5 // FEATURE: static slots for four objects?
6 /** A sensible implementation of the abstract methods in the JS class */
7 public class JSObj extends JS {
9 // this gets around a wierd fluke in the Java type checking rules for ?..:
10 public static final Object T = Boolean.TRUE;
11 public static final Object F = Boolean.FALSE;
13 // FEATURE: be smart here; perhaps intern
14 public static final Number N(int i) { return new Integer(i); }
15 public static final Number N(long l) { return new Long(l); }
16 public static final Number N(double d) { return new Double(d); }
17 public static final Boolean B(boolean b) { return b ? Boolean.TRUE : Boolean.FALSE; }
19 private static Enumeration emptyEnumeration = new Enumeration() {
20 public boolean hasMoreElements() { return false; }
21 public Object nextElement() { throw new NoSuchElementException(); }
24 private Hash entries = null;
26 public Enumeration keys() { return entries == null ? emptyEnumeration : entries.keys(); }
27 public Object get(Object key) { return entries == null ? null : entries.get(key, null); }
28 public void put(Object key, Object val) { if (entries == null) entries = new Hash(); entries.put(key, null, val); }
30 // note that we don't actually implement trappable... we just provide these for subclasses which choose to
31 public JSTrap getTrap(Object key) { return entries == null ? null : (JSTrap)entries.get(key, JSTrap.class); }
32 public void putTrap(Object key, JSTrap t) { if (entries == null) entries = new Hash(); entries.put(key, JSTrap.class, t); }