    @Override
    public List<Character> create(Character[] elements) {
      char[] chars = Chars.toArray(asList(elements));

    }

    private static final String[] LLM_LOG_PACKAGES =
            { "org.codelibs.fess.llm", "org.codelibs.fess.chat", "org.codelibs.fess.api.chat", "org.codelibs.fess.app.web.chat" };

    /**
     * Sets the log level for LLM-related packages.
     *
     * @param level the log level to set
     */
    public void setLlmLogLevel(final String level) {

rag.chat.session.timeout.minutes=30
rag.chat.session.max.size=10000
rag.chat.history.max.messages=30

# Enhanced RAG flow settings.
# Fields to retrieve for full document content.
rag.chat.content.fields=title,url,content,doc_id,content_title,content_description
rag.chat.message.max.length=4000
# Highlight settings for RAG search.
rag.chat.highlight.fragment.size=500
rag.chat.highlight.number.of.fragments=3

    default char[] getQueryHighlightBoundaryCharsAsArray() {
        final int[] values = getCrawlerDocumentCharsAsArray(QUERY_HIGHLIGHT_BOUNDARY_CHARS, getQueryHighlightBoundaryChars());
        final char[] chars = new char[values.length];
        for (int i = 0; i < values.length; i++) {
            chars[i] = (char) values[i];
        }
        return chars;
    }

/**
 * API Manager for RAG chat endpoints with SSE streaming support.
 *
 * @author FessProject
 */
public class ChatApiManager extends BaseApiManager {

    private static final Logger logger = LogManager.getLogger(ChatApiManager.class);

    private static final String CHAT_API_PATH = "/api/v1/chat";
    private static final String STREAM_API_PATH = "/api/v1/chat/stream";

      if (isNullOrEmpty(value)) {
        throw new IllegalArgumentException("value of key " + key + " omitted");
      }
      try {
        char lastChar = value.charAt(value.length() - 1);
        TimeUnit timeUnit;
        switch (lastChar) {
          case 'd':
            timeUnit = DAYS;
            break;
          case 'h':
            timeUnit = HOURS;

      if (isNullOrEmpty(value)) {
        throw new IllegalArgumentException("value of key " + key + " omitted");
      }
      try {
        char lastChar = value.charAt(value.length() - 1);
        TimeUnit timeUnit;
        switch (lastChar) {
          case 'd':
            timeUnit = DAYS;
            break;
          case 'h':
            timeUnit = HOURS;

    /** The key of the configuration. e.g. false */
    String RAG_CHAT_ENABLED = "rag.chat.enabled";

    /** The key of the configuration. e.g. 5 */
    String RAG_CHAT_CONTEXT_MAX_DOCUMENTS = "rag.chat.context.max.documents";

    /** The key of the configuration. e.g. 30 */
    String RAG_CHAT_SESSION_TIMEOUT_MINUTES = "rag.chat.session.timeout.minutes";

			<AppenderRef ref="LlmFile" />
		</Logger>
		<Logger name="org.codelibs.fess.chat" additivity="false" level="${llm.log.level}">
			<AppenderRef ref="LlmFile" />
		</Logger>
		<Logger name="org.codelibs.fess.api.chat" additivity="false" level="${llm.log.level}">
			<AppenderRef ref="LlmFile" />
		</Logger>
		<Logger name="org.codelibs.fess.app.web.chat" additivity="false" level="${llm.log.level}">
			<AppenderRef ref="LlmFile" />