public boolean render()

in velocity-engine-core/src/main/java/org/apache/velocity/runtime/RuntimeInstance.java [1475:1566]
79 lines of code
13 McCabe index (conditional complexity)

    public boolean render(Context context, Writer writer,
                          String logTag, SimpleNode nodeTree)
    {
        /*
         * we want to init then render
         */
        InternalContextAdapterImpl ica =
            new InternalContextAdapterImpl(context);

        ica.pushCurrentTemplateName(logTag