Package org.loboevolution.pdfview

Class Cache

java.lang.Object
org.loboevolution.pdfview.Cache
public class Cache extends Object
A cache of PDF pages and images.

  • Constructor Details

    • Cache

      public Cache()
      Creates a new instance of a Cache

  • Method Details

    • addPage

      public void addPage(Integer pageNumber, PDFPage page)
      Add a page to the cache. This method should be used for pages which have already been completely rendered.
      Parameters:
      pageNumber - the page number of this page
      page - the page to add

    • addPage

      public void addPage(Integer pageNumber, PDFPage page, PDFParser parser)
      Add a page to the cache. This method should be used for pages which are still in the process of being rendered.
      Parameters:
      pageNumber - the page number of this page
      page - the page to add
      parser - the parser which is parsing this page

    • addImage

      public void addImage(PDFPage page, ImageInfo info, BufferedImage image)
      Add an image to the cache. This method should be used for images which have already been completely rendered
      Parameters:
      page - page this image is associated with
      info - the image info associated with this image
      image - the image to add

    • addImage

      public void addImage(PDFPage page, ImageInfo info, BufferedImage image, PDFRenderer renderer)
      Add an image to the cache. This method should be used for images which are still in the process of being rendered.
      Parameters:
      page - the page this image is associated with
      info - the image info associated with this image
      image - the image to add
      renderer - the renderer which is rendering this page

    • getPage

      public PDFPage getPage(Integer pageNumber)
      Get a page from the cache
      Parameters:
      pageNumber - the number of the page to get
      Returns:
      the page, if it is in the cache, or null if not

    • getPageParser

      public PDFParser getPageParser(Integer pageNumber)
      Get a page's parser from the cache
      Parameters:
      pageNumber - the number of the page to get the parser for
      Returns:
      the parser, or null if it is not in the cache

    • getImage

      public BufferedImage getImage(PDFPage page, ImageInfo info)
      Get an image from the cache
      Parameters:
      page - the page the image is associated with
      info - the image info that describes the image
      Returns:
      the image if it is in the cache, or null if not

    • getImageRenderer

      public PDFRenderer getImageRenderer(PDFPage page, ImageInfo info)
      Get an image's renderer from the cache
      Parameters:
      page - the page this image was generated from
      info - the image info describing the image
      Returns:
      the renderer, or null if it is not in the cache

    • removePage

      public void removePage(Integer pageNumber)
      Remove a page and all its associated images, as well as its parser and renderers, from the cache
      Parameters:
      pageNumber - the number of the page to remove

    • removeImage

      public void removeImage(PDFPage page, ImageInfo info)
      Remove an image and its associated renderer from the cache
      Parameters:
      page - the page the image is generated from
      info - the image info of the image to remove