DocumentFactory Class

Summary

Provides support for loading and creating Document objects as well as managing the global cache.

Syntax

C++/CLI

Java

Python

public static class DocumentFactory

public ref class DocumentFactory sealed abstract

public final class DocumentFactory

class DocumentFactory:

Remarks

The main class used for the LEADTOOLS Document class library is LEADDocument. This class abstracts the internal implementation to provide unified properties and methods to access the internal document. Users can create a new document or load existing documents from disk file or a URL.

Documents cannot be created directly. Instead, use the static DocumentFactory methods to obtain a LEADDocument instance, as follows:

Member	Description
LoadFromFile	Loads a document from existing data stored in a disk file.
LoadFromUri	Loads a document from existing data stored in a remote URI.
LoadFromUriAsync	Loads a document asynchronously from an existing data stored in remote URI.
LoadFromStream	Loads a document from existing data stored in a stream.
Create	Creates a new empty virtual document.
MimeTypes	MIME type whitelisting support.
RasterCodecsTemplate	Global template used when loading and saving raster and SVG images.

These methods, when combined with the ObjectCache, provide the following extra functionality:

Member	Description
Cache	The global LEADTOOLS ObjectCache object responsible for managing cache items and expiration policies. The cache can be stored in this value (if the system requires the use of a single global cache) or a new instance is passed directly to the various uploading, loading and saving methods to use distinct or shared caches with each document.
Create	Creates a new empty document.
LoadFromCache	Loads a previously saved document from the cache.
DocumentFactory	Deletes a document from the cache.
GetDocumentCacheInfo	Retrieves information about a document in the cache.
BeginUpload, UploadDocument, UploadAnnotations and AbortUploadDocument	Supports uploading a document to the cache system used by the factory.
DownloadDocument and DownloadAnnotations	Supports uploading a document to the cache system used by the factory.
CloneDocument	Clones (creates a copy) of an existing document in the cache.

Example

using Leadtools; 
using Leadtools.Caching; 
using Leadtools.Document; 
 
 
public void DocumentFactoryExample() 
{ 
   var options = new LoadDocumentOptions(); 
   using (var document = DocumentFactory.LoadFromFile(Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf"), options)) 
   { 
      PrintOutDocumentInfo(document); 
   } 
} 
 
public void PrintOutDocumentInfo(LEADDocument document) 
{ 
   Console.WriteLine("General"); 
   Console.WriteLine("  DocumentId:" + document.DocumentId); 
   if (document.Uri != null) 
      Console.WriteLine("  Uri:" + document.Uri); 
   Console.WriteLine("  Name:" + document.Name); 
   Console.WriteLine("  CacheStatus:" + document.CacheStatus); 
   Console.WriteLine("  LastCacheSyncTime:" + document.LastCacheSyncTime); 
   Console.WriteLine("  IsReadOnly:" + document.IsReadOnly); 
   Console.WriteLine("  IsLocal:" + document.IsLocal); 
   Console.WriteLine("  MimeType:" + document.MimeType); 
   Console.WriteLine("  IsEncrypted:" + document.IsEncrypted); 
   Console.WriteLine("  IsDecrypted:" + document.IsDecrypted); 
   Console.WriteLine("  UserData:" + document.UserData); 
   Console.WriteLine("Cache"); 
   Console.WriteLine("  HasCache:" + document.HasCache); 
   Console.WriteLine("  AutoDeleteFromCache:" + document.AutoDeleteFromCache); 
   Console.WriteLine("Metadata"); 
   foreach (var item in document.Metadata) 
      Console.WriteLine("  {0} {1}", item.Key, item.Value); 
 
   Console.WriteLine("Documents"); 
   Console.WriteLine("  Count:" + document.Documents.Count); 
   foreach (var childDocument in document.Documents) 
   { 
      Console.WriteLine("    Name:" + childDocument.Name); 
   } 
 
   Console.WriteLine("Pages"); 
   Console.WriteLine("  Count:" + document.Pages.Count); 
 
   for (var pageNumber = 1; pageNumber <= document.Pages.Count; pageNumber++) 
   { 
      var page = document.Pages[pageNumber - 1]; 
 
      Console.WriteLine("    PageNumber:" + pageNumber); 
      Console.WriteLine("      OriginalPageNumber:" + page.OriginalPageNumber); 
      Console.WriteLine("      OriginalDocumentName:" + page.Document.Name); 
      Console.WriteLine("      Size:{0}", page.Size); 
   } 
 
   Console.WriteLine("--------"); 
} 
 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}