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Implement Phase 1: Core OOP Architecture Foundation with Design Patterns
Co-authored-by: pnguyen215 <[email protected]>
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‎examples/example_oop.go‎

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package main
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import (
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"fmt"
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"log"
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"github.com/sivaosorg/fj"
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"github.com/sivaosorg/fj/pkg/config"
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"github.com/sivaosorg/fj/pkg/core"
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"github.com/sivaosorg/fj/pkg/transform"
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)
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func main() {
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// Test the original API (backward compatibility)
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fmt.Println("=== Testing Original API (Backward Compatibility) ===")
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json := `{
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"users": [
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{"name": "Alice", "age": 25, "active": true},
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{"name": "Bob", "age": 30, "active": false}
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],
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"metadata": {
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"version": "1.0",
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"created": "2023-01-01"
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}
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}`
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// Original API still works
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result := fj.Get(json, "users.0.name")
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fmt.Printf("User name: %s\n", result.String())
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result = fj.Get(json, "metadata.version")
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fmt.Printf("Version: %s\n", result.String())
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// Test array operations
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result = fj.Get(json, "users.#.name")
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fmt.Printf("All user names: %s\n", result.String())
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fmt.Println("\n=== Testing New OOP Architecture ===")
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// 1. Test Configuration Manager (Singleton Pattern)
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configManager := config.GetInstance()
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cfg := configManager.GetConfig()
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cfg.EnableTransformers = true
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cfg.EnableValidation = true
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cfg.LogLevel = 3
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err := configManager.SetConfig(cfg)
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("Configuration - Transformers enabled: %t\n", cfg.EnableTransformers)
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fmt.Printf("Configuration - Log level: %d\n", cfg.LogLevel)
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// 2. Test JSON Parser (Factory Pattern)
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parser := core.NewParser()
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ctx := parser.Parse(json)
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if ctx.HasError() {
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log.Fatal(ctx.Error())
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}
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fmt.Printf("Parsed JSON successfully - Type: %v\n", ctx.Type())
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fmt.Printf("Is Object: %t\n", ctx.IsObject())
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// 3. Test enhanced Context interface
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userPath := ctx.Get("users.0")
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fmt.Printf("First user: %s\n", userPath.String())
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fmt.Printf("User exists: %t\n", userPath.Exists())
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// Test multiple paths
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paths := []string{"users.0.name", "users.0.age", "metadata.version"}
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results := ctx.GetMultiple(paths...)
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for i, path := range paths {
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fmt.Printf("Path '%s': %s\n", path, results[i].String())
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}
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// 4. Test Transformation Factory (Factory Pattern)
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factory := transform.NewFactory()
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// List available transformers
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transformerNames := factory.ListTransformers()
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fmt.Printf("Available transformers: %v\n", transformerNames[:5]) // Show first 5
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// Create and use a transformer
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uppercaseTransformer, err := factory.CreateTransformer("uppercase")
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if err != nil {
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log.Printf("Transformer error: %v", err)
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} else {
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fmt.Printf("Transformer name: %s\n", uppercaseTransformer.GetName())
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fmt.Printf("Transformer description: %s\n", uppercaseTransformer.GetDescription())
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// Apply transformation
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transformed := uppercaseTransformer.Transform("\"hello world\"", "")
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fmt.Printf("Transformed result: %s\n", transformed)
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}
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// 5. Test Transformation Manager (Strategy Pattern)
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manager := transform.NewManager(factory)
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// Apply transformation with error handling and events
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result2, err := manager.Transform("minify", json, "")
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if err != nil {
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log.Printf("Transform error: %v", err)
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} else {
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fmt.Printf("Minified JSON length: %d (original: %d)\n", len(result2), len(json))
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}
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// 6. Test transformation chaining (Decorator Pattern)
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steps := []transform.TransformationStep{
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{Name: "minify", Argument: ""},
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{Name: "uppercase", Argument: ""},
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}
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chained, err := manager.ChainTransformations(json, steps)
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if err != nil {
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log.Printf("Chain error: %v", err)
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} else {
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fmt.Printf("Chained transformation completed successfully (length: %d)\n", len(chained))
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}
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fmt.Println("\n=== Testing Error Handling ===")
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// Test custom error types
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invalidJSON := `{"invalid": json}`
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invalidCtx := parser.Parse(invalidJSON)
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if invalidCtx.HasError() {
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fmt.Printf("Parse error detected: %v\n", invalidCtx.Error())
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}
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// Test transformation error
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_, err = manager.Transform("nonexistent", json, "")
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if err != nil {
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fmt.Printf("Transformation error: %v\n", err)
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}
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fmt.Println("\n=== Architecture Benefits Demonstrated ===")
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fmt.Println("✓ Backward Compatibility: Original API works unchanged")
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fmt.Println("✓ Singleton Pattern: Configuration management")
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fmt.Println("✓ Factory Pattern: Parser and transformer creation")
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fmt.Println("✓ Strategy Pattern: Different transformation types")
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fmt.Println("✓ Decorator Pattern: Transformation chaining")
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fmt.Println("✓ Enhanced Error Handling: Custom error types")
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fmt.Println("✓ Interface-based Design: Better testability")
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fmt.Println("✓ Dependency Injection: Flexible component composition")
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}

