Source Code Cross Referenced for PyGetSetDescr.java in  » Testing » Marathon » org » python » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        package org.python.core;
002:
003:        import java.lang.reflect.InvocationTargetException;
004:        import java.lang.reflect.Method;
005:        import java.lang.reflect.Modifier;
006:
007:        public class PyGetSetDescr extends PyDescriptor {
008:
009:            private Method get_meth;
010:
011:            private Method set_meth;
012:
013:            private Method del_meth;
014:
015:            private Class getset_type;
016:
017:            public PyGetSetDescr(PyType dtype, String name, Class c,
018:                    String get, String set) {
019:                this (dtype, name, c, get, set, null);
020:            }
021:
022:            public PyGetSetDescr(String name, Class c, String get, String set) {
023:                this (PyType.fromClass(c), name, c, get, set, null);
024:            }
025:
026:            public PyGetSetDescr(PyType dtype, String name, Class c,
027:                    String get, String set, String del) {
028:                this .name = name;
029:                this .dtype = dtype;
030:                try {
031:                    get_meth = c.getMethod(get, new Class[] {});
032:                } catch (NoSuchMethodException e) {
033:                    throw Py.SystemError("method " + get + " doesn't exist: "
034:                            + c.getName());
035:                }
036:                if (Modifier.isStatic(get_meth.getModifiers()))
037:                    throw Py.SystemError("static " + get + " not supported: "
038:                            + c.getName());
039:                getset_type = get_meth.getReturnType();
040:                if (set != null) {
041:                    try {
042:                        set_meth = c
043:                                .getMethod(set, new Class[] { getset_type });
044:                    } catch (NoSuchMethodException e) {
045:                        throw Py.SystemError("method " + set
046:                                + " doesn't exist: " + c.getName());
047:                    }
048:                    if (Modifier.isStatic(set_meth.getModifiers()))
049:                        throw Py.SystemError("static " + set
050:                                + " not supported: " + c.getName());
051:                }
052:                if (del != null) {
053:                    try {
054:                        del_meth = c.getMethod(del, new Class[] {});
055:                    } catch (NoSuchMethodException e) {
056:                        throw Py.SystemError("method " + set
057:                                + " doesn't exist: " + c.getName());
058:                    }
059:                    if (Modifier.isStatic(del_meth.getModifiers()))
060:                        throw Py.SystemError("static " + del
061:                                + " not supported: " + c.getName());
062:                }
063:            }
064:
065:            public PyGetSetDescr(String name, Class c, String get, String set,
066:                    String del) {
067:                this (PyType.fromClass(c), name, c, get, set, del);
068:            }
069:
070:            public String toString() {
071:                return "<attribute '" + name + "' of '" + dtype.fastGetName()
072:                        + "' objects>";
073:            }
074:
075:            /**
076:             * @see org.python.core.PyObject#__get__(org.python.core.PyObject,
077:             *      org.python.core.PyObject)
078:             */
079:            public PyObject __get__(PyObject obj, PyObject type) {
080:                try {
081:                    if (obj != null) {
082:                        PyType objtype = obj.getType();
083:                        if (objtype != dtype && !objtype.isSubType(dtype))
084:                            throw get_wrongtype(objtype);
085:                        Object v = get_meth.invoke(obj, new Object[0]);
086:                        if (v == null) {
087:                            obj.noAttributeError(name);
088:                        }
089:                        return Py.java2py(v);
090:                    }
091:                    return this ;
092:                } catch (IllegalArgumentException e) {
093:                    throw Py.JavaError(e);
094:                } catch (IllegalAccessException e) {
095:                    throw Py.JavaError(e); // unexpected
096:                } catch (InvocationTargetException e) {
097:                    throw Py.JavaError(e);
098:                }
099:            }
100:
101:            /**
102:             * @see org.python.core.PyObject#__set__(org.python.core.PyObject,
103:             *      org.python.core.PyObject)
104:             */
105:            public void __set__(PyObject obj, PyObject value) {
106:                try {
107:                    // obj != null
108:                    PyType objtype = obj.getType();
109:                    if (objtype != dtype && !objtype.isSubType(dtype))
110:                        throw get_wrongtype(objtype);
111:                    Object converted = value.__tojava__(getset_type);
112:                    if (converted == Py.NoConversion) {
113:                        throw Py.TypeError(""); // xxx
114:                    }
115:                    set_meth.invoke(obj, new Object[] { converted });
116:                } catch (IllegalArgumentException e) {
117:                    throw Py.JavaError(e);
118:                } catch (IllegalAccessException e) {
119:                    throw Py.JavaError(e); // unexpected
120:                } catch (InvocationTargetException e) {
121:                    throw Py.JavaError(e);
122:                }
123:            }
124:
125:            public void __delete__(PyObject obj) {
126:                try {
127:                    if (obj != null) {
128:                        PyType objtype = obj.getType();
129:                        if (objtype != dtype && !objtype.isSubType(dtype))
130:                            throw get_wrongtype(objtype);
131:                        del_meth.invoke(obj, new Object[0]);
132:                    }
133:                } catch (IllegalArgumentException e) {
134:                    throw Py.JavaError(e);
135:                } catch (IllegalAccessException e) {
136:                    throw Py.JavaError(e); // unexpected
137:                } catch (InvocationTargetException e) {
138:                    throw Py.JavaError(e);
139:                }
140:            }
141:
142:            /**
143:             * @see org.python.core.PyObject#implementsDescrSet()
144:             */
145:            public boolean implements DescrSet() {
146:                return set_meth != null;
147:            }
148:
149:            public boolean implements DescrDelete() {
150:                return del_meth != null;
151:            }
152:
153:            /**
154:             * @see org.python.core.PyObject#isDataDescr()
155:             */
156:            public boolean isDataDescr() {
157:                return true;
158:            }
159:
160:        }
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