fix wrong git ignore

internal/pdf/model/model.go

@@ -0,0 +1,56 @@
+package model
+
+import (
+	"gitea.tecamino.com/paadi/pdfmerge/internal/pdf/core"
+)
+
+// A PDFModel is a higher level PDF construct which can be collapsed into a PDF primitive.
+// Each PDFModel has an underlying Primitive and vice versa.
+// Copies can be made, but care must be taken to do it properly.
+type PdfModel interface {
+	ToPdfObject() core.PdfObject
+	GetContainingPdfObject() core.PdfObject
+}
+
+// The model manager is used to cache Primitive <-> Model mappings where needed.
+// In many cases only Model -> Primitive mapping is needed and only a reference to the Primitive
+// is stored in the Model.  In some cases, the Model needs to be found from the Primitive,
+// and that is where the ModelManager can be used (in both directions).
+//
+// Note that it is not always used, the Primitive <-> Model mapping needs to be registered
+// for each time it is used.  Thus, it is only used for special cases, commonly where the same
+// object is used by two higher level objects. (Example PDF Widgets owned by both Page Annotations,
+// and the interactive form - AcroForm).
+type ModelManager struct {
+	primitiveCache map[PdfModel]core.PdfObject
+	modelCache     map[core.PdfObject]PdfModel
+}
+
+func NewModelManager() *ModelManager {
+	mm := ModelManager{}
+	mm.primitiveCache = map[PdfModel]core.PdfObject{}
+	mm.modelCache = map[core.PdfObject]PdfModel{}
+	return &mm
+}
+
+// Register (cache) a model to primitive relationship.
+func (mm *ModelManager) Register(primitive core.PdfObject, model PdfModel) {
+	mm.primitiveCache[model] = primitive
+	mm.modelCache[primitive] = model
+}
+
+func (mm *ModelManager) GetPrimitiveFromModel(model PdfModel) core.PdfObject {
+	primitive, has := mm.primitiveCache[model]
+	if !has {
+		return nil
+	}
+	return primitive
+}
+
+func (mm *ModelManager) GetModelFromPrimitive(primitive core.PdfObject) PdfModel {
+	model, has := mm.modelCache[primitive]
+	if !has {
+		return nil
+	}
+	return model
+}