Source Code Cross Referenced for PyReflectedFunction.java in  » Scripting » jython » org » python » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » jython » org.python.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // Copyright (c) Corporation for National Research Initiatives
002:        package org.python.core;
003:
004:        import java.lang.reflect.Method;
005:        import java.lang.reflect.Modifier;
006:        import java.util.Enumeration;
007:        import java.util.Hashtable;
008:
009:        public class PyReflectedFunction extends PyObject {
010:            public String __name__;
011:            public PyObject __doc__ = Py.None;
012:            public ReflectedArgs[] argslist;
013:            public int nargs;
014:
015:            public PyReflectedFunction(String name) {
016:                __name__ = name;
017:                argslist = new ReflectedArgs[1];
018:                nargs = 0;
019:            }
020:
021:            public PyReflectedFunction(Method method) {
022:                this (method.getName());
023:                addMethod(method);
024:            }
025:
026:            public PyObject _doget(PyObject container) {
027:                return _doget(container, null);
028:            }
029:
030:            public PyObject _doget(PyObject container, PyObject wherefound) {
031:                if (container == null)
032:                    return this ;
033:                return new PyMethod(container, this , wherefound);
034:            }
035:
036:            public boolean _doset(PyObject container) {
037:                throw Py.TypeError("java function not settable: " + __name__);
038:            }
039:
040:            private ReflectedArgs makeArgs(Method m) {
041:                return new ReflectedArgs(m, m.getParameterTypes(), m
042:                        .getDeclaringClass(), Modifier.isStatic(m
043:                        .getModifiers()));
044:            }
045:
046:            public PyReflectedFunction copy() {
047:                PyReflectedFunction func = new PyReflectedFunction(__name__);
048:                func.__doc__ = __doc__;
049:                func.nargs = nargs;
050:                func.argslist = new ReflectedArgs[nargs];
051:                System.arraycopy(argslist, 0, func.argslist, 0, nargs);
052:                return func;
053:            }
054:
055:            public boolean handles(Method method) {
056:                return handles(makeArgs(method));
057:            }
058:
059:            protected boolean handles(ReflectedArgs args) {
060:                ReflectedArgs[] argsl = argslist;
061:                int n = nargs;
062:                for (int i = 0; i < n; i++) {
063:                    int cmp = args.compareTo(argsl[i]);
064:                    if (cmp == 0)
065:                        return true;
066:                    if (cmp == +1)
067:                        return false;
068:                }
069:                return false;
070:            }
071:
072:            public void addMethod(Method m) {
073:                int mods = m.getModifiers();
074:                // Only add public methods unless we're overriding
075:                if (!Modifier.isPublic(mods)
076:                        && !JavaAccessibility.accessIsMutable())
077:                    return;
078:                addArgs(makeArgs(m));
079:            }
080:
081:            protected void addArgs(ReflectedArgs args) {
082:                ReflectedArgs[] argsl = argslist;
083:                int n = nargs;
084:                int i;
085:                for (i = 0; i < n; i++) {
086:                    int cmp = args.compareTo(argsl[i]);
087:                    if (cmp == 0)
088:                        return;
089:                    if (cmp == ReflectedArgs.REPLACE) {
090:                        argsl[i] = args;
091:                        return;
092:                    }
093:                    if (cmp == -1)
094:                        break;
095:                }
096:
097:                int nn = n + 1;
098:                if (nn > argsl.length) {
099:                    argsl = new ReflectedArgs[nn + 2];
100:                    System.arraycopy(argslist, 0, argsl, 0, n);
101:                    argslist = argsl;
102:                }
103:
104:                for (int j = n; j > i; j--) {
105:                    argsl[j] = argsl[j - 1];
106:                }
107:
108:                argsl[i] = args;
109:                nargs = nn;
110:            }
111:
112:            public PyObject __call__(PyObject self, PyObject[] args,
113:                    String[] keywords) {
114:                ReflectedCallData callData = new ReflectedCallData();
115:                Object method = null;
116:
117:                ReflectedArgs[] argsl = argslist;
118:                int n = nargs;
119:                for (int i = 0; i < n; i++) {
120:                    ReflectedArgs rargs = argsl[i];
121:                    //System.err.println(rargs.toString());
122:                    if (rargs.matches(self, args, keywords, callData)) {
123:                        method = rargs.data;
124:                        break;
125:                    }
126:                }
127:                if (method == null) {
128:                    throwError(callData.errArg, args.length, self != null,
129:                            keywords.length != 0);
130:                }
131:
132:                Object cself = callData.self;
133:                Method m = (Method) method;
134:                // Check to see if we should be using a super__ method instead
135:                // This is probably a bit inefficient...
