Added schema validation and schema db

internal/schema/schema.go

@@ -0,0 +1,55 @@
+package schema
+
+import (
+	_ "embed"
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+//go:embed marte.json
+var defaultSchemaJSON []byte
+
+type Schema struct {
+	Classes map[string]ClassDefinition `json:"classes"`
+}
+
+type ClassDefinition struct {
+	Fields  []FieldDefinition `json:"fields"`
+	Ordered bool              `json:"ordered"`
+}
+
+type FieldDefinition struct {
+	Name      string `json:"name"`
+	Type      string `json:"type"` // "int", "float", "string", "bool", "reference", "array", "node", "any"
+	Mandatory bool   `json:"mandatory"`
+}
+
+func NewSchema() *Schema {
+	return &Schema{
+		Classes: make(map[string]ClassDefinition),
+	}
+}
+
+func LoadSchema(path string) (*Schema, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var s Schema
+	if err := json.Unmarshal(content, &s); err != nil {
+		return nil, fmt.Errorf("failed to parse schema: %v", err)
+	}
+
+	return &s, nil
+}
+
+// DefaultSchema returns a built-in schema with core MARTe classes
+func DefaultSchema() *Schema {
+	var s Schema
+	if err := json.Unmarshal(defaultSchemaJSON, &s); err != nil {
+		panic(fmt.Sprintf("failed to parse default embedded schema: %v", err))
+	}
+	return &s
+}