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// Copyright (c) Corporation for National Research Initiatives
package org.python.core;
import java.util.Vector;
import java.io.Serializable;
/**
* A python class.
*/
public class PyClass extends PyObject {
/**
* Holds the namespace for this class
*/
public PyObject __dict__;
/**
* The base classes of this class
*/
public PyTuple __bases__;
/**
* The name of this class
*/
public String __name__;
// Store these methods for performance optimization
// These are only used by PyInstance
PyObject __getattr__, __setattr__, __delattr__, __tojava__, __del__,
__contains__;
// Holds the classes for which this is a proxy
// Only used when subclassing from a Java class
protected Class proxyClass;
// xxx map 'super__*' names -> array of methods
protected java.util.HashMap super__methods;
public static PyClass __class__;
PyClass(boolean fakeArg) { // xxx check
super();
proxyClass = null;
}
protected PyClass() {
proxyClass = null;
}
/**
* Create a python class.
*
* @param name name of the class.
* @param bases A list of base classes.
* @param dict The class dict. Normally this dict is returned by the class
* code object.
*
* @see org.python.core.Py#makeClass(String, PyObject[], PyCode, PyObject)
*/
public PyClass(String name, PyTuple bases, PyObject dict) {
this(name, bases, dict, null);
}
/**
* Create a python class which inherits from a java class and where we
* already have generated a proxyclass. If we do not have a pre-generated
* proxyclass, the class initialization method will create such a proxyclass
* if bases contain a java class.
*
* @param name name of the class.
* @param bases A list of base classes.
* @param dict The class dict. Normally this dict is returned by the class
* code object.
*
* @see org.python.core.Py#makeClass(String, PyObject[], PyCode, PyObject,
* Class)
*/
public PyClass(String name, PyTuple bases, PyObject dict, Class proxyClass) {
this.proxyClass = proxyClass;
init(name, bases, dict);
}
protected Class getProxyClass() {
return proxyClass;
}
void init(String name, PyTuple bases, PyObject dict) {
// System.out.println("bases: "+bases+", "+name.string);
// System.out.println("init class: "+name);
__name__ = name;
__bases__ = bases;
__dict__ = dict;
findModule(dict);
if (proxyClass == null) {
Vector interfaces = new Vector();
Class baseClass = null;
for (int i = 0; i < bases.size(); i++) {
Class proxy = ((PyClass) bases.pyget(i)).getProxyClass();
if (proxy != null) {
if (proxy.isInterface()) {
interfaces.addElement(proxy);
} else {
if (baseClass != null) {
throw Py.TypeError("no multiple inheritance "
+ "for Java classes: " + proxy.getName()
+ " and " + baseClass.getName());
}
// xxx explicitly disable this for now, types will allow
// this
if (PyObject.class.isAssignableFrom(proxy)) {
throw Py
.TypeError("subclassing PyObject subclasses"
+ " not supported");
}
baseClass = proxy;
}
}
}
if (baseClass != null || interfaces.size() != 0) {
String proxyName = __name__;
PyObject module = dict.__finditem__("__module__");
if (module != null) {
proxyName = module.toString() + "$" + __name__;
}
proxyClass = MakeProxies.makeProxy(baseClass, interfaces,
__name__, proxyName, __dict__);
}
}
if (proxyClass != null) {
// xxx more efficient way without going through a PyJavaClass?
PyObject superDict = PyJavaClass.lookup(proxyClass).__findattr__(
"__dict__"); // xxx getDict perhaps?
// This code will add in the needed super__ methods to the class
PyObject snames = superDict.__finditem__("__supernames__");
if (snames != null) {
PyObject iter = snames.__iter__();
for (PyObject item; (item = iter.__iternext__()) != null;) {
if (__dict__.__finditem__(item) == null) {
PyObject superFunc = superDict.__finditem__(item);
if (superFunc != null) {
__dict__.__setitem__(item, superFunc);
}
}
}
}
// xxx populate super__methods, experiment.
