diff -r 000000000000 -r 6d1e8eccdc98 javap/src/main/java/org/apidesign/javap/TrapDataIterator.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/javap/src/main/java/org/apidesign/javap/TrapDataIterator.java	Sun Dec 09 16:16:19 2012 +0100
@@ -0,0 +1,42 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package org.apidesign.javap;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+public final class TrapDataIterator {
+    private final java.util.Map<Short, TrapData> exStart = new java.util.HashMap<Short, TrapData>();
+    private final java.util.Map<Short, TrapData> exStop = new java.util.HashMap<Short, TrapData>();
+    private final java.util.Deque<TrapData> current = new java.util.ArrayDeque<TrapData>();
+    
+    TrapDataIterator(Vector exceptionTable) {
+        for (int i=0 ; i < exceptionTable.size(); i++) {
+            final TrapData td = (TrapData)exceptionTable.elementAt(i);
+            exStart.put(td.start_pc, td);
+            exStop.put(td.end_pc, td);
+        }
+    }
+
+    public void advanceTo(int i) {
+        TrapData e = exStart.get((short) i);
+        if (e != null) {
+            current.addFirst(e);
+        }
+        e = exStop.get((short) i);
+        if (e != null) {
+            current.remove(e);
+        }
+    }
+
+    public boolean useTry() {
+        return !current.isEmpty();
+    }
+
+    public TrapData[] current() {
+        return current.toArray(new TrapData[0]);
+    }
+}