DocumentHistory Class

Summary

History tracking of LEADDocument.

Syntax

C++/CLI

Python

[DataContractAttribute()] 
public class DocumentHistory

public: 
   [DataContractAttribute] 
   ref class DocumentHistory

class DocumentHistory:

Remarks

DocumentHistory manages the history of the document. It can be accessed through the History property of LEADDocument. It contains an internal list of DocumentHistoryItem objects for each modification or change that occurred in the document.

History tracking is enabled when the value of AutoUpdate is true.

The items can be retrieved, updated or cleared through GetItems, SetItems and Clear respectively.

For more information, refer to Document Toolkit History Tracking.

Example

This example enables history tracking on a document and shows the results.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Document.Writer; 
 
using Leadtools.Document; 
using Leadtools.Caching; 
using Leadtools.Annotations.Engine; 
using Leadtools.Ocr; 
using Leadtools.Barcode; 
using Leadtools.Document.Converter; 
 
public void DocumentHistoryExample() 
{ 
   // Setup a cache 
   FileCache cache = new FileCache(); 
   cache.CacheDirectory = @"c:\cache-dir"; 
 
   // Create a new document 
   var createOptions = new CreateDocumentOptions(); 
   const string documentId = "virtual"; 
   createOptions.Cache = cache; 
   createOptions.DocumentId = documentId; 
 
   using (var document = DocumentFactory.Create(createOptions)) 
   { 
      document.Name = "Virtual"; 
      // DocumentHistory reference 
      document.History.AutoUpdate = true; 
      document.IsReadOnly = false; 
 
      // Show its history 
      ShowHistory("virtual", document); 
 
      // Ensure it has no pages 
      Debug.Assert(document.Pages.Count == 0); 
      Debug.Assert(document.Documents.Count == 0); 
 
      // Add some pages 
 
      // First add the first 2 pages from a PDF file 
      var loadOptions = new LoadDocumentOptions(); 
      loadOptions.Cache = cache; 
      LEADDocument childDocument = DocumentFactory.LoadFromUri(new Uri("https://demo.leadtools.com/images/pdf/leadtools.pdf"), loadOptions); 
      childDocument.AutoDeleteFromCache = false; 
      childDocument.SaveToCache(); 
      childDocument.Annotations.SetHistory(childDocument.Annotations.GetHistory()); 
      document.Pages.Add(childDocument.Pages[0]); 
      document.Pages.Add(childDocument.Pages[1]); 
 
      // Add an empty page 
      var documentPage = document.Pages.CreatePage(LeadSizeD.Create(LEADDocument.UnitsPerInch * 8.5, LEADDocument.UnitsPerInch * 11), 300); 
      document.Pages.Add(documentPage); 
 
      // Add last 2 pages from a TIFF file 
 
      childDocument = DocumentFactory.LoadFromUri(new Uri("https://demo.leadtools.com/images/pdf/leadtools.pdf"), loadOptions); 
      childDocument.AutoDeleteFromCache = false; 
      childDocument.SaveToCache(); 
      document.Pages.Add(childDocument.Pages[2]); 
      document.Pages.Add(childDocument.Pages[3]); 
 
      // Check the document 
      Debug.Assert(5 == document.Pages.Count); 
      Debug.Assert(2 == document.Documents.Count); 
 
      // Get each DocumentHistoryItem 
      foreach (DocumentHistoryItem item in document.History.GetItems()) 
      { 
         document.History.SetItems(null); 
         Console.WriteLine(item); 
      } 
 
      // Enumerate through DocumentHistoryModifyType 
      DocumentHistoryModifyType[] modifyType = (DocumentHistoryModifyType[])Enum.GetValues(typeof(DocumentHistoryModifyType)); 
      foreach (var type in modifyType) 
      { 
         Console.WriteLine($"Type of modification: {type}"); 
      } 
 
      document.AutoDisposeDocuments = true; 
      document.AutoDeleteFromCache = false; 
      document.SaveToCache(); 
   } 
 
   // Load it and show its history 
   var loadFromCacheOptions = new LoadFromCacheOptions(); 
   loadFromCacheOptions.Cache = cache; 
   loadFromCacheOptions.DocumentId = documentId; 
   using (var document = DocumentFactory.LoadFromCache(loadFromCacheOptions)) 
   { 
      ShowHistory("virtual pages added", document); 
 
      // Clear the history 
      document.History.Clear(); 
   } 
 
   // Now, load the document from the cache 
   using (var document = DocumentFactory.LoadFromCache(loadFromCacheOptions)) 
   { 
      Debug.Assert(5 == document.Pages.Count); 
      Debug.Assert(2 == document.Documents.Count); 
 
      // Remove some pages 
      document.Pages.RemoveAt(0); 
      document.Pages.RemoveAt(document.Pages.Count - 1); 
      // And rotate another 
      document.Pages[1].Rotate(90); 
 
      Debug.Assert(3 == document.Pages.Count); 
      Debug.Assert(2 == document.Documents.Count); 
 
      ShowHistory("virtual pages removed and rotated", document); 
   } 
 
   // Clean up 
   var deleteFromCacheOptions = new LoadFromCacheOptions(); 
   deleteFromCacheOptions.Cache = cache; 
   deleteFromCacheOptions.DocumentId = documentId; 
   DocumentFactory.DeleteFromCache(deleteFromCacheOptions); 
} 
 
private static void ShowHistory(string message, LEADDocument document) 
{ 
   Console.WriteLine("History " + message); 
   var items = document.History.GetItems(); 
   foreach (var item in items) 
   { 
      Console.WriteLine("  user:{0} timestamp:{1} comment:{2} modifyType:{3} pageNumber:{4}", 
         item.UserId, item.Timestamp, item.Comment, item.ModifyType, item.PageNumber); 
   } 
}

