Olive

Olive

Overview

Olive is a productivity framework for .NET developed by Geeks Ltd. It provides a comprehensive set of extension methods and utility classes that reduce boilerplate in business application development. The framework covers string manipulation, collection operations, date/time helpers, validation utilities, file handling, and more.

Olive's philosophy is to make common operations fluent and null-safe through extension methods. Instead of writing defensive null checks and multi-line utility methods, Olive provides concise, chainable operations that handle edge cases like null or empty inputs gracefully.

Install via NuGet:

dotnet add package Olive

String Extensions

Olive provides null-safe string operations that eliminate defensive coding patterns.

using Olive;

// Null-safe operations
string? nullStr = null;
string result = nullStr.OrEmpty();                // ""
string trimmed = nullStr.TrimOrNull();            // null
string defaulted = nullStr.Or("default");         // "default"

// String validation
bool isEmail = "user@example.com".IsValidEmail(); // true
bool isUrl = "https://example.com".IsValidUrl();  // true
bool hasValue = "hello".HasValue();               // true
bool isEmpty = "".IsEmpty();                      // true

// Transformations
string safe = "my file (1).txt".ToSafeFileName(); // sanitized for filesystem
string pascal = "hello world".ToPascalCase();      // "HelloWorld"
string camel = "hello world".ToCamelCase();        // "helloWorld"

// Truncation and wrapping
string truncated = "A very long string that needs truncating".Summarize(20);
string wrapped = "content".WithWrappers("<b>", "</b>"); // "<b>content</b>"

// Contains and comparison
bool contains = "Hello World".Contains("world", caseSensitive: false); // true
string removed = "Hello World".Remove("World");   // "Hello "
string replaced = "foo-bar-baz".RemoveFrom("-");   // "foo"

Collection Extensions

Fluent collection operations with null safety and LINQ enhancements.

using System;
using System.Collections.Generic;
using System.Linq;
using Olive;

var items = new List<string> { "apple", "banana", "cherry", "date" };

// Null-safe enumeration
List<string>? nullList = null;
var safe = nullList.OrEmpty(); // returns empty enumerable, not null

// Fluent operations
string joined = items.ToString(", ");             // "apple, banana, cherry, date"
bool hasAny = items.HasAny();                     // true
bool none = items.None();                         // false

// Batch processing
var batches = items.ChunkBy(2); // [[apple, banana], [cherry, date]]

// Distinct by selector
var people = new[]
{
    new { Name = "Alice", Dept = "IT" },
    new { Name = "Bob", Dept = "IT" },
    new { Name = "Carol", Dept = "HR" }
};
var distinctByDept = people.DistinctBy(p => p.Dept);

// Add/remove fluently
var extended = items.Concat("elderberry").ToList();
var without = items.Except("banana").ToList();

// Safe indexing
var firstOrNull = items.FirstOrDefault();

Date and Time Helpers

Simplified date arithmetic and formatting extensions.

using System;
using Olive;

var now = DateTime.Now;

// Relative dates
var tomorrow = now.AddDays(1);
var nextWeek = now.AddDays(7);

// Fluent date construction
var specificDate = 15.June(2025);   // June 15, 2025
var christmas = 25.December(2025);

// Time rounding
var rounded = now.RoundToNearest(TimeSpan.FromMinutes(15));

// Date checks
bool isWeekend = now.IsWeekend();
bool isWeekday = now.IsWeekday();
bool isToday = specificDate.IsToday();

// Range operations
bool isBetween = now.IsBetween(
    new DateTime(2025, 1, 1),
    new DateTime(2025, 12, 31));

// Formatting
string relative = tomorrow.ToTimeDifferenceString(); // "tomorrow"
string friendly = now.ToFriendlyDateString();

Type Conversion Extensions

Safe type conversion utilities that handle parsing with fallbacks.

using Olive;

// Safe parsing with defaults
int number = "42".To<int>();              // 42
int fallback = "not-a-number".To<int>();  // 0 (default)
double price = "19.99".To<double>();      // 19.99

