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25 
26 package sun.awt.image;
27 
28 import java.awt.image.ImageConsumer;
29 
30 class ImageConsumerQueue {
31     ImageConsumerQueue next;
32 
33     ImageConsumer consumer;
34     boolean interested;
35 
36     Object securityContext;
37     boolean secure;
38 
removeConsumer(ImageConsumerQueue cqbase, ImageConsumer ic, boolean stillinterested)39     static ImageConsumerQueue removeConsumer(ImageConsumerQueue cqbase,
40                                              ImageConsumer ic,
41                                              boolean stillinterested)
42     {
43         ImageConsumerQueue cqprev = null;
44         for (ImageConsumerQueue cq = cqbase; cq != null; cq = cq.next) {
45             if (cq.consumer == ic) {
46                 if (cqprev == null) {
47                     cqbase = cq.next;
48                 } else {
49                     cqprev.next = cq.next;
50                 }
51                 cq.interested = stillinterested;
52                 break;
53             }
54             cqprev = cq;
55         }
56         return cqbase;
57     }
58 
isConsumer(ImageConsumerQueue cqbase, ImageConsumer ic)59     static boolean isConsumer(ImageConsumerQueue cqbase, ImageConsumer ic) {
60         for (ImageConsumerQueue cq = cqbase; cq != null; cq = cq.next) {
61             if (cq.consumer == ic) {
62                 return true;
63             }
64         }
65         return false;
66     }
67 
ImageConsumerQueue(InputStreamImageSource src, ImageConsumer ic)68     ImageConsumerQueue(InputStreamImageSource src, ImageConsumer ic) {
69         consumer = ic;
70         interested = true;
71         // ImageReps do their own security at access time.
72         if (ic instanceof ImageRepresentation) {
73             ImageRepresentation ir = (ImageRepresentation) ic;
74             if (ir.image.source != src) {
75                 throw new SecurityException("ImageRep added to wrong image source");
76             }
77             secure = true;
78         } else {
79             SecurityManager security = System.getSecurityManager();
80             if (security != null) {
81                 securityContext = security.getSecurityContext();
82             } else {
83                 securityContext = null;
84             }
85         }
86     }
87 
toString()88     public String toString() {
89         return ("[" + consumer +
90                 ", " + (interested ? "" : "not ") + "interested" +
91                 (securityContext != null ? ", " + securityContext : "") +
92                 "]");
93     }
94 }
95