| Methods Summary |
|---|
| public static java.lang.reflect.Method | findMethod(java.lang.Class targetClass, java.lang.String methodName, java.lang.Class[] argClasses)
Method m = findPublicMethod(targetClass, methodName, argClasses);
if (m != null && Modifier.isPublic(m.getDeclaringClass().getModifiers())) {
return m;
}
/*
Search the interfaces for a public version of this method.
Example: the getKeymap() method of a JTextField
returns a package private implementation of the
of the public Keymap interface. In the Keymap
interface there are a number of "properties" one
being the "resolveParent" property implied by the
getResolveParent() method. This getResolveParent()
cannot be called reflectively because the class
itself is not public. Instead we search the class's
interfaces and find the getResolveParent()
method of the Keymap interface - on which invoke
may be applied without error.
So in :-
JTextField o = new JTextField("Hello, world");
Keymap km = o.getKeymap();
Method m1 = km.getClass().getMethod("getResolveParent", new Class[0]);
Method m2 = Keymap.class.getMethod("getResolveParent", new Class[0]);
Methods m1 and m2 are different. The invocation of method
m1 unconditionally throws an IllegalAccessException where
the invocation of m2 will invoke the implementation of the
method. Note that (ignoring the overloading of arguments)
there is only one implementation of the named method which
may be applied to this target.
*/
for(Class type = targetClass; type != null; type = type.getSuperclass()) {
Class[] interfaces = type.getInterfaces();
for(int i = 0; i < interfaces.length; i++) {
m = findPublicMethod(interfaces[i], methodName, argClasses);
if (m != null) {
return m;
}
}
}
return null;
|
| public static java.lang.reflect.Method | findPublicMethod(java.lang.Class declaringClass, java.lang.String methodName, java.lang.Class[] argClasses)
// Many methods are "getters" which take no arguments.
// This permits the following optimisation which
// avoids the expensive call to getMethods().
if (argClasses.length == 0) {
try {
return MethodUtil.getMethod(declaringClass, methodName, argClasses);
}
catch (NoSuchMethodException e) {
return null;
} catch (SecurityException se) {
// fall through
}
}
Method[] methods = MethodUtil.getPublicMethods(declaringClass);
List list = new ArrayList();
for(int i = 0; i < methods.length; i++) {
// Collect all the methods which match the signature.
Method method = methods[i];
if (method.getName().equals(methodName)) {
if (matchArguments(argClasses, method.getParameterTypes())) {
list.add(method);
}
}
}
if (list.size() > 0) {
if (list.size() == 1) {
return (Method)list.get(0);
}
else {
ListIterator iterator = list.listIterator();
Method method;
while (iterator.hasNext()) {
method = (Method)iterator.next();
if (matchExplicitArguments(argClasses, method.getParameterTypes())) {
return method;
}
}
// There are more than one method which matches this signature.
// try to return the most specific method.
return getMostSpecificMethod(list, argClasses);
}
}
return null;
|
| public static java.lang.reflect.Constructor | getConstructor(java.lang.Class cls, java.lang.Class[] args)Return a constructor on the class with the arguments.
Constructor constructor = null;
// PENDING: Implement the resolutuion of ambiguities properly.
Constructor[] ctors = ConstructorUtil.getConstructors(cls);
for(int i = 0; i < ctors.length; i++) {
if (matchArguments(args, ctors[i].getParameterTypes())) {
constructor = ctors[i];
}
}
return constructor;
|
| public static synchronized java.lang.reflect.Method | getMethod(java.lang.Class targetClass, java.lang.String methodName, java.lang.Class[] argClasses)A wrapper to findMethod(), which will search or populate the method
in a cache.
Object signature = new Signature(targetClass, methodName, argClasses);
Method method = null;
Map methodCache = null;
boolean cache = false;
if (ReflectUtil.isPackageAccessible(targetClass)) {
cache = true;
}
if (cache && methodCacheRef != null &&
(methodCache = (Map)methodCacheRef.get()) != null) {
method = (Method)methodCache.get(signature);
if (method != null) {
return method;
}
}
method = findMethod(targetClass, methodName, argClasses);
if (cache && method != null) {
if (methodCache == null) {
methodCache = new HashMap();
methodCacheRef = new SoftReference(methodCache);
}
methodCache.put(signature, method);
}
return method;
|
| private static java.lang.reflect.Method | getMostSpecificMethod(java.util.List methods, java.lang.Class[] args)Return the most specific method from the list of methods which
matches the args. The most specific method will have the most
number of equal parameters or will be closest in the inheritance
heirarchy to the runtime execution arguments.