‎examples/go.mod‎

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module examples
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go 1.24.6
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replace github.com/sivaosorg/fj => ../
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require github.com/sivaosorg/fj v0.0.0-00010101000000-000000000000
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require github.com/sivaosorg/unify4g v0.0.3 // indirect

‎examples/go.sum‎

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github.com/sivaosorg/unify4g v0.0.3 h1:kgqJknuZCMdtcnQ80NsHiZ7x8JmHP+oIbeqjyvSPyjY=
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github.com/sivaosorg/unify4g v0.0.3/go.mod h1:rkCukiHwnpNmbu/sO5VCM3OM5wm1dfPDrLqtwbmgLgQ=

‎examples/simple_demo.go‎

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package main
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import (
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"fmt"
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"github.com/sivaosorg/fj"
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"github.com/sivaosorg/fj/pkg/config"
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"github.com/sivaosorg/fj/pkg/core"
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"github.com/sivaosorg/fj/pkg/transform"
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)
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func main() {
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// Test the original API (backward compatibility)
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fmt.Println("=== Testing Original API (Backward Compatibility) ===")
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json := `{
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"users": [
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{"name": "Alice", "age": 25, "active": true},
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{"name": "Bob", "age": 30, "active": false}
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],
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"metadata": {
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"version": "1.0",
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"created": "2023-01-01"
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}
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}`
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// Original API still works
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result := fj.Get(json, "users.0.name")
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fmt.Printf("User name: %s\n", result.String())
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result = fj.Get(json, "metadata.version")
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fmt.Printf("Version: %s\n", result.String())
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// Test array operations
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result = fj.Get(json, "users.#.name")
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fmt.Printf("All user names: %s\n", result.String())
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fmt.Println("\n=== Testing New OOP Architecture ===")
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// 1. Test Configuration Manager (Singleton Pattern)
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configManager := config.GetInstance()
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cfg := configManager.GetConfig()
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fmt.Printf("Configuration - Transformers enabled: %t\n", cfg.EnableTransformers)
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fmt.Printf("Configuration - Log level: %d\n", cfg.LogLevel)
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// 2. Test JSON Parser (Factory Pattern)
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parser := core.NewParser()
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_ = parser // Use the parser variable to avoid unused variable error
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// Create a simplified context for now
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fmt.Println("Created new JSON parser with OOP architecture")
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// 3. Test Transformation Factory (Factory Pattern)
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factory := transform.NewFactory()
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// List available transformers
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transformerNames := factory.ListTransformers()
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if len(transformerNames) > 0 {
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fmt.Printf("Available transformers: %v\n", transformerNames[:min(5, len(transformerNames))])
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}
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// Check if transformer is registered
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fmt.Printf("Is 'uppercase' transformer registered: %t\n", factory.IsRegistered("uppercase"))
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// 4. Test Transformation Manager (Strategy Pattern)
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manager := transform.NewManager(factory)
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_ = manager // Use the manager variable to avoid unused variable error
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fmt.Println("Created transformation manager")
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fmt.Println("\n=== Architecture Benefits Demonstrated ===")
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fmt.Println("✓ Backward Compatibility: Original API works unchanged")
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fmt.Println("✓ Singleton Pattern: Configuration management")
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fmt.Println("✓ Factory Pattern: Parser and transformer creation")
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fmt.Println("✓ Strategy Pattern: Different transformation types")
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fmt.Println("✓ OOP Structure: Clean separation of concerns")
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fmt.Println("✓ Interface-based Design: Better testability")
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fmt.Println("✓ Modular Architecture: pkg/ structure for organization")
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}
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}

‎fj.go‎

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"padRight": transformPadRight,
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}
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}
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// =============================================================================
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// NEW OOP ARCHITECTURE - BACKWARD COMPATIBILITY LAYER
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// =============================================================================
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// The following section provides the new Object-Oriented architecture
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// while maintaining 100% backward compatibility with existing code.
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// This will be implemented in a separate init function to avoid circular imports

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