DocumentDocuments Class

Summary

Represents a collection of LEADDocument objects.

Syntax

C++/CLI

Java

Python

[CollectionDataContractAttribute()] 
public class DocumentDocuments : LeadCollection<LEADDocument>

public [CollectionDataContractAttribute] 
   ref class DocumentDocuments : LeadCollection<LEADDocument^>

public class DocumentDocuments extends LeadCollection<DocumentDocument>

class DocumentDocuments(LeadCollection):

Remarks

DocumentDocuments manages the children of the document. It can be accessed through the Documents property of LEADDocument.

DocumentDocuments derives from LeadCollection<T> and this can implement [System.Collections.ObjectModel.Collection1](https://msdn.microsoft.com/en-us/library/System.Collections.ObjectModel.Collection1.aspx). You can use any of the collection methods to iterate through the documents. This collection is read-only however and you cannot add, remove or change the items. Instead, use Pages to add or remove pages that belong to a document separate from this one. The LEADDocument.Documents collection will automatically get updated to reflect what child documents are currently held in the document.

Here is an example that shows what happens to LEADDocument.Documents when pages are added and removed:

When document (virtualDocument is created, LEADDocument.Documents is an empty collection.
The user creates a new empty page using CreatePage of virtualDocument and then adds it to the LEADDocument.Pages collection. The LEADDocument.Documents collection will still be an empty collection since the page's original owner is the same document (in other words, DocumentPage.Document is virtualDocument).
The user adds a page from another document (document1) into LEADDocument.Pages of virtualDocument. The LEADDocument.Documents collection will contain a single item: document1
The user adds another page from document1 into LEADDocument.Pages of virtualDocument. The LEADDocument.Documents collection will still contain the single item document1 since both pages have the same owner.
The user adds a page from document2 into LEADDocument.Pages of virtualDocument. The LEADDocument.Documents collection will contain two items: document1 and document2.
The user removes the last page from virtualDocument. The LEADDocument.Documents collection will contain the single item document1.
The user removes all the pages from virtualDocument. The LEADDocument.Documents collection will be empty.

When LEADDocument.SaveToCache is called, the document will store the IDs of all the child documents.

When DocumentFactory.LoadFromCache is called, the document will try to re-load all the child documents and automatically add them into this collection. If any document fails to load or is no longer available in the cache, then all of its pages are removed automatically and are not loaded.

When the document is disposed, the value of AutoDisposeDocuments is examined. If it is true, then all the child documents are disposed as well.

Example

Java

using Leadtools; 
using Leadtools.Caching; 
using Leadtools.Document; 
 
 
public void DocumentFactoryCreateExample() 
{ 
   var cache = GetCache(); 
 
   // Create a new document 
   var createOptions = new CreateDocumentOptions(); 
   createOptions.Cache = cache; 
   createOptions.Descriptor = null; 
   createOptions.MimeType = null; 
   createOptions.UseCache = true; 
   createOptions.UserId = null; 
 
   Console.WriteLine("Cache Policy: {0}", createOptions.CachePolicy.AbsoluteExpiration); 
 
   string documentId = null; 
 
   using (LEADDocument document = DocumentFactory.Create(createOptions)) 
   { 
      document.Name = "Virtual"; 
 
      // Should have 0 pages and documents 
      System.Diagnostics.Debug.Assert(document.Pages.Count == 0); 
      System.Diagnostics.Debug.Assert(document.Documents.Count == 0); // DocumentDocuments reference 
 
      // Add page 1 and 2 from a PDF file 
      LoadDocumentOptions loadOptions = new LoadDocumentOptions(); 
      loadOptions.Cache = cache; 
      LEADDocument childDocument = DocumentFactory.LoadFromFile(Path.Combine(LEAD_VARS.ImagesDir, "Leadtools.pdf"), loadOptions); 
      // Do not dispose the child documents, but save it into the cache 
      // This is optional and is done in this example since we will try to re-load the parent document 
      // from the cache - and the child documents should be in the cache as well 
      childDocument.SaveToCache(); 
      // Now add the pages 
      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 page 3 and 4 from a TIF file 
      childDocument = DocumentFactory.LoadFromFile(Path.Combine(LEAD_VARS.ImagesDir, "ocr1.tif"), loadOptions); 
      // Also save it into the cache 
      childDocument.SaveToCache(); 
      // Now add the pages 
      document.Pages.Add(childDocument.Pages[0]); 
      document.Pages.Add(childDocument.Pages[0]); 
 
      // Should have 5 pages and 2 documents (the PDF and the TIF) 
      System.Diagnostics.Debug.Assert(document.Pages.Count == 5); 
      System.Diagnostics.Debug.Assert(document.Documents.Count == 2); 
 
      // Tell the parent document to dispose any child documents when the parent is disposed 
      document.AutoDisposeDocuments = true; 
 
      // Show the info of this document, should say 5 pages 
      Console.WriteLine("Original document information"); 
      PrintOutDocumentInfo(document); 
 
      // Now save, the parent document into the cache 
      document.SaveToCache(); 
 
      // And tell all documents to not delete themselves from the cache 
      document.AutoDeleteFromCache = false; 
 
