Package org.jxmapviewer.viewer

Class TileCache

java.lang.Object
org.jxmapviewer.viewer.TileCache
public class TileCache
extends java.lang.Object
An implementation only class for now. For internal use only.

  • Constructor Summary

    Constructors 
    Constructor Description
    TileCache()
    Default constructor - Empty

  • Method Summary

    Modifier and Type Method Description
    java.awt.image.BufferedImage get​(java.net.URI uri)
    Returns a buffered image for the requested URI from the cache.
    void needMoreMemory()
    Request that the cache free up some memory.
    void put​(java.net.URI uri, byte[] bimg, java.awt.image.BufferedImage img)
    Put a tile image into the cache.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • TileCache

      public TileCache()
      Default constructor - Empty

  • Method Details

    • put

      public void put​(java.net.URI uri, byte[] bimg, java.awt.image.BufferedImage img)
      Put a tile image into the cache. This puts both a buffered image and array of bytes that make up the compressed image.
      Parameters:
      uri - URI of image that is being stored in the cache
      bimg - bytes of the compressed image, ie: the image file that was loaded over the network
      img - image to store in the cache

    • get

      public java.awt.image.BufferedImage get​(java.net.URI uri) throws java.io.IOException
      Returns a buffered image for the requested URI from the cache. This method must return null if the image is not in the cache. If the image is unavailable but it's compressed version *is* available, then the compressed version will be expanded and returned.
      Parameters:
      uri - URI of the image previously put in the cache
      Returns:
      the image matching the requested URI, or null if not available
      Throws:
      java.io.IOException - if retrieval fails

    • needMoreMemory

      public void needMoreMemory()
      Request that the cache free up some memory. How this happens or how much memory is freed is up to the TileCache implementation. Subclasses can implement their own strategy. The default strategy is to clear out all buffered images but retain the compressed versions.