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Improved handing of instances of private classes. Added servlet examples.

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This commit is contained in:
Sam Ruby 2000-02-28 17:02:28 +00:00
parent bafbbea051
commit 6189e219ff
13 changed files with 354 additions and 53 deletions
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68
ext/rpc/java/reflect.java
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@ -102,22 +102,30 @@ class reflect {
//
public static void CreateObject(String name, Object args[], long result) {
try {
Vector matches = new Vector();
Constructor cons[] = Class.forName(name).getConstructors();
for (int i=0; i<cons.length; i++) {
if (cons[i].getParameterTypes().length == args.length) {
setResult(result, cons[i].newInstance(args));
matches.addElement(cons[i]);
}
}
Constructor selected = (Constructor)select(matches, args);
if (selected == null) {
if (args.length > 0) {
throw new InstantiationException("No matching constructor found");
} else {
// for classes which have no visible constructor, return the class
// useful for classes like java.lang.System and java.util.Calendar.
setResult(result, Class.forName(name));
return;
}
}
// for classes which have no visible constructor, return the class
// useful for classes like java.lang.System and java.util.Calendar.
if (args.length == 0) {
setResult(result, Class.forName(name));
return;
}
throw new InstantiationException("No matching constructor found");
Object coercedArgs[] = coerce(selected.getParameterTypes(), args);
setResult(result, selected.newInstance(coercedArgs));
} catch (Exception e) {
setException(result, e);
@ -127,16 +135,20 @@ class reflect {
//
// Select the best match from a list of methods
//
private static Method select(Vector methods, Object args[]) {
if (methods.size() == 1) return (Method) methods.firstElement();
private static Object select(Vector methods, Object args[]) {
if (methods.size() == 1) return methods.firstElement();
Method selected = null;
Object selected = null;
int best = Integer.MAX_VALUE;
for (Enumeration e = methods.elements(); e.hasMoreElements(); ) {
Method method = (Method)e.nextElement();
Object element = e.nextElement();
int weight=0;
Class parms[] = method.getParameterTypes();
Class parms[] = (element instanceof Method) ?
((Method)element).getParameterTypes() :
((Constructor)element).getParameterTypes();
for (int i=0; i<parms.length; i++) {
if (parms[i].isInstance(args[i])) {
for (Class c=parms[i]; (c=c.getSuperclass()) != null; ) {
@ -168,9 +180,9 @@ class reflect {
}
if (weight < best) {
if (weight == 0) return method;
if (weight == 0) return element;
best = weight;
selected = method;
selected = element;
}
}
@ -178,11 +190,13 @@ class reflect {
}
//
// Select the best match from a list of methods
// Coerce arguments when possible to conform to the argument list.
// Java's reflection will automatically do widening conversions,
// unfortunately PHP only supports wide formats, so to be practical
// some (possibly lossy) conversions are required.
//
private static Object[] coerce(Method method, Object args[]) {
private static Object[] coerce(Class parms[], Object args[]) {
Object result[] = args;
Class parms[] = method.getParameterTypes();
for (int i=0; i<args.length; i++) {
if (parms[i].isInstance(args[i])) continue;
if (args[i] instanceof Number && parms[i].isPrimitive()) {
@ -238,10 +252,10 @@ class reflect {
if (!(object instanceof Class) || (jclass==object)) break;
}
Method selected = select(matches, args);
Method selected = (Method)select(matches, args);
if (selected == null) throw new NoSuchMethodException(method);
Object coercedArgs[] = coerce(selected, args);
Object coercedArgs[] = coerce(selected.getParameterTypes(), args);
setResult(result, selected.invoke(object, coercedArgs));
} catch (Exception e) {
@ -258,6 +272,18 @@ class reflect {
try {
for (Class jclass = object.getClass();;jclass=(Class)object) {
while (!Modifier.isPublic(jclass.getModifiers())) {
// OK, some joker gave us an instance of a non-public class
// Substitute the first public interface in its place,
// and barring that, try the superclass
Class interfaces[] = jclass.getInterfaces();
jclass=jclass.getSuperclass();
for (int i=interfaces.length; i-->0;) {
if (Modifier.isPublic(interfaces[i].getModifiers())) {
jclass=interfaces[i];
}
}
}
BeanInfo beanInfo = Introspector.getBeanInfo(jclass);
PropertyDescriptor props[] = beanInfo.getPropertyDescriptors();
for (int i=0; i<props.length; i++) {