Examples of org.apache.bsf.BSFManager.eval()

org.apache.bsf.BSFManager.eval()
Evaluate the given expression of the given language and return the resulting value. @param lang language identifier @param source (context info) the source of this expression(e.g., filename) @param lineNo (context info) the line number in source for expr @param columnNo (context info) the column number in source for expr @param expr the expression to evaluate @exception BSFException if anything goes wrong while running the script

    public void parsePackages()
    {
        BSFManager context = new BSFManager();
        try
        {
            context.eval("beanshell", "core", 0, 0, "double log1p(double d) { return Math.log1p(d); }");
            context.eval("beanshell", "core", 0, 0,
                         "double pow(double d, double p) { return Math.pow(d,p); }");


            for (ScriptDocument script : _scripts)
            {

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    {
        BSFManager context = new BSFManager();
        try
        {
            context.eval("beanshell", "core", 0, 0, "double log1p(double d) { return Math.log1p(d); }");
            context.eval("beanshell", "core", 0, 0,
                         "double pow(double d, double p) { return Math.pow(d,p); }");


            for (ScriptDocument script : _scripts)
            {
                parseScript(script, context);

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            catch (BSFException ex)
            {
                log.warn("Failed to register WebContext with scripting engine: " + ex.getMessage());
            }
            String languageToUse = language != null ? language : BSFManager.getLangFromFilename(scriptPath);
            return bsfman.eval(languageToUse, (null == scriptPath ? "dwr.xml" : scriptPath), 0, 0, getScript());
        }
        catch (Exception ex)
        {
            throw new IllegalArgumentException("Failed to getInstance", ex);
        }

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                    }
                }
            }


            // execute the script
            Object result = bsfManager.eval(scriptType, cacheName, 0, 0, scriptString);


            // check the result
            if (result != null && !(result instanceof String)) {
                throw new EventHandlerException("Event did not return a String result, it returned a " + result.getClass().getName());
            }

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                    }
                }                                                
            }                    
                                                                                     
            // execute the script
            Object result = bsfManager.eval(scriptType, cacheName, 0, 0, scriptString);
            
            // check the result
            if (result != null && !(result instanceof String)) {
                throw new EventHandlerException("Event did not return a String result, it returned a " + result.getClass().getName());           
            }

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        try {
            BSFManager m = createManager();
            declareBeans(m);
            // execute the script
            if (engine == null) {
                return m.eval(getLanguage(), execName, 0, 0, getScript());
            } else {
                return engine.eval(execName, 0, 0, getScript());
            }
        } catch (BSFException be) {
            throwBuildException(be);

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        expResult = "HELLO WORLD!";
        result = instance.eval("<script>", 0, 0, "message=\"Hello \" + \"World!\"\nmessage.upcase");
        assertEquals(expResult, result);


        manager.declareBean("greet", "Heeey", String.class);
        result = manager.eval("jruby", "<script>", 0, 0, "message=$greet + \" World!\"");
        expResult = "Heeey World!";
        assertEquals(expResult, result);
    }


    /**

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                  "q0 * Math.exp(1.0 / $h * Math.log(1.0/2.0) * t)\n" +
                "end\n" +
                "def years_to_amount(q0, q)\n" +
                  "$h * (Math.log(q) - Math.log(q0)) / Math.log(1.0/2.0)\n" +
                "end";
        recv = manager.eval("jruby", "radioactive_decay", 0, 0, script);
        method = "amount_after_years";
        args = new Object[2];
        args[0] = 10.0; args[1] = 1000;
        
        // Radium

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    //@Test
    public void testLVar() throws BSFException {
        BSFManager.registerScriptingEngine("jruby",
                "org.jruby.embed.bsf.JRubyEngine", new String[]{"rb"});
        BSFManager bsf = new BSFManager();
        bsf.eval("jruby", "(java)", 1, 1, "$x='GVar'");
        bsf.eval("jruby", "(java)", 1, 1, "@gvar = \"$x = #{$x}\"");


        bsf.eval("jruby", "(java)", 1, 1, "x='LVar'");
        bsf.eval("jruby", "(java)", 1, 1, "at_exit { @result =  \"#{x} and #{$x} in an at_exit block\" }");
        Object ret = bsf.eval("jruby", "(java)", 1, 1, "@lvar = \"x = #{x}\";return @gvar, @lvar");

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    public void testLVar() throws BSFException {
        BSFManager.registerScriptingEngine("jruby",
                "org.jruby.embed.bsf.JRubyEngine", new String[]{"rb"});
        BSFManager bsf = new BSFManager();
        bsf.eval("jruby", "(java)", 1, 1, "$x='GVar'");
        bsf.eval("jruby", "(java)", 1, 1, "@gvar = \"$x = #{$x}\"");


        bsf.eval("jruby", "(java)", 1, 1, "x='LVar'");
        bsf.eval("jruby", "(java)", 1, 1, "at_exit { @result =  \"#{x} and #{$x} in an at_exit block\" }");
        Object ret = bsf.eval("jruby", "(java)", 1, 1, "@lvar = \"x = #{x}\";return @gvar, @lvar");
        List<String> expResult = Arrays.asList("$x = GVar", "x = LVar");

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