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1
3 package org.python.compiler;
4
5 import java.util.Hashtable  ;
6 import java.util.Enumeration ;
7 import java.lang.reflect.Method ;
8 import java.io.*;
9
10
11 public class AdapterMaker extends ProxyMaker
12 {
13 public AdapterMaker(Class interfac) {
14 super(interfac.getName()+"$Adapter", interfac);
15 }
16
17 public void build() throws Exception {
18 names = new Hashtable ();
19
20 int access = ClassFile.PUBLIC | ClassFile.SYNCHRONIZED;
22 classfile = new ClassFile(myClass, "java/lang/Object", access);
23
24 classfile.addInterface(mapClass(interfaces[0]));
25
26 addMethods(interfaces[0], new Hashtable ());
27 addConstructors(Object .class);
28 doConstants();
29 }
30
31
32 public static String makeAdapter(Class interfac, OutputStream ostream)
33 throws Exception
34 {
35 AdapterMaker pm = new AdapterMaker(interfac);
36 pm.build();
37 pm.classfile.write(ostream);
38 return pm.myClass;
39 }
40
41 public void doConstants() throws Exception {
42 for (Enumeration e=names.keys(); e.hasMoreElements();) {
43 String name = (String )e.nextElement();
44 classfile.addField(name, "Lorg/python/core/PyObject;",
45 ClassFile.PUBLIC);
46 }
47 }
48
49 public void addMethod(Method method, int access) throws Exception {
50 Class [] parameters = method.getParameterTypes();
51 Class ret = method.getReturnType();
52 String sig = makeSignature(parameters, ret);
53
54 String name = method.getName();
55 names.put(name, name);
57
58 Code code = classfile.addMethod(name, sig, ClassFile.PUBLIC);
59
60 code.aload(0);
61 int pyfunc = code.pool.Fieldref(classfile.name, name,
62 "Lorg/python/core/PyObject;");
63 code.getfield(pyfunc);
64 code.dup();
65 Label returnNull = code.getLabel();
66 code.ifnull(returnNull);
67 callMethod(code, name, parameters, ret, method.getExceptionTypes());
68 returnNull.setPosition();
69 doNullReturn(code, ret);
70 }
71 }
72 |
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Java API By Example, From Geeks To Geeks.