afv-library/skills/apex-development/apex-class/templates/utility.cls

/**
 * @description Utility class for {describe the category of utilities: String, Date, Collection, etc.}.
 *              All methods are static and side-effect-free (no SOQL, no DML).
 *              Private constructor prevents instantiation.
 * @author Generated by Apex Class Writer Skill
 */
public with sharing class {ClassName} {

    // ─── Private Constructor ─────────────────────────────────────────────

    /**
     * @description Prevents instantiation — use static methods only
     */
    @TestVisible
    private {ClassName}() {
        // Utility class — do not instantiate
    }

    // ─── Public Methods ──────────────────────────────────────────────────

    // TODO: Add utility methods below. Examples:

    /**
     * @description Safely converts a String to an Integer, returning a default if parsing fails
     * @param value The String to parse
     * @param defaultValue The fallback value if parsing fails
     * @return The parsed Integer or the default value
     * @example
     * Integer result = {ClassName}.safeParseInteger('42', 0); // returns 42
     * Integer result = {ClassName}.safeParseInteger('abc', 0); // returns 0
     */
    public static Integer safeParseInteger(String value, Integer defaultValue) {
        if (String.isBlank(value)) {
            return defaultValue;
        }
        try {
            return Integer.valueOf(value.trim());
        } catch (TypeException e) {
            return defaultValue;
        }
    }

    /**
     * @description Chunks a list into smaller sublists of the specified size.
     *              Useful for processing records in governor-limit-safe batches.
     * @param items The list to chunk
     * @param chunkSize The maximum size of each chunk
     * @return A list of sublists, each containing up to chunkSize elements
     * @example
     * List<List<String>> chunks = {ClassName}.chunkList(myList, 200);
     */
    public static List<List<Object>> chunkList(List<Object> items, Integer chunkSize) {
        List<List<Object>> chunks = new List<List<Object>>();
        if (items == null || items.isEmpty() || chunkSize <= 0) {
            return chunks;
        }

        List<Object> currentChunk = new List<Object>();
        for (Object item : items) {
            currentChunk.add(item);
            if (currentChunk.size() == chunkSize) {
                chunks.add(currentChunk);
                currentChunk = new List<Object>();
            }
        }

        if (!currentChunk.isEmpty()) {
            chunks.add(currentChunk);
        }

        return chunks;
    }

    /**
     * @description Extracts a Set of non-null field values from a list of SObjects
     * @param records The SObject records to extract from
     * @param fieldName The API name of the field to extract
     * @return A Set of non-null String values
     * @example
     * Set<String> emails = {ClassName}.pluckStrings(contacts, 'Email');
     */
    public static Set<String> pluckStrings(List<SObject> records, String fieldName) {
        Set<String> values = new Set<String>();
        if (records == null || String.isBlank(fieldName)) {
            return values;
        }

        for (SObject record : records) {
            Object val = record.get(fieldName);
            if (val != null) {
                values.add(String.valueOf(val));
            }
        }

        return values;
    }
}