public String doMapping()

in src/java/org/apache/turbine/services/template/mapper/LayoutTemplateMapper.java [75:166]
61 lines of code
9 McCabe index (conditional complexity)

    public String doMapping(String template)
    {
        log.debug("doMapping({})", template);
        // Copy our elements into an array
        List<String> components
            = new ArrayList<>(Arrays.asList(StringUtils.split(
                                              template,
                                              String.valueOf(TemplateService.TEMPLATE_PARTS_SEPARATOR))));
        int componentSize = components.size() - 1 ;

        // This method never gets an empty string passed.
        // So this is never < 0
        String templateName = components.get(componentSize);
        components.remove(componentSize--);

        log.debug("templateName is {}", templateName);

        // Last element decides, which template Service to use...
        TemplateService templateService = (TemplateService)TurbineServices.getInstance().getService(TemplateService.SERVICE_NAME);
        TemplateEngineService tes = templateService.getTemplateEngineService(templateName);

        if (tes == null)
        {
            return null;
        }

        // We're, after all, a Layout Template Mapper...
        String defaultName = templateService.getDefaultLayoutTemplateName(templateName);

        // This is an optimization. If the name we're looking for is
        // already the default name for the template, don't do a "first run"
        // which looks for an exact match.
        boolean firstRun = !templateName.equals(defaultName);

        for(;;)
        {
            String templatePackage = StringUtils.join(components.iterator(), String.valueOf(separator));

            log.debug("templatePackage is now: {}", templatePackage);

            StringBuilder testName = new StringBuilder();

            if (!components.isEmpty())
            {
                testName.append(templatePackage);
                testName.append(separator);
            }

            testName.append((firstRun)
                ? templateName
                : defaultName);

            // But the Templating service must look for the name with prefix
            StringBuilder templatePath = new StringBuilder();
            if (StringUtils.isNotEmpty(prefix))
            {
                templatePath.append(prefix);
                templatePath.append(separator);
            }
            templatePath.append(testName);

            log.debug("Looking for {}", templatePath);

            if (tes.templateExists(templatePath.toString()))
            {
                log.debug("Found it, returning {}", testName);
                return testName.toString();
            }

            if (firstRun)
            {
                firstRun = false;
            }
            else
            {
                // We're no longer on the first Run (so we
                // already tested the "Default" template)
                // and the package is empty (we've hit the
                // root. So we now break the endless loop.
                if (components.isEmpty())
                {
                    break; // for(;;)
                }
                // We still have components. Remove the
                // last one and go through the loop again.
                components.remove(componentSize--);
            }
        }

        log.debug("Returning default");
        return getDefaultName(template);
    }