public ProviderOutcome provide()

in src/main/java/org/apache/sling/scripting/sightly/impl/engine/extension/use/RenderUnitProvider.java [75:131]
56 lines of code
12 McCabe index (conditional complexity)

    public ProviderOutcome provide(String identifier, RenderContext renderContext, Bindings arguments) {
        if (identifier.endsWith("." + SightlyScriptEngineFactory.EXTENSION)) {
            Bindings globalBindings = renderContext.getBindings();
            SlingScriptHelper sling = BindingsUtils.getHelper(globalBindings);
            SlingHttpServletRequest request = BindingsUtils.getRequest(globalBindings);
            final Resource renderUnitResource = scriptDependencyResolver.resolveScript(renderContext, identifier);
            if (renderUnitResource == null) {
                // attempt to find a bundled render unit that does not expose a servlet resource via the search paths
                RenderUnit renderUnit = bundledUnitManager.getRenderUnit(globalBindings, identifier);
                if (renderUnit != null) {
                    return ProviderOutcome.success(renderUnit);
                }
                Resource caller = ResourceResolution.getResourceForRequest(request.getResourceResolver(), request);
                if (caller != null) {
                    String resourceSuperType = caller.getResourceSuperType();
                    StringBuilder errorMessage = new StringBuilder("Cannot find resource ");
                    errorMessage.append(identifier).append(" for base path ").append(caller.getPath());
                    if (StringUtils.isNotEmpty(resourceSuperType)) {
                        errorMessage.append(" with resource super type ").append(resourceSuperType);
                    }
                    errorMessage.append(".");
                    return ProviderOutcome.failure(new SightlyException(errorMessage.toString()));
                } else {
                    return ProviderOutcome.failure(
                            new SightlyException("Cannot resolve template " + identifier + " for script "
                                    + sling.getScript().getScriptResource().getPath()));
                }
            }
            try {
                if ("true".equalsIgnoreCase((String)
                        renderUnitResource.getResourceMetadata().get("sling.servlet.resource"))) {
                    BundledRenderUnit bundledRenderUnit = renderUnitResource.adaptTo(BundledRenderUnit.class);
                    if (bundledRenderUnit != null && bundledRenderUnit.getUnit() instanceof RenderUnit) {
                        return ProviderOutcome.success(bundledRenderUnit.getUnit());
                    }
                }
                SightlyScriptEngine sightlyScriptEngine = (SightlyScriptEngine)
                        bundledUnitManager.getScriptEngineFactory().getScriptEngine();
                String encoding = renderUnitResource.getResourceMetadata().getCharacterEncoding();
                if (StringUtils.isEmpty(encoding)) {
                    encoding = "UTF-8";
                }
                InputStream inputStream = renderUnitResource.adaptTo(InputStream.class);
                if (inputStream == null) {
                    return ProviderOutcome.failure();
                }
                InputStreamReader inputStreamReader = new InputStreamReader(inputStream, encoding);
                ScriptNameAwareReader reader =
                        new ScriptNameAwareReader(inputStreamReader, renderUnitResource.getPath());
                SightlyCompiledScript compiledScript = (SightlyCompiledScript) sightlyScriptEngine.compile(reader);
                return ProviderOutcome.success(compiledScript.getRenderUnit());
            } catch (Exception e) {
                return ProviderOutcome.failure(e);
            }
        }
        return ProviderOutcome.failure();
    }