Utilities

import net.sf.cglib.util.StringSwitcher;
import net.sf.cglib.util.ParallelSorter;
import net.sf.cglib.util.SorterTemplate;
import net.sf.cglib.util.KeyFactory;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Map;

/**
 * Efficient string-based switch statement implementation
 */
public abstract class StringSwitcher {
    /**
     * Create StringSwitcher for given strings and corresponding integer values
     * @param strings - Array of strings to match
     * @param ints - Array of integers corresponding to each string
     * @param fixedInput - Whether input strings are guaranteed to be from the strings array
     * @return StringSwitcher instance
     */
    public static StringSwitcher create(String[] strings, int[] ints, boolean fixedInput);
    
    /**
     * Get integer value for given string
     * @param s - String to lookup
     * @return Corresponding integer value, or -1 if not found
     */
    public abstract int intValue(String s);
}

import net.sf.cglib.util.StringSwitcher;

// Create string switcher for HTTP methods
String[] methods = {"GET", "POST", "PUT", "DELETE", "PATCH"};
int[] values = {1, 2, 3, 4, 5};

StringSwitcher switcher = StringSwitcher.create(methods, values, false);

// Use in switch-like logic (much faster than string comparison chains)
String httpMethod = "POST";
int methodCode = switcher.intValue(httpMethod); // Returns 2

switch (methodCode) {
    case 1:
        System.out.println("Handle GET request");
        break;
    case 2:
        System.out.println("Handle POST request");
        break;
    case 3:
        System.out.println("Handle PUT request");
        break;
    case 4:
        System.out.println("Handle DELETE request");
        break;
    case 5:
        System.out.println("Handle PATCH request");
        break;
    default:
        System.out.println("Unknown method");
}

// Fixed input version (slightly more optimized when input is guaranteed to be from the array)
StringSwitcher fixedSwitcher = StringSwitcher.create(methods, values, true);

/**
 * Sorts multiple arrays in parallel based on one array's values
 */
public class ParallelSorter {
    /**
     * Sort two arrays in parallel based on first array's order
     * @param a - Primary array to sort by
     * @param b - Secondary array to rearrange in parallel
     */
    public static void sort(Object[] a, Object[] b);
    
    /**
     * Sort multiple arrays in parallel based on first array's order
     * @param arrays - Arrays to sort, first array determines sort order
     */
    public static void sort(Object[][] arrays);
    
    /**
     * Sort with custom comparator
     * @param a - Primary array to sort by
     * @param b - Secondary array to rearrange in parallel  
     * @param cmp - Comparator for primary array
     */
    public static void sort(Object[] a, Object[] b, Comparator cmp);
    
    /**
     * Sort multiple arrays with custom comparator
     * @param arrays - Arrays to sort, first array determines sort order
     * @param cmp - Comparator for primary array
     */
    public static void sort(Object[][] arrays, Comparator cmp);
}

import net.sf.cglib.util.ParallelSorter;
import java.util.Arrays;

// Sort students by age while keeping names in sync
String[] names = {"Alice", "Bob", "Charlie", "Diana"};
Integer[] ages = {25, 19, 30, 22};

// Sort by ages (primary array), names will be rearranged to match
ParallelSorter.sort(ages, names);

// Result: ages = [19, 22, 25, 30], names = ["Bob", "Diana", "Alice", "Charlie"]
System.out.println("Sorted ages: " + Arrays.toString(ages));
System.out.println("Corresponding names: " + Arrays.toString(names));

// Multiple arrays example
String[] firstNames = {"John", "Jane", "Bob", "Alice"};
String[] lastNames = {"Doe", "Smith", "Johnson", "Wilson"};  
Integer[] scores = {85, 92, 78, 95};

// Sort by scores, keeping first and last names in sync
Object[][] data = {scores, firstNames, lastNames};
ParallelSorter.sort(data);

// With custom comparator (reverse order)
ParallelSorter.sort(ages, names, (a, b) -> ((Integer)b).compareTo((Integer)a));

/**
 * Abstract template for custom parallel sorting algorithms
 */
public abstract class SorterTemplate {
    /**
     * Perform the sorting operation
     * @param from - Start index (inclusive)
     * @param to - End index (exclusive)
     */
    public final void quickSort(int from, int to);
    
    /**
     * Merge sort implementation
     * @param from - Start index (inclusive) 
     * @param to - End index (exclusive)
     */
    public final void mergeSort(int from, int to);
    
    /**
     * Compare elements at two indices
     * @param i - First index
     * @param j - Second index
     * @return Negative if i < j, zero if i == j, positive if i > j
     */
    protected abstract int compare(int i, int j);
    
    /**
     * Swap elements at two indices
     * @param i - First index
     * @param j - Second index
     */
    protected abstract void swap(int i, int j);
    
    /**
     * Get length of data to sort
     * @return Data length
     */
    protected abstract int length();
}

/**
 * Generates efficient key objects for caching and hash operations
 */
public abstract class KeyFactory {
    /**
     * Create KeyFactory for given interface
     * @param keyInterface - Interface defining key methods
     * @return KeyFactory instance
     */
    public static KeyFactory create(Class keyInterface);
    
    /**
     * Create KeyFactory with custom ClassLoader
     * @param loader - ClassLoader to use
     * @param keyInterface - Interface defining key methods
     * @return KeyFactory instance
     */
    public static KeyFactory create(ClassLoader loader, Class keyInterface);
    
    /**
     * Create new key instance
     * @return Key object implementing the key interface
     */
    public abstract Object newInstance();
}

import net.sf.cglib.util.KeyFactory;

// Define key interface
interface CacheKey {
    void setUserId(int userId);
    void setTimestamp(long timestamp);
    void setType(String type);
}

// Create key factory
KeyFactory factory = KeyFactory.create(CacheKey.class);

// Create efficient key objects for caching
CacheKey key1 = (CacheKey) factory.newInstance();
key1.setUserId(123);
key1.setTimestamp(System.currentTimeMillis());
key1.setType("user-profile");

CacheKey key2 = (CacheKey) factory.newInstance();
key2.setUserId(456);
key2.setTimestamp(System.currentTimeMillis());
key2.setType("user-settings");

// Keys properly implement equals() and hashCode() for efficient caching
Map<Object, Object> cache = new HashMap<>();
cache.put(key1, "profile data");
cache.put(key2, "settings data");