Examples of org.apache.velocity.app.VelocityEngine.evaluate()

Class org.apache.velocity.app.VelocityEngine

Examples of org.apache.velocity.app.VelocityEngine.evaluate()

org.apache.velocity.app.VelocityEngine.evaluate()
renders the input string using the context into the output writer. To be used when a template is dynamically constructed, or want to use Velocity as a token replacer. @param context context to use in rendering input string @param out Writer in which to render the output @param logTag string to be used as the template name for log messages in case of error @param instring input string containing the VTL to be rendered @return true if successful, false otherwise. If false, seeVelocity runtime log

         *  this should parse fine -> uses ==
         */


        String template = "#if($a == $b) foo #end";


        ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);


        /*
         *  this should throw an exception
         */

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        template = "#if($a = $b) foo #end";


        try
        {
            ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);
            fail("Could evaluate template with errors!");
        }
        catch(ParseErrorException pe)
        {
            // Do nothing

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         * this should work
         */


        String template = "#macro(foo) foo #end";


        ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);


         /*
         *  this should throw an exception
         */

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        template = "#macro($x) foo #end";


        try
        {
            ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);
            fail("Could evaluate macro with errors!");
        }
        catch(ParseErrorException pe)
        {
            // Do nothing

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         * this should work
         */


        String template = "#macro(foo) foo #end";


        ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);


         /*
         *  this should work - spaces intentional
         */

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         *  this should work - spaces intentional
         */


        template = "#foreach(  $i     in  $woogie   ) end #end";


        ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);


        /*
        *  this should bomb
        */

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       template = "#macro(   foo $a) $a #end #foo(woogie)";


        try
        {
            ve.evaluate(new VelocityContext(), new StringWriter(), "foo", template);
            fail("Evaluation of macro with errors succeeded!");
        }
        catch(ParseErrorException pe)
        {
            // Do nothing

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        ToStringCounter counter = new ToStringCounter();
        Map m = new HashMap();
        m.put("counter", counter);


        ve.evaluate(new VelocityContext(m), new StringWriter(), "foo", template);


        assertEquals(1, counter.timesCalled);
    }


    public static class ToStringCounter {

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        Writer writer = new StringWriter();
        
        try 
        {
            ve.evaluate(context,writer,"test","   #set($abc)   ");     
            fail("Should have thown a ParseErrorException");
        } 
        catch (ParseErrorException e) 
        {
            assertEquals("test",e.getTemplateName());

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        Writer writer = new StringWriter();
        
        try 
        {
            ve.evaluate(context,writer,"testMacro","#macro($blarg) foo #end");     
            fail("Should have thown a ParseErrorException");
        } 
        catch (ParseErrorException e) 
        {
            assertEquals("testMacro",e.getTemplateName());

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