136:                if (self == null && cself != null && cself instanceof  PyProxy
137:                        && !__name__.startsWith("super__")) {
138:                    PyInstance iself = ((PyProxy) cself)._getPyInstance();
139:                    if (argslist[0].declaringClass != iself.instclass.proxyClass) {
140:                        String mname = ("super__" + __name__);
141:                        // xxx experimental
142:                        Method[] super __methods = (Method[]) iself.instclass.super __methods
143:                                .get(mname);
144:                        if (super __methods != null) {
145:                            Class[] msig = m.getParameterTypes();
146:                            for (int i = 0; i < super __methods.length; i++) {
147:                                if (java.util.Arrays.equals(msig,
148:                                        super __methods[i].getParameterTypes())) {
149:                                    m = super __methods[i];
150:                                    break;
151:                                }
152:                            }
153:                        }
154:                        /* xxx this way it is slow!
155:                        Method super_method = null;
156:                        try {
157:                            super_method = cself.getClass().getMethod(mname,m.getParameterTypes());
158:                        } catch(NoSuchMethodException e) { // ??? more stuff to ignore?
159:                        }
160:                        if (super_method != null) {
161:                            m = super_method;
162:                        }*/
163:                        /* xxx original              
164:                        PyJavaClass jc = PyJavaClass.lookup(iself.__class__.proxyClass);
165:                        PyObject super__ = jc.__findattr__(mname.intern());
166:                        if (super__ != null) {
167:                            return super__.__call__(self, args, keywords);
168:                        }*/
169:                    }
170:                }
171:                try {
172:
173:                    Object o = m.invoke(cself, callData.getArgsArray());
174:                    return Py.java2py(o);
175:                } catch (Throwable t) {
176:                    throw Py.JavaError(t);
177:                }
178:            }
179:
180:            public PyObject __call__(PyObject[] args, String[] keywords) {
181:                return __call__(null, args, keywords);
182:            }
183:
184:            // A bunch of code to make error handling prettier
185:
186:            protected void throwError(String message) {
187:                throw Py.TypeError(__name__ + "(): " + message);
188:            }
189:
190:            private static void addRange(StringBuffer buf, int min, int max,
191:                    String sep) {
192:                if (buf.length() > 0) {
193:                    buf.append(sep);
194:                }
195:                if (min < max) {
196:                    buf.append(Integer.toString(min) + "-" + max);
197:                } else {
198:                    buf.append(min);
199:                }
200:            }
201:
202:            protected void throwArgCountError(int nArgs, boolean self) {
203:                // Assume no argument lengths greater than 40...
