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Annotation of java/classes/org/w3c/tools/widgets/ImageCache.java, revision 1.3

1.1       abaird      1: // ImageCache.java
1.3     ! bmahe       2: // $Id: ImageCache.java,v 1.2 1997/05/21 15:43:49 ylafon Exp $
1.1       abaird      3: // Author: Jean-Michel.Leon@sophia.inria.fr
                      4: // (c) COPYRIGHT MIT and INRIA, 1997.
                      5: // Please first read the full copyright statement in file COPYRIGHT.html
                      6: 
1.3     ! bmahe       7: package org.w3c.tools.widgets;
1.1       abaird      8: 
                      9: import java.awt.*;
                     10: import java.util.*;
                     11: 
                     12: 
                     13: /**
                     14:  * A Basic Image Cache class.
                     15:  */
                     16: public class ImageCache {
                     17:     private static Hashtable images = new Hashtable();
                     18: 
                     19:    /**
                     20:     * Gets an Image of the requested size.
                     21:     *
                     22:     * Checks if an Image already exists in the cache for the current Thread and
                     23:     * if this image is large enough. Else, creates a new Image and store it in
                     24:     * the cache.
                     25:     */
                     26:     static public Image getImage(Component c, int w, int h) {
                     27:        Image img = (Image)images.get(Thread.currentThread());
                     28:        if((img == null) || (img.getWidth(c) < w) || (img.getHeight(c) < h)) {
                     29:            img = c.createImage(w, h);
                     30:            images.put(Thread.currentThread(), img);
                     31:        }
                     32:        return img;
                     33:     }
                     34: }