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1
55
56 package org.apache.bsf.engines.jython;
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
75
76 public class JythonEngine extends BSFEngineImpl {
77 PythonInterpreter interp;
78
79
82 public Object call (Object object, String method, Object [] args)
83 throws BSFException {
84
85 PyObject[] pyargs = Py.EmptyObjects;
86 if (args != null) {
87 pyargs = new PyObject[args.length];
88 for (int i = 0; i < pyargs.length; i++)
89 pyargs[i] = Py.java2py(args[i]);
90 }
91
92 if (object != null) {
93 PyObject o = Py.java2py(object);
94 return unwrap(o.invoke(method, pyargs));
95 }
96 PyObject m = interp.get(method);
97 if (m == null)
98 m = interp.eval(method);
99 if (m != null) {
100 return unwrap(m.__call__(pyargs));
101 }
102 return null;
103 }
104
107 public void declareBean (BSFDeclaredBean bean) throws BSFException {
108 interp.set (bean.name, bean.bean);
109 }
110
113 public Object eval (String source, int lineNo, int columnNo,
114 Object script) throws BSFException {
115 try {
116 Object result = interp.eval (script.toString ());
117 if (result != null && result instanceof PyJavaInstance)
118 result = ((PyJavaInstance)result).__tojava__(Object .class);
119 return result;
120 } catch (PyException e) {
121 e.printStackTrace ();
122 throw new BSFException (BSFException.REASON_EXECUTION_ERROR,
123 "exception from Jython: " + e, e);
124 }
125 }
126
129 public void exec (String source, int lineNo, int columnNo,
130 Object script) throws BSFException {
131 try {
132 interp.exec (script.toString ());
133 } catch (PyException e) {
134 e.printStackTrace ();
135 throw new BSFException (BSFException.REASON_EXECUTION_ERROR,
136 "exception from Jython: " + e, e);
137 }
138 }
139
142 public void initialize (BSFManager mgr, String lang,
143 Vector declaredBeans) throws BSFException {
144 super.initialize (mgr, lang, declaredBeans);
145
146 interp = new PythonInterpreter ();
148
149 interp.set ("bsf", new BSFFunctions (mgr, this));
151
152 int size = declaredBeans.size ();
153 for (int i = 0; i < size; i++) {
154 declareBean ((BSFDeclaredBean) declaredBeans.elementAt (i));
155 }
156 }
157
158
161 public void undeclareBean (BSFDeclaredBean bean) throws BSFException {
162 interp.set (bean.name, null);
163 }
164 public Object unwrap(PyObject result) {
165 if (result != null) {
166 Object ret = result.__tojava__(Object .class);
167 if (ret != Py.NoConversion)
168 return ret;
169 }
170 return result;
171 }
172 }
173 |
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