## ✨ Features

### Core Utilities
- **Bean Manipulation** (`org.codelibs.core.beans`) - JavaBeans metadata handling, property access, and object conversion with comprehensive `BeanDesc` system

# CLAUDE.md - AI Assistant Guide for CodeLibs CoreLib

Java 21 utility library. Maven build system, Apache License 2.0.

## Repository Structure

```
src/main/java/org/codelibs/core/
├── beans/       # Bean manipulation & introspection (converter/, factory/, impl/, util/)
├── collection/  # Enhanced collections (LruHashMap, CaseInsensitiveMap)
├── concurrent/  # Concurrency utilities
├── convert/     # Type conversion (*ConversionUtil)

 * for document data. This class wraps an existing map and provides custom behavior
 * for the entrySet method to ensure language fields appear first in iteration order.
 * Used throughout the Fess search system for document data manipulation.
 *
 */
public class DocMap implements Map<String, Object> {

    /** The key used for language field identification */
    private static final String LANG_KEY = "lang";

import org.codelibs.fess.taglib.FessFunctions;
import org.lastaflute.web.util.LaRequestUtil;

import jakarta.servlet.http.HttpServletRequest;

/**
 * Utility class for document data manipulation and type conversion.
 * This class provides static methods for extracting typed values from document maps,
 * URL encoding, and other document-related operations. It's designed as a final
 * utility class with only static methods.

    ImmutableSet<E> toImmutableSet() {
      if (set == null) {
        return ImmutableSet.of();
      }
      ImmutableSet<E> ret = ImmutableEnumSet.asImmutable(set);
      set = null; // subsequent manual manipulation of the accumulator mustn't affect ret
      return ret;
    }
  }

  @GwtIncompatible
  @SuppressWarnings({"rawtypes", "unchecked"})
  static <E extends Comparable<? super E>>

    ImmutableSet<E> toImmutableSet() {
      if (set == null) {
        return ImmutableSet.of();
      }
      ImmutableSet<E> ret = ImmutableEnumSet.asImmutable(set);
      set = null; // subsequent manual manipulation of the accumulator mustn't affect ret
      return ret;
    }
  }

  @GwtIncompatible
  @SuppressWarnings({"rawtypes", "unchecked"})
  static <E extends Comparable<? super E>>

import org.lastaflute.di.core.SingletonLaContainer;
import org.lastaflute.di.core.exception.ComponentNotFoundException;

import jakarta.annotation.PostConstruct;

/**
 * Helper class for document processing and manipulation in the Fess search system.
 * This class provides utilities for processing document content, titles, and digests,
 * handling text normalization, content extraction, and similar document hash encoding/decoding.

import jakarta.servlet.http.HttpServletRequest;

/**
 * Utility class providing static functions for Fess JSP/JSTL expressions and tag libraries.
 * This class contains various helper methods for formatting, parsing, and manipulating data
 * in Fess web templates, including date formatting, localization, file operations, and
 * query parameter handling.
 *
 * @since 1.0
 */
public class FessFunctions {
    /** Logger instance for this class */