57 lines
1.6 KiB
Java
57 lines
1.6 KiB
Java
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package com.metaweb.gridworks.expr;
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import java.util.Enumeration;
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import java.util.Properties;
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import org.python.core.PyException;
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import org.python.core.PyString;
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import org.python.util.PythonInterpreter;
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public class JythonEvaluable implements Evaluable {
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private String _code;
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private static final String _functionName = "temp";
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private static PythonInterpreter _engine = new PythonInterpreter();
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public JythonEvaluable(String s) {
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// indent and create a function out of the code
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String[] lines = s.split("\r\n|\r|\n");
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StringBuilder function = new StringBuilder();
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function.append("def " + _functionName + "():");
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for (int i = 0; i < lines.length; i++) {
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function.append("\n " + lines[i]);
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}
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_code = function.toString();
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}
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public Object evaluate(Properties bindings) {
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try {
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for (Enumeration<Object> e = bindings.keys() ; e.hasMoreElements() ;) {
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Object k = e.nextElement();
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Object v = bindings.get(k);
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if (v instanceof HasFields) {
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_engine.set((String)k, new JythonHasFieldsWrapper((HasFields) v, bindings));
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} else {
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_engine.set((String) k, v);
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}
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}
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_engine.exec(_code);
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Object result = _engine.eval(_functionName + "()");
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// unwrap the underlying Java objects
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if (result instanceof JythonObjectWrapper) {
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result = ((JythonObjectWrapper) result)._obj;
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} else if (result instanceof JythonHasFieldsWrapper) {
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result = ((JythonHasFieldsWrapper) result)._obj;
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}
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return result;
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} catch (PyException e) {
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return new EvalError(e.toString());
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}
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}
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}
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