 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.net.MalformedURLException; 
import java.net.URI; 
import java.net.URISyntaxException; 
import java.net.URL; 
import java.nio.file.Files; 
import java.nio.file.Paths; 
import java.util.ArrayList; 
import java.util.Calendar; 
import java.util.List; 
import java.util.concurrent.Callable; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 
import java.util.concurrent.Future; 
import java.util.regex.Pattern; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.annotations.engine.*; 
import leadtools.barcode.*; 
import leadtools.caching.*; 
import leadtools.codecs.*; 
import leadtools.document.*; 
import leadtools.document.DocumentMimeTypes.UserGetDocumentStatusHandler; 
import leadtools.document.converter.*; 
import leadtools.document.writer.*; 
import leadtools.ocr.*; 
 
 
public void documentHistoryExample() throws URISyntaxException { 
   // Setup a cache 
   FileCache cache = new FileCache(); 
   cache.setCacheDirectory("c:\\cache-dir"); 
 
   // Create a new document 
   CreateDocumentOptions createOptions = new CreateDocumentOptions(); 
   final String documentId = "virtual"; 
   createOptions.setCache(cache); 
   createOptions.setDocumentId(documentId); 
 
   LEADDocument document = DocumentFactory.create(createOptions); 
   document.setName("Virtual"); 
   // DocumentHistory reference 
   document.getHistory().setAutoUpdate(true); 
   document.setReadOnly(false); 
 
   // Show its history 
   showHistory("virtual", document); 
 
   // Ensure it has no pages 
   assertTrue(document.getPages().size() == 0); 
   assertTrue(document.getDocuments().size() == 0); 
 
   // Add some pages 
 
   // First add the first 2 pages from a PDF file 
   LoadDocumentOptions loadOptions = new LoadDocumentOptions(); 
   loadOptions.setCache(cache); 
   LEADDocument childDocument = DocumentFactory 
         .loadFromUri(new URI("https://demo.leadtools.com/images/pdf/leadtools.pdf"), loadOptions); 
   childDocument.setAutoDeleteFromCache(false); 
   childDocument.saveToCache(); 
   childDocument.getAnnotations().setHistory(childDocument.getAnnotations().getHistory()); 
   document.getPages().add(childDocument.getPages().get(0)); 
   document.getPages().add(childDocument.getPages().get(1)); 
 
   // Add an empty page 
   DocumentPage documentPage = document.getPages() 
         .createPage(LeadSizeD.create(LEADDocument.UNITS_PER_INCH * 8.5, LEADDocument.UNITS_PER_INCH * 11), 300); 
   document.getPages().add(documentPage); 
 
   // Add last 2 pages from a TIFF file 
 
   childDocument = DocumentFactory.loadFromUri(new URI("https://demo.leadtools.com/images/pdf/leadtools.pdf"), 
         loadOptions); 
   childDocument.setAutoDeleteFromCache(false); 
   childDocument.saveToCache(); 
   document.getPages().add(childDocument.getPages().get(2)); 
   document.getPages().add(childDocument.getPages().get(3)); 
 
   // Check the document 
   assertTrue(5 == document.getPages().size()); 
   assertTrue(2 == document.getDocuments().size()); 
 
   // Get each DocumentHistoryItem 
   for (DocumentHistoryItem item : document.getHistory().getItems()) { 
      document.getHistory().setItems(null); 
      System.out.println(item); 
   } 
 
   // Enumerate through DocumentHistoryModifyType 
   DocumentHistoryModifyType[] modifyType = DocumentHistoryModifyType.values(); 
   for (DocumentHistoryModifyType type : modifyType) { 
      System.out.println("Type of modification: " + type); 
   } 
 
   document.setAutoDisposeDocuments(true); 
   document.setAutoDeleteFromCache(false); 
   document.saveToCache(); 
 
   // Load it and show its history 
   LoadFromCacheOptions loadFromCacheOptions = new LoadFromCacheOptions(); 
   loadFromCacheOptions.setCache(cache); 
   loadFromCacheOptions.setDocumentId(documentId); 
   document = DocumentFactory.loadFromCache(loadFromCacheOptions); 
   showHistory("virtual pages added", document); 
 
   // Clear the history 
   document.getHistory().clear(); 
 
   // Now, load the document from the cache 
   document = DocumentFactory.loadFromCache(loadFromCacheOptions); 
 
   assertTrue(5 == document.getPages().size()); 
   assertTrue(2 == document.getDocuments().size()); 
 
   // Remove some pages 
   document.getPages().remove(0); 
   document.getPages().remove(document.getPages().size() - 1); 
   // And rotate another 
   document.getPages().get(1).rotate(90); 
 
   assertTrue(3 == document.getPages().size()); 
   assertTrue(2 == document.getDocuments().size()); 
 
   showHistory("virtual pages removed and rotated", document); 
 
   // Clean up 
   LoadFromCacheOptions deleteFromCacheOptions = new LoadFromCacheOptions(); 
   deleteFromCacheOptions.setCache(cache); 
   deleteFromCacheOptions.setDocumentId(documentId); 
   DocumentFactory.deleteFromCache(deleteFromCacheOptions); 
} 
 
private void showHistory(String message, LEADDocument document) { 
   System.out.println("History " + message); 
   List<DocumentHistoryItem> items = document.getHistory().getItems(); 
   for (DocumentHistoryItem item : items) { 
      System.out.printf("  user:%s timestamp:%s comment:%s modifyType:%s pageNumber:%s%n", 
            item.getUserId(), item.getTimestamp(), item.getComment(), item.getModifyType(), item.getPageNumber()); 
   } 
 
}

Requirements

Target Platforms

Reference

DocumentHistory Members

Leadtools.Document Namespace

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