// Nullable parsing
int? nullable = "42".ToIntOrNull();       // 42
int? nullResult = "abc".ToIntOrNull();    // null
double? dbl = "3.14".ToDoubleOrNull();    // 3.14

// Boolean parsing
bool yes = "yes".ToBoolean();             // true
bool               // true
bool trueStr = "true".ToBoolean();        // true

// Enum parsing
var status = "Active".To<Status>();

public enum Status { Active, Inactive, Pending }

IO and File Utilities

File system operations with safety and convenience methods.

using System.IO;
using Olive;

// Safe file name generation
string safeName = "Report (Q1/2025).pdf".ToSafeFileName();
// Removes or replaces invalid characters

// File extension checking
bool isPdf = "document.pdf".HasExtension(".pdf"); // true
string noExt = "document.pdf".TrimEnd(".pdf");

// Directory operations
var tempDir = Path.GetTempPath();
var appDir = Path.Combine(tempDir, "MyApp");

// Ensure directory exists
Directory.CreateDirectory(appDir);

// Path combination (null-safe)
string fullPath = new[] { tempDir, "MyApp", "data", "file.json" }
    .Where(p => p.HasValue())
    .Aggregate(Path.Combine);

Building Services with Olive Extensions

Integrate Olive utilities into service classes for cleaner business logic.

using System;
using System.Collections.Generic;
using System.Linq;
using Olive;

public class CustomerService
{
    public IReadOnlyList<Customer> Search(string? query, string? department)
    {
        var customers = GetAllCustomers();

        return customers
            .Where(c => query.IsEmpty() || c.Name.Contains(query, caseSensitive: false))
            .Where(c => department.IsEmpty() || c.Department.OrEmpty() == department)
            .OrderBy(c => c.Name)
            .ToList();
    }

    public string FormatCustomerSummary(Customer customer)
    {
        var parts = new[]
        {
            customer.Name,
            customer.Email.HasValue() ? $"({customer.Email})" : null,
            customer.Department.Or("Unassigned")
        };

        return parts.Where(p => p.HasValue()).ToString(" ");
    }

    public ValidationResult Validate(CustomerInput input)
    {
        var errors = new List<string>();

        if (input.Name.IsEmpty())
            errors.Add("Name is required");

        if (input.Email.HasValue() && !input.Email.IsValidEmail())
            errors.Add("Invalid email format");

        return new ValidationResult(errors.None(), errors);
    }

    private IEnumerable<Customer> GetAllCustomers() => Enumerable.Empty<Customer>();
}

public record Customer(string Name, string? Email, string? Department);
public record CustomerInput(string? Name, string? Email);
public record ValidationResult(bool IsValid, IReadOnlyList<string> Errors);

Olive vs Standard .NET

Best Practices

1. Use OrEmpty() and Or("default") at API boundaries to convert nullable strings into safe values immediately, eliminating null-check boilerplate in downstream code.
2. Prefer .HasValue() over !string.IsNullOrWhiteSpace() for readability and consistency with Olive's fluent style throughout your codebase.
3. Use .IsValidEmail() for quick input validation but supplement with actual email delivery verification for critical flows, since format validation alone is insufficient.
4. Apply .ToSafeFileName() on all user-provided file names before writing to disk to prevent path traversal and invalid character errors.
5. Use .To<T>() for configuration parsing where missing or invalid values should silently default, and .ToIntOrNull() when you need to detect and report invalid input.
6. Avoid mixing Olive extensions with standard LINQ carelessly -- pick a consistent style within each service class so the code reads uniformly.
7. Use .OrEmpty() on collection parameters at the start of methods to avoid null-reference exceptions when callers pass null collections.
8. Prefer Olive's .ToString(separator) on collections over string.Join() for consistency with the fluent extension method style.
9. Keep Olive usage in application/service layers rather than in domain entities, since domain types should be self-validating and not depend on utility extensions.
10. Pin the Olive NuGet version in your project to avoid breaking changes across minor versions, since the library evolves its API surface actively.