      // Save the ID so we can load it 
      documentId = document.DocumentId; 
   } 
 
   // Now, load the document from the cache 
   var loadFromCacheOptions = new LoadFromCacheOptions(); 
   loadFromCacheOptions.Cache = cache; 
   loadFromCacheOptions.DocumentId = documentId; 
   using (LEADDocument document = DocumentFactory.LoadFromCache(loadFromCacheOptions)) 
   { 
      // Should have 5 pages and 2 documents (the PDF and the TIF) 
      System.Diagnostics.Debug.Assert(document.Pages.Count == 5); 
      System.Diagnostics.Debug.Assert(document.Documents.Count == 2); 
 
      // Show the info of this document, should still say 5 pages 
      Console.WriteLine("Loaded from cache information"); 
      PrintOutDocumentInfo(document); 
 
      // Delete first page 
      document.Pages.RemoveAt(0); 
      // Delete the last page 
      document.Pages.RemoveAt(document.Pages.Count - 1); 
 
      // Should have 3 pages and 2 documents (the PDF and the TIF) 
      System.Diagnostics.Debug.Assert(document.Pages.Count == 3); 
      System.Diagnostics.Debug.Assert(document.Documents.Count == 2); 
 
      Console.WriteLine("After removing the first 2 pages"); 
      PrintOutDocumentInfo(document); 
 
      // Delete this document and all its children from the cache when we are disposed 
      document.AutoDeleteFromCache = true; 
   } 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.URI; 
import java.net.URISyntaxException; 
import java.util.Calendar; 
 
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.caching.*; 
import leadtools.document.*; 
 
 
public void documentFactoryCreateExample() throws IOException { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   FileCache cache = getCache(); 
 
   // Create a new document 
   CreateDocumentOptions createOptions = new CreateDocumentOptions(); 
   createOptions.setCache(cache); 
   createOptions.setDescriptor(null); 
   createOptions.setMimeType(null); 
   createOptions.setUseCache(true); 
 
   System.out.println("Cache Policy: " + createOptions.getCachePolicy().getAbsoluteExpiration()); 
 
   String documentId = null; 
 
   LEADDocument document = DocumentFactory.create(createOptions); 
 
   document.setName("Virtual"); 
 
   // Should have 0 pages and documents 
   assertTrue(document.getPages().size() == 0); 
 
   // Add page 1 and 2 from a PDF file 
   LoadDocumentOptions loadOptions = new LoadDocumentOptions(); 
   loadOptions.setCache(cache); 
   LEADDocument childDocument = DocumentFactory.loadFromFile(combine(LEAD_VARS_IMAGES_DIR, "Leadtools.pdf"), 
         loadOptions); 
   // Do not dispose the child documents, but save it into the cache 
   // This is optional and is done in this example since we will try to re-load the 
   // parent document 
   // from the cache - and the child documents should be in the cache as well 
   childDocument.saveToCache(); 
 
   // Now add the pages 
   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 page 3 and 4 from a TIF file 
   childDocument = DocumentFactory.loadFromFile(combine(LEAD_VARS_IMAGES_DIR, "ocr1.tif"), loadOptions); 
   // Also save it into the cache 
   childDocument.saveToCache(); 
   // Now add the pages 
   document.getPages().add(childDocument.getPages().get(0)); 
   document.getPages().add(childDocument.getPages().get(0)); 
 
   // Should have 5 pages and 2 documents (the PDF and the TIF) 
   assertTrue(document.getPages().size() == 5); 
   assertTrue(document.getDocuments().size() == 2); 
 
   // Tell the parent document to dispose any child documents when the parent is 
   // disposed 
   document.setAutoDisposeDocuments(false); 
 
   // Show the info of this document, should say 5 pages 
   System.out.println("Original document information"); 
   printOutDocumentInfo(document); 
 
   // Now save, the parent document into the cache 
   document.saveToCache(); 
 
   // And tell all documents to not delete themselves from the cache 
   document.setAutoDeleteFromCache(false); 
   // Save the ID so we can load it 
   document.dispose(); 
   documentId = document.getDocumentId(); 
   System.out.println("Docu: " + documentId); 
 
   // Now, load the document from the cache 
   LoadFromCacheOptions loadFromCacheOptions = new LoadFromCacheOptions(); 
   loadFromCacheOptions.setCache(cache); 
   loadFromCacheOptions.setDocumentId(documentId); 
   System.out.println("Load: " + loadFromCacheOptions.getDocumentId()); 
   document = DocumentFactory.loadFromCache(loadFromCacheOptions); 
 
   // Should have 5 pages and 2 documents (the PDF and the TIF) 
   assertTrue(document.getPages().size() == 5); 
   assertTrue(document.getDocuments().size() == 2); 
 
   // Show the info of this document, should still say 5 pages 
   System.out.println("Loaded from cache information"); 
   printOutDocumentInfo(document); 
 
   // Delete first page 
   document.getPages().remove(0); 
   document.getPages().remove(document.getPages().size() - 1); 
   // Delete the last page 
   // Should have 3 pages and 2 documents (the PDF and the TIF) 
   assertTrue(document.getPages().size() == 3); 
   assertTrue(document.getDocuments().size() == 2); 
 
   System.out.println("After removing the first 2 pages"); 
   printOutDocumentInfo(document); 
 
   // Delete this document and all its children from the cache when we are disposed 
   document.setAutoDeleteFromCache(true); 
   document.dispose(); 
}

Requirements

Target Platforms

Reference

DocumentDocuments Members

Leadtools.Document Namespace

Creating Documents with LEADTOOLS Document Library

Loading Using LEADTOOLS Document Library

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Help Version 23.0.2024.2.29

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