See the JLS section 15.12
http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#20448
Method method = null;
int matches = 0;
int lastMatch = matches;
ListIterator iterator = methods.listIterator();
while (iterator.hasNext()) {
Method m = (Method)iterator.next();
Class[] mArgs = m.getParameterTypes();
matches = 0;
for (int i = 0; i < args.length; i++) {
Class mArg = mArgs[i];
if (mArg.isPrimitive()) {
mArg = typeToClass(mArg);
}
if (args[i] == mArg) {
matches++;
}
}
if (matches == 0 && lastMatch == 0) {
if (method == null) {
method = m;
} else {
// Test existing method. We already know that the args can
// be assigned to all the method params. However, if the
// current method parameters is higher in the inheritance
// hierarchy then replace it.
if (!matchArguments(method.getParameterTypes(),
m.getParameterTypes())) {
method = m;
}
}
} else if (matches > lastMatch) {
lastMatch = matches;
method = m;
} else if (matches == lastMatch) {
// ambiguous method selection.
method = null;
}
}
return method;
|
| public static java.lang.Object | getPrivateField(java.lang.Object instance, java.lang.Class cls, java.lang.String name)
return getPrivateField(instance, cls, name, null);
|
| public static java.lang.Object | getPrivateField(java.lang.Object instance, java.lang.Class cls, java.lang.String name, java.beans.ExceptionListener el)Returns the value of a private field.
try {
Field f = cls.getDeclaredField(name);
f.setAccessible(true);
return f.get(instance);
}
catch (Exception e) {
if (el != null) {
el.exceptionThrown(e);
}
}
return null;
|
| static java.lang.reflect.Method | getPublicMethod(java.lang.Class declaringClass, java.lang.String methodName, java.lang.Class[] argClasses)
Method m;
m = findPublicMethod(declaringClass, methodName, argClasses);
if (m == null)
throw new NoSuchMethodException(declaringClass.getName() + "." + methodName);
return m;
|
| public static boolean | isPrimitive(java.lang.Class type)
return primitiveTypeFor(type) != null;
|
| private static boolean | matchArguments(java.lang.Class[] argClasses, java.lang.Class[] argTypes)Tests each element on the class arrays for assignability.
return matchArguments(argClasses, argTypes, false);
|
| private static boolean | matchArguments(java.lang.Class[] argClasses, java.lang.Class[] argTypes, boolean explicit)
boolean match = (argClasses.length == argTypes.length);
for(int j = 0; j < argClasses.length && match; j++) {
Class argType = argTypes[j];
if (argType.isPrimitive()) {
argType = typeToClass(argType);
}
if (explicit) {
// Test each element for equality
if (argClasses[j] != argType) {
match = false;
}
} else {
// Consider null an instance of all classes.
if (argClasses[j] != null &&
!(argType.isAssignableFrom(argClasses[j]))) {
match = false;
}
}
}
return match;
|
| private static boolean | matchExplicitArguments(java.lang.Class[] argClasses, java.lang.Class[] argTypes)Tests each element on the class arrays for equality.
return matchArguments(argClasses, argTypes, true);
|
| public static java.lang.Class | primitiveTypeFor(java.lang.Class wrapper)
if (wrapper == Boolean.class) return Boolean.TYPE;
if (wrapper == Byte.class) return Byte.TYPE;
if (wrapper == Character.class) return Character.TYPE;
if (wrapper == Short.class) return Short.TYPE;
if (wrapper == Integer.class) return Integer.TYPE;
if (wrapper == Long.class) return Long.TYPE;
if (wrapper == Float.class) return Float.TYPE;
if (wrapper == Double.class) return Double.TYPE;
if (wrapper == Void.class) return Void.TYPE;
return null;
|
| public static java.lang.Class | typeToClass(java.lang.Class type)
return type.isPrimitive() ? ObjectHandler.typeNameToClass(type.getName()) : type;
|
