Cache Property

Summary

The cache to use with the new document.

Syntax

C++/CLI

Java

Python

public ObjectCache Cache { get; set; }

public:  
   property ObjectCache^ Cache 
   { 
      ObjectCache^ get() 
      void set(ObjectCache^ value) 
   }

public ObjectCache getCache() 
public void setCache(ObjectCache value)

Cache # get and set (CreateDocumentOptions)

Property Value

The cache to use with the new document. Default value is null.

Remarks

The factory will use the cache stored in one of these locations:

First, the object set in CreateDocumentOptions.Cache. If this value is not null, then it will be used. This allows the use of different cache objects for each document is required.
If the previous member did not have a valid value, then the global object set in DocumentFactory.Cache is checked. If this value is not null, it will be used.

In either case, ObjectCache can be obtained from the document using GetCache and must be setup with a valid LEADTOOLS cache object. The policy to use with this new document to determine when to purge the cache items must be set in CachePolicy.

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

CreateDocumentOptions Class

CreateDocumentOptions Members

Leadtools.Document Namespace

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Leadtools.Document Assembly

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