1 // Copyright 2002 Adam Megacz, see the COPYING file for licensing [GPL]
6 /** all objects other than Strings and Numbers which are exposed to JS code must implement this interface */
9 public Object get(Object key) throws JS.Exn;
10 public Object put(Object key, Object val) throws JS.Exn;
11 public Object[] enumerateProperties();
12 public String coerceToString() throws JS.Exn;
13 public Num coerceToNumber() throws JS.Exn;
14 public Object call(Object[] args) throws JS.Exn;
16 /** if JS calls a Java method, and the Java method throws an exception, it can only be caught by JS if it is a subclass of Exn. */
17 public static class Exn extends RuntimeException {
18 private Object js = null;
19 public Exn(Object js) { this.js = js; }
20 public Object getObject() { return js; }
23 /** Any object which becomes part of the scope chain must support this interface */
24 public static interface Scope extends JS {
25 public boolean has(Object key);
26 public void declare(String s);
27 public JS getParentScope();
30 /** A mutable, boxed numeric value. These are recycled -- never duplicate references -- use duplicate() instead. */
31 public static class Num implements Cloneable, JS {
35 public boolean isDouble = false;
36 public long longVal = -1;
37 public double doubleVal = -1;
39 private static Vec pool = new Vec();
40 public static synchronized void recycle(Num n) { pool.push(n); }
41 public static synchronized Num getOne() { return (pool.size() > 0) ? (Num)pool.pop() : new Num(); }
43 public Num duplicate() { try { return (Num)clone(); } catch (CloneNotSupportedException c) { throw new Error(c); } }
45 public Object get(Object key) throws JS.Exn { return null; }
46 public Object put(Object key, Object val) throws JS.Exn { throw new JS.Exn("attempt to set a property on a Number"); }
47 public Object[] enumerateProperties() { return new Object[] { }; }
48 public String coerceToString() throws JS.Exn { return isDouble ? String.valueOf(doubleVal) : String.valueOf(longVal); }
49 public Num coerceToNumber() throws JS.Exn { return duplicate(); }
50 public Object call(Object[] args) throws JS.Exn { throw new JS.Exn("attempt to apply the () operator to a Number"); }