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1
55
56 package org.apache.bsf.engines.jpython;
57
58 import java.util.Vector  ;
59
60 import org.python.util.*;
61 import org.python.core.*;
62
63 import org.apache.bsf.*;
64 import org.apache.bsf.util.BSFEngineImpl;
65 import org.apache.bsf.util.BSFFunctions;
66
67
73
74 public class JPythonEngine extends BSFEngineImpl {
75 PythonInterpreter interp;
76
77
80 public Object call (Object object, String method, Object [] args)
81 throws BSFException {
82
83 PyObject[] pyargs = Py.EmptyObjects;
84 if (args != null) {
85 pyargs = new PyObject[args.length];
86 for (int i = 0; i < pyargs.length; i++)
87 pyargs[i] = Py.java2py(args[i]);
88 }
89
90 if (object != null) {
91 PyObject o = Py.java2py(object);
92 return unwrap(o.invoke(method, pyargs));
93 }
94 PyObject m = interp.get(method);
95 if (m == null)
96 m = interp.eval(method);
97 if (m != null) {
98 return unwrap(m.__call__(pyargs));
99 }
100 return null;
101 }
102
105 public void declareBean (BSFDeclaredBean bean) throws BSFException {
106 interp.set (bean.name, bean.bean);
107 }
108
111 public Object eval (String source, int lineNo, int columnNo,
112 Object script) throws BSFException {
113 try {
114 Object result = interp.eval (script.toString ());
115 if (result != null && result instanceof PyJavaInstance)
116 result = ((PyJavaInstance)result).__tojava__(Object .class);
117 return result;
118 } catch (PyException e) {
119 e.printStackTrace ();
120 throw new BSFException (BSFException.REASON_EXECUTION_ERROR,
121 "exception from JPython: " + e, e);
122 }
123 }
124
127 public void exec (String source, int lineNo, int columnNo,
128 Object script) throws BSFException {
129 try {
130 interp.exec (script.toString ());
131 } catch (PyException e) {
132 e.printStackTrace ();
133 throw new BSFException (BSFException.REASON_EXECUTION_ERROR,
134 "exception from JPython: " + e, e);
135 }
136 }
137
140 public void initialize (BSFManager mgr, String lang,
141 Vector declaredBeans) throws BSFException {
142 super.initialize (mgr, lang, declaredBeans);
143
144 interp = new PythonInterpreter ();
146
147 interp.set ("bsf", new BSFFunctions (mgr, this));
149
150 int size = declaredBeans.size ();
151 for (int i = 0; i < size; i++) {
152 declareBean ((BSFDeclaredBean) declaredBeans.elementAt (i));
153 }
154 }
155
156
159 public void undeclareBean (BSFDeclaredBean bean) throws BSFException {
160 interp.set (bean.name, null);
161 }
162 public Object unwrap(PyObject result) {
163 if (result != null) {
164 Object ret = result.__tojava__(Object .class);
165 if (ret != Py.NoConversion)
166 return ret;
167 }
168 return result;
169 }
170 }
171 |
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