Source Code Cross Referenced for PyJavaPackage.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:        // Copyright 2000 Samuele Pedroni
003:
004:        package org.python.core;
005:
006:        import java.util.StringTokenizer;
007:
008:        /**
009:         * A representation of java package.
010:         */
011:
012:        public class PyJavaPackage extends PyObject {
013:            public String __name__;
014:
015:            public PyStringMap __dict__;
016:            //public String _unparsedAll;
017:            /** Its keys are the names of statically known classes.
018:             * E.g. from jars pre-scan.
019:             */
020:            public PyStringMap clsSet;
021:            public String __file__;
022:            //public PyList __all__;
023:
024:            /** (Control) package manager whose hierarchy contains this java pkg.
025:             */
026:            public PackageManager __mgr__;
027:
028:            public PyJavaPackage(String name) {
029:                this (name, null, null);
030:            }
031:
032:            public PyJavaPackage(String name, String jarfile) {
033:                this (name, null, jarfile);
034:            }
035:
036:            public PyJavaPackage(String name, PackageManager mgr) {
037:                this (name, mgr, null);
038:            }
039:
040:            public PyJavaPackage(String name, PackageManager mgr, String jarfile) {
041:                __file__ = jarfile;
042:                __name__ = name;
043:
044:                if (mgr == null)
045:                    __mgr__ = PySystemState.packageManager; // default
046:                else
047:                    __mgr__ = mgr;
048:
049:                clsSet = new PyStringMap();
050:
051:                __dict__ = new PyStringMap();
052:                __dict__.__setitem__("__name__", new PyString(__name__));
053:            }
054:
055:            public PyJavaPackage addPackage(String name) {
056:                return addPackage(name, null);
057:            }
058:
059:            public PyJavaPackage addPackage(String name, String jarfile) {
060:                int dot = name.indexOf('.');
061:                String firstName = name;
062:                String lastName = null;
063:                if (dot != -1) {
064:                    firstName = name.substring(0, dot);
065:                    lastName = name.substring(dot + 1, name.length());
066:                }
067:                firstName = firstName.intern();
068:                PyJavaPackage p = (PyJavaPackage) __dict__
069:                        .__finditem__(firstName);
070:                if (p == null) {
071:                    String pname = __name__.length() == 0 ? firstName
072:                            : __name__ + '.' + firstName;
073:                    p = new PyJavaPackage(pname, __mgr__, jarfile);
074:                    __dict__.__setitem__(firstName, p);
075:                } else {
076:                    // this code is ok here, because this is not needed for
077:                    // a top level package
078:                    if (jarfile == null || !jarfile.equals(p.__file__))
079:                        p.__file__ = null;
080:                }
081:                if (lastName != null)
082:                    return p.addPackage(lastName, jarfile);
083:                else
084:                    return p;
085:            }
086:
087:            public PyObject addClass(String name, Class c) {
088:                // xxx what to do with PyObject subclasses?
089:                //PyObject ret = PyJavaClass.lookup(c);  // xxx java2py?
090:                // perhaps introduce class2py
091:                PyObject ret = Py.java2py(c);
092:                __dict__.__setitem__(name.intern(), ret);
093:                return ret;
094:            }
095:
096:            public PyObject addLazyClass(String name) {
097:                // xxx what to do with PyObject subclasses? this now fails on them
098:                PyObject ret = PyJavaClass.lookup(__name__ + '.' + name,
099:                        __mgr__);
100:                __dict__.__setitem__(name.intern(), ret);
101:                return ret;
102:            }
103:
104:            /** Add statically known classes.
105:             * @param classes their names as comma-separated string
106:             */
107:            public void addPlaceholders(String classes) {
108:                StringTokenizer tok = new StringTokenizer(classes, ",@");
109:                while (tok.hasMoreTokens()) {
110:                    String p = tok.nextToken();
111:                    String name = p.trim().intern();
112:                    if (clsSet.__finditem__(name) == null)
113:                        clsSet.__setitem__(name, Py.One);
114:                }
115:            }
116:
117:            public PyObject __dir__() {
118:                return __mgr__.doDir(this , false, false);
119:            }
120:
121:            /**
122:             * Used for 'from xyz import *', dynamically dir pkg filling up __dict__.
123:             * It uses {@link PackageManager#doDir} implementation furnished by
124:             * the control package manager with instatiate true. The package
125:             * manager should lazily load classes with {@link #addLazyClass} in
126:             * the package.
127:             *
128:             * @return list of member names
129:             */
130:            public PyObject fillDir() {
131:                return __mgr__.doDir(this , true, false);
132:            }
133:
134:            public PyObject __findattr__(String name) {
135:
136:                PyObject ret = __dict__.__finditem__(name);
137:                if (ret != null)
138:                    return ret;
139:
140:                if (__mgr__.packageExists(__name__, name)) {
141:                    __mgr__.notifyPackageImport(__name__, name);
142:                    return addPackage(name);
143:                }
144:
145:                Class c = __mgr__.findClass(__name__, name);
146:                if (c != null)
147:                    return addClass(name, c);
148:
149:                if (name == "__name__")
150:                    return new PyString(__name__);
151:                if (name == "__dict__")
152:                    return __dict__;
153:                if (name == "__mgr__")
154:                    return Py.java2py(__mgr__);
155:                if (name == "__file__") {
156:                    if (__file__ != null)
157:                        return new PyString(__file__);
158:
159:                    return Py.None;
160:                }
161:
162:                return null;
163:            }
164:
165:            public void __setattr__(String attr, PyObject value) {
166:                if (attr == "__mgr__") {
167:                    PackageManager newMgr = (PackageManager) Py.tojava(value,
168:                            PackageManager.class);
169:                    if (newMgr == null) {
170:                        throw Py
171:                                .TypeError("cannot set java package __mgr__ to None");
172:                    }
173:                    __mgr__ = newMgr;
174:                    return;
175:                }
176:                if (attr == "__file__") {
177:                    __file__ = value.__str__().toString();
178:                    return;
179:                }
180:
181:                super .__setattr__(attr, value);
182:            }
183:
184:            public String toString() {
185:                return "<java package " + __name__ + " " + Py.idstr(this ) + ">";
186:            }
187:
188:            /**
189:             * @see org.python.core.PyObject#safeRepr()
190:             */
191:            public String safeRepr() throws PyIgnoreMethodTag {
192:                return "java package '" + __name__ + "'";
193:            }
194:
195:        }
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