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/*
  * (non-Javadoc)
  *
  * @see ygfmis.fw.system.scripting.ScriptEvaluator#evaluateExpression(java.lang.String,
  *      java.util.Map, java.lang.Class)
  */
 public Object evaluateExpression(String expr) {
  initJavaScriptContext();
  java.lang.Object eval;
  try {
   if (log.isDebugEnabled()) {
    log.debug("Evaluating javascript expression:" + expr);
   }
   eval = conext.evaluateString(scope, expr, "", 1, null);
   if (log.isDebugEnabled()) {
    log.debug("JavaScriptEvaluator->Javascript expression " + expr
      + " is evaluated to " + eval);
   }
   return eval;
  } catch (Exception jse) {
   if (log.isErrorEnabled()) {
    log.error("JavaScriptEvaluator -> The result of expression "
      + expr + " can't be evaluated - error message="
      + jse.getMessage(), jse);
   }
   throw new ScriptException("Result cannot be evaluated", jse);
  } finally {
   //org.mozilla.javascript.Context.exit();
  }
 }
 
 private static org.mozilla.javascript.Context conext = null;
 
 private static Scriptable scope = null;
 
 /**
  * YGFMISWebµÄµØÖ·.
  */
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