java.lang.reflect.Method proxy_methods[] = proxyClass.getMethods();
super__methods = new java.util.HashMap();
for (int i = 0; i < proxy_methods.length; i++) {
java.lang.reflect.Method meth = proxy_methods[i];
String meth_name = meth.getName();
if (meth_name.startsWith("super__")) {
java.util.ArrayList samename = (java.util.ArrayList) super__methods
.get(meth_name);
if (samename == null) {
samename = new java.util.ArrayList();
super__methods.put(meth_name, samename);
}
samename.add(meth);
}
}
java.lang.reflect.Method[] empty_methods = new java.lang.reflect.Method[0];
for (java.util.Iterator iter = super__methods.entrySet().iterator(); iter
.hasNext();) {
java.util.Map.Entry entry = (java.util.Map.Entry) iter.next();
// System.out.println(entry.getKey()); // debug
entry.setValue(((java.util.ArrayList) entry.getValue())
.toArray(empty_methods));
}
}
// System.out.println("proxyClasses: "+proxyClasses+", "+
// proxyClasses[0]);
if (dict.__finditem__("__doc__") == null) {
dict.__setitem__("__doc__", Py.None);
}
// Setup cached references to methods where performance really counts
__getattr__ = lookup("__getattr__", false);
__setattr__ = lookup("__setattr__", false);
__delattr__ = lookup("__delattr__", false);
__tojava__ = lookup("__tojava__", false);
__del__ = lookup("__del__", false);
__contains__ = lookup("__contains__", false);
}
protected void findModule(PyObject dict) {
PyObject module = dict.__finditem__("__module__");
if (module == null || module == Py.None) {
// System.out.println("in PyClass getFrame: "+__name__.string);
PyFrame f = Py.getFrame();
if (f != null) {
PyObject nm = f.f_globals.__finditem__("__name__");
if (nm != null) {
dict.__setitem__("__module__", nm);
}
}
}
}
public Object __tojava__(Class c) {
if ((c == Object.class || c == Class.class || c == Serializable.class)
&& proxyClass != null) {
return proxyClass;
}
return super.__tojava__(c);
}
// returns [PyObject, PyClass]
PyObject[] lookupGivingClass(String name, boolean stop_at_java) {
PyObject result = __dict__.__finditem__(name);
PyClass resolvedClass = this;
if (result == null && __bases__ != null) {
int n = __bases__.__len__();
for (int i = 0; i < n; i++) {
resolvedClass = (PyClass) (__bases__.__getitem__(i));
PyObject[] res = resolvedClass.lookupGivingClass(name,
stop_at_java);
if (res[0] != null) {
return res;
}
}
}
return new PyObject[] { result, resolvedClass };
}
public PyObject fastGetDict() {
return __dict__;
}
PyObject lookup(String name, boolean stop_at_java) {
PyObject[] result = lookupGivingClass(name, stop_at_java);
return result[0];
}
public PyObject __findattr__(String name) {
if (name == "__dict__") {
return __dict__;
}
if (name == "__name__") {
return new PyString(__name__);
}
if (name == "__bases__") {
return __bases__;
}
PyObject[] result = lookupGivingClass(name, false);
if (result[0] == null) {
return super.__findattr__(name);
}
// xxx do we need to use result[1] (wherefound) for java cases for backw
// comp?
return result[0].__get__(null, this);
}
public void __setattr__(String name, PyObject value) {
if (name == "__dict__") {
if (!value.isMappingType())
throw Py.TypeError("__dict__ must be a dictionary object");
__dict__ = value;
return;
}
if (name == "__name__") {
if (!(value instanceof PyString)) {
throw Py.TypeError("__name__ must be a string object");
}
__name__ = value.toString();
return;
}
if (name == "__bases__") {
if (!(value instanceof PyTuple)) {
throw Py.TypeError("__bases__ must be a tuple object");
}
__bases__ = (PyTuple) value;
return;
}
__dict__.__setitem__(name, value);
}
public void __delattr__(String name) {
__dict__.__delitem__(name);
}
public void __rawdir__(PyDictionary accum) {
addKeys(accum, "__dict__");
PyObject[] bases = __bases__.getArray();
for (int i = 0; i < bases.length; i++) {
bases[i].__rawdir__(accum);
}
}
public PyObject __call__(PyObject[] args, String[] keywords) {
PyInstance inst;
if (__del__ == null) {
inst = new PyInstance(this);
} else {
// the class defined an __del__ method
inst = new PyFinalizableInstance(this);
}
inst.__init__(args, keywords);
// xxx this cannot happen anymore
/*
* if (proxyClass != null &&
* PyObject.class.isAssignableFrom(proxyClass)) { // It would be better
* if we didn't have to create a PyInstance // in the first place.
* ((PyObject)inst.javaProxy).__class__ = this; return
* (PyObject)inst.javaProxy; }
*/
return inst;
}
/* PyClass's are compared based on __name__ */
public int __cmp__(PyObject other) {
if (!(other instanceof PyClass)) {
return -2;
}
int c = __name__.compareTo(((PyClass) other).__name__);
return c < 0 ? -1 : c > 0 ? 1 : 0;
}
public PyString __str__() {
// Current CPython standard is that str(class) prints as
// module.class. If the class has no module, then just the class
// name is printed.
if (__dict__ == null) {
return new PyString(__name__);
}
PyObject mod = __dict__.__finditem__("__module__");
if (mod == null || !(mod instanceof PyString)) {
return new PyString(__name__);
}
String smod = ((PyString) mod).toString();
return new PyString(smod + "." + __name__);
}
public String toString() {
PyObject mod = __dict__.__finditem__("__module__");
String smod;
if (mod == null || !(mod instanceof PyString)) {
smod = "";
} else {
smod = ((PyString) mod).toString();
}
return "";
}
public boolean isSubClass(PyClass superclass) {
if (this == superclass) {
return true;
}
if (getProxyClass() != null && superclass.getProxyClass() != null) {
if (superclass.proxyClass.isAssignableFrom(this.proxyClass)) {
return true;
}
}
if (this.__bases__ == null || superclass.__bases__ == null) {
return false;
}
PyObject[] bases = this.__bases__.getArray();
int n = bases.length;
for (int i = 0; i < n; i++) {
PyClass c = (PyClass) bases[i];
if (c.isSubClass(superclass)) {
return true;
}
}
return false;
}
/**
* @see org.python.core.PyObject#safeRepr()
*/
public String safeRepr() throws PyIgnoreMethodTag {
return "class '" + __name__ + "'";
}
}
