1 // Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
4 import org.ibex.util.*;
7 import java.lang.reflect.*;
9 /** Automatic JS-ification via Reflection (not for use in the core) */
10 public class JSReflection extends JS {
12 public static Object wrap(Object o) throws JSExn {
13 if (o == null) return null;
14 if (o instanceof String) return o;
15 if (o instanceof Boolean) return o;
16 if (o instanceof Number) return o;
17 if (o instanceof JS) return o;
18 if (o instanceof Object[]) {
19 // FIXME: get element type here
21 throw new JSExn("Reflection object tried to return a " + o.getClass().getName());
24 public static class Array extends JS {
26 public Array(Object[] arr) { this.arr = arr; }
27 public Enumeration keys() throws JSExn { return new CounterEnumeration(arr.length); }
28 public Object get(Object key) throws JSExn { return wrap(arr[toInt(key)]); }
29 public void put(Object key, Object val) throws JSExn { throw new JSExn("can't write to org.ibex.js.Reflection.Array's"); }
32 // FIXME public static class Hash { }
33 // FIXME public Enumeration keys() throws JSExn { }
35 public Object get(Object key) throws JSExn {
36 String k = toString(key);
38 Field f = this.getClass().getField(k);
39 return wrap(f.get(this));
40 } catch (NoSuchFieldException nfe) {
41 } catch (IllegalAccessException nfe) {
42 } catch (SecurityException nfe) { }
44 Method[] methods = this.getClass().getMethods();
45 for(int i=0; i<methods.length; i++) if (methods[i].getName().equals(k)) return METHOD;
46 } catch (SecurityException nfe) { }
50 public void put(Object key, Object val) throws JSExn {
51 throw new JSExn("put() not supported yet");
54 public Object callMethod(Object method, Object a0, Object a1, Object a2, Object[] rest, int nargs) throws JSExn {
55 String k = toString(method);
57 Method[] methods = this.getClass().getMethods();
58 for(int j=0; j<methods.length; j++) {
59 if (methods[j].getName().equals(k) && methods[j].getParameterTypes().length == nargs) {
60 Object[] args = new Object[nargs];
61 for(int i = 0; i<args.length; i++) {
62 if (i==0) args[i] = a0;
63 else if (i==1) args[i] = a1;
64 else if (i==2) args[i] = a2;
65 else args[i] = rest[i-3];
67 return wrap(methods[j].invoke(this, args));
70 } catch (IllegalAccessException nfe) {
71 } catch (InvocationTargetException it) {
72 Throwable ite = it.getTargetException();
73 if (ite instanceof JSExn) throw ((JSExn)ite);
75 throw new JSExn("unhandled reflected exception: " + ite.toString());
76 } catch (SecurityException nfe) { }
77 throw new JSExn("called a reflection method with the wrong number of arguments");