Examples of groovy.text.GStringTemplateEngine

groovy.text.GStringTemplateEngine
Processes template source files substituting variables and expressions into placeholders in a template source text to produce the desired output using a streaming approach. This engine has equivalent functionality to the {@link SimpleTemplateEngine} but creates the template using writableclosures making it potentially more scalable for large templates or in streaming scenarios.
The template engine uses JSP style <% %> script and <%= %> expression syntax or GString style expressions. The variable 'out' is bound to the writer that the template is being written to.
Frequently, the template source will be in a file but here is a simple example providing the template as a string:
```
 def binding = [ firstname : "Grace", lastname  : "Hopper", accepted  : true, title     : 'Groovy for COBOL programmers' ] def engine = new groovy.text.GStringTemplateEngine() def text = '''\ Dear <%= firstname %> $lastname, We <% if (accepted) print 'are pleased' else print 'regret' %> \ to inform you that your paper entitled '$title' was ${ accepted ? 'accepted' : 'rejected' }. The conference committee. ''' def template = engine.createTemplate(text).make(binding) println template.toString() 
```
This example uses a mix of the JSP style and GString style placeholders but you can typically use just one style if you wish. Running this example will produce this output:
```
 Dear Grace Hopper, We are pleased to inform you that your paper entitled 'Groovy for COBOL programmers' was accepted. The conference committee. 
```
The template engine can also be used as the engine for {@link groovy.servlet.TemplateServlet} by placing thefollowing in your web.xml file (plus a corresponding servlet-mapping element):
```
 <servlet> <servlet-name>GStringTemplate</servlet-name> <servlet-class>groovy.servlet.TemplateServlet</servlet-class> <init-param> <param-name>template.engine</param-name> <param-value>groovy.text.GStringTemplateEngine</param-value> </init-param> </servlet> 
```
In this case, your template source file should be HTML with the appropriate embedded placeholders. @author tug@wilson.co.uk @author Paul King


    private TemplateEngine templateEngine;


    public GSPScriptEngine(ScriptEngineFactory scriptEngineFactory, ClassLoader classLoader) {
        super(scriptEngineFactory);
        this.templateEngine = new GStringTemplateEngine(classLoader);
    }

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        this.envVars = new HashMap(envVars);
        this.envVars.remove("PATH");
    }


    public Map getConfig() {
        GStringTemplateEngine engine = new GStringTemplateEngine();
        String yaml = null;


        try {
            yaml = engine.createTemplate(config).make(new MissingPropForwardingMap(envVars)).toString();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return (Map) new Yaml().load(yaml);
    }

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        this.packageTemplatePaths = Arrays.asList(packageTemplates);
        this.classTemplatePaths = Arrays.asList(classTemplates);
        this.docTemplates = new HashMap<String, Template>();
        this.packageTemplates = new HashMap<String, Template>();
        this.classTemplates = new HashMap<String, Template>();
        engine = new GStringTemplateEngine();


    }

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    this.packageTemplatePaths = Arrays.asList(packageTemplates);
    this.classTemplatePaths = Arrays.asList(classTemplates);
    this.docTemplates = new HashMap();
    this.packageTemplates = new HashMap();
    this.classTemplates = new HashMap();
    engine = new GStringTemplateEngine();
    
  }

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        this.packageTemplatePaths = Arrays.asList(packageTemplates);
        this.classTemplatePaths = Arrays.asList(classTemplates);
        this.docTemplates = new HashMap<String, Template>();
        this.packageTemplates = new HashMap<String, Template>();
        this.classTemplates = new HashMap<String, Template>();
        engine = new GStringTemplateEngine();


    }

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    return template(name, Collections.<String, Object> emptyMap());
  }


  public static String template(String name, Map<String, ?> model) throws IOException,
      CompilationFailedException, ClassNotFoundException {
    return template(new GStringTemplateEngine(), name, model);
  }

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