204:                boolean[] legalArgs = new boolean[40];
205:                int maxArgs = -1;
206:                int minArgs = 40;
207:
208:                ReflectedArgs[] argsl = argslist;
209:                int n = nargs;
210:                for (int i = 0; i < n; i++) {
211:                    ReflectedArgs rargs = argsl[i];
212:
213:                    int l = rargs.args.length;
214:                    if (!self && !rargs.isStatic) {
215:                        l += 1;
216:                    }
217:
218:                    legalArgs[l] = true;
219:                    if (l > maxArgs)
220:                        maxArgs = l;
221:                    if (l < minArgs)
222:                        minArgs = l;
223:                }
224:
225:                StringBuffer buf = new StringBuffer();
226:
227:                int startRange = minArgs;
228:                int a = minArgs + 1;
229:                while (a < maxArgs) {
230:                    if (legalArgs[a]) {
231:                        a++;
232:                        continue;
233:                    } else {
234:                        addRange(buf, startRange, a - 1, ", ");
235:                        a++;
236:                        while (a <= maxArgs) {
237:                            if (legalArgs[a]) {
238:                                startRange = a;
239:                                break;
240:                            }
241:                            a++;
242:                        }
243:                    }
244:                }
245:                addRange(buf, startRange, maxArgs, " or ");
246:                throwError("expected " + buf + " args; got " + nArgs);
247:            }
248:
249:            private static String ordinal(int n) {
250:                switch (n + 1) {
251:                case 0:
252:                    return "self";
253:                case 1:
254:                    return "1st";
255:                case 2:
256:                    return "2nd";
257:                case 3:
258:                    return "3rd";
259:                default:
260:                    return Integer.toString(n + 1) + "th";
261:                }
262:            }
263:
264:            private static String niceName(Class arg) {
265:                if (arg == String.class || arg == PyString.class) {
266:                    return "String";
267:                }
268:                if (arg.isArray()) {
269:                    return niceName(arg.getComponentType()) + "[]";
270:                }
271:                return arg.getName();
272:            }
273:
274:            protected void throwBadArgError(int errArg, int nArgs, boolean self) {
275:                Hashtable table = new Hashtable();
276:                ReflectedArgs[] argsl = argslist;
277:                int n = nargs;
278:                for (int i = 0; i < n; i++) {
279:                    ReflectedArgs rargs = argsl[i];
280:                    Class[] args = rargs.args;
281:                    int len = args.length;
282:                    /*if (!args.isStatic && !self) {
283:                      len = len-1;
284:                      }*/
285:                    // This check works almost all the time.
286:                    // I'm still a little worried about non-static methods
287:                    // called with an explict self...
288:                    if (len == nArgs) {
289:                        if (errArg == -1) {
290:                            table.put(rargs.declaringClass,
291:                                    rargs.declaringClass);
292:                        } else {
293:                            table.put(args[errArg], args[errArg]);
294:                        }
295:                    }
296:                }
297:
298:                StringBuffer buf = new StringBuffer();
299:                Enumeration keys = table.keys();
300:                while (keys.hasMoreElements()) {
301:                    Class arg = (Class) keys.nextElement();
302:                    String name = niceName(arg);
303:                    if (keys.hasMoreElements()) {
304:                        buf.append(name);
305:                        buf.append(", ");
306:                    } else {
307:                        if (buf.length() > 2) {
308:                            buf.setLength(buf.length() - 2);
309:                            buf.append(" or ");
310:                        }
311:                        buf.append(name);
312:                    }
313:                }
314:
315:                throwError(ordinal(errArg) + " arg can't be coerced to " + buf);
316:            }
317:
318:            protected void throwError(int errArg, int nArgs, boolean self,
319:                    boolean keywords) {
320:                if (keywords)
321:                    throwError("takes no keyword arguments");
322:
323:                if (errArg == -2) {
324:                    throwArgCountError(nArgs, self);
325:                }
326:
327:                /*if (errArg == -1) {
328:                  throwBadArgError(-1);
329:                  throwError("bad self argument");
330:                  // Bad declared class
331:                  }*/
332:
333:                throwBadArgError(errArg, nArgs, self);
334:            }
335:
336:            // Included only for debugging purposes...
337:            public void printArgs() {
338:                System.err.println("nargs: " + nargs);
339:                for (int i = 0; i < nargs; i++) {
340:                    ReflectedArgs args = argslist[i];
341:                    System.err.println(args.toString());
342:                }
343:            }
344:
345:            public String toString() {
346:                //printArgs();
347:                return "<java function " + __name__ + " " + Py.idstr(this )
348:                        + ">";
349:            }
350:        }
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