com.aspose.words

Interface IResourceLoadingCallback

public interface IResourceLoadingCallback

Implement this interface if you want to control how Aspose.Words loads external resource when importing a document and inserting images using DocumentBuilder.

Examples:

Shows how to customize the process of loading external resources into a document.

 
 public void resourceLoadingCallback() throws Exception {
     Document doc = new Document();
     doc.setResourceLoadingCallback(new ImageNameHandler());

     DocumentBuilder builder = new DocumentBuilder(doc);

     // Images usually are inserted using a URI, or a byte array.
     // Every instance of a resource load will call our callback's ResourceLoading method.
     builder.insertImage("Google logo");
     builder.insertImage("Aspose logo");
     builder.insertImage("Watermark");

     Assert.assertEquals(3, doc.getChildNodes(NodeType.SHAPE, true).getCount());

     doc.save(getArtifactsDir() + "DocumentBase.ResourceLoadingCallback.docx");
 }

 /// <summary>
 /// Allows us to load images into a document using predefined shorthands, as opposed to URIs.
 /// This will separate image loading logic from the rest of the document construction.
 /// </summary>
 private static class ImageNameHandler implements IResourceLoadingCallback {
     public int resourceLoading(final ResourceLoadingArgs args) throws URISyntaxException, IOException {
         if (args.getResourceType() == ResourceType.IMAGE) {
             // If this callback encounters one of the image shorthands while loading an image,
             // it will apply unique logic for each defined shorthand instead of treating it as a URI.
             if ("Google logo".equals(args.getOriginalUri())) {
                 args.setData(DocumentHelper.getBytesFromStream(new URI("http://www.google.com/images/logos/ps_logo2.png").toURL().openStream()));

                 return ResourceLoadingAction.USER_PROVIDED;
             }

             if ("Aspose logo".equals(args.getOriginalUri())) {
                 args.setData(DocumentHelper.getBytesFromStream(getAsposelogoUri().toURL().openStream()));

                 return ResourceLoadingAction.USER_PROVIDED;
             }

             if ("Watermark".equals(args.getOriginalUri())) {
                 InputStream imageStream = new FileInputStream(getImageDir() + "Transparent background logo.png");
                 args.setData(DocumentHelper.getBytesFromStream(imageStream));

                 return ResourceLoadingAction.USER_PROVIDED;
             }
         }

         return ResourceLoadingAction.DEFAULT;
     }
 }
 
 

Method Summary

Modifier and Type	Method and Description
int	resourceLoading(ResourceLoadingArgs args) Called when Aspose.Words loads any external resource.

Method Detail

resourceLoading

int resourceLoading(ResourceLoadingArgs args)
             throws java.lang.Exception

Called when Aspose.Words loads any external resource.

Examples:

Shows how to customize the process of loading external resources into a document.

 
 public void resourceLoadingCallback() throws Exception {
     Document doc = new Document();
     doc.setResourceLoadingCallback(new ImageNameHandler());

     DocumentBuilder builder = new DocumentBuilder(doc);

     // Images usually are inserted using a URI, or a byte array.
     // Every instance of a resource load will call our callback's ResourceLoading method.
     builder.insertImage("Google logo");
     builder.insertImage("Aspose logo");
     builder.insertImage("Watermark");

     Assert.assertEquals(3, doc.getChildNodes(NodeType.SHAPE, true).getCount());

     doc.save(getArtifactsDir() + "DocumentBase.ResourceLoadingCallback.docx");
 }

 /// <summary>
 /// Allows us to load images into a document using predefined shorthands, as opposed to URIs.
 /// This will separate image loading logic from the rest of the document construction.
 /// </summary>
 private static class ImageNameHandler implements IResourceLoadingCallback {
     public int resourceLoading(final ResourceLoadingArgs args) throws URISyntaxException, IOException {
         if (args.getResourceType() == ResourceType.IMAGE) {
             // If this callback encounters one of the image shorthands while loading an image,
             // it will apply unique logic for each defined shorthand instead of treating it as a URI.
             if ("Google logo".equals(args.getOriginalUri())) {
                 args.setData(DocumentHelper.getBytesFromStream(new URI("http://www.google.com/images/logos/ps_logo2.png").toURL().openStream()));

                 return ResourceLoadingAction.USER_PROVIDED;
             }

             if ("Aspose logo".equals(args.getOriginalUri())) {
                 args.setData(DocumentHelper.getBytesFromStream(getAsposelogoUri().toURL().openStream()));

                 return ResourceLoadingAction.USER_PROVIDED;
             }

             if ("Watermark".equals(args.getOriginalUri())) {
                 InputStream imageStream = new FileInputStream(getImageDir() + "Transparent background logo.png");
                 args.setData(DocumentHelper.getBytesFromStream(imageStream));

                 return ResourceLoadingAction.USER_PROVIDED;
             }
         }

         return ResourceLoadingAction.DEFAULT;
     }
 }
 
 

Throws:

java.lang.Exception