2003/09/05 04:28:35

[org.ibex.core.git] / src / org / xwt / plat / GCJ.java

diff --git a/src/org/xwt/plat/GCJ.java b/src/org/xwt/plat/GCJ.java
index 6f545c0..98f3d9b 100644 (file)
--- a/src/org/xwt/plat/GCJ.java
+++ b/src/org/xwt/plat/GCJ.java
@@ -49,6 +49,33 @@ public abstract class GCJ extends Platform {
         private JPEG(InputStream is) { this.is = is; nativeDecompress(); buffer = null; }
         private native void nativeDecompress();
     }
-
+    
+    // FIXME: This could be optimized (a lot) by using a custom hashtable
+    public final static class Retainer {
+        private static Hash table = new Hash();
+        private final static class Key {
+            private Object o;
+            public Key(Object o) { this.o = o; }
+            public int hashCode() { return o == null ? 0 : o.hashCode(); }
+            public boolean equals(Object o2) { return (o2 instanceof Key) && ((Key)o2).o == o; }
+        }
+        private final static class Entry {
+            private int refCount;
+            public Entry() { inc(); }
+            public void inc() { refCount++; }
+            public boolean dec() { return --refCount == 0; }
+        }
+        public static synchronized void retain(Object o) {
+            Key k = new Key(o);
+            Entry r = (Entry) table.get(k);
+            if(r == null) table.put(k,new Entry());
+            else r.inc();
+        }
+        public static synchronized void release(Object o) {
+            Key k = new Key(o);
+            Entry e = (Entry) table.get(k);
+            if(e == null) throw new Error("Retainer::Release on unknown object");
+            if(e.dec()) { table.remove(k); }
+        }
+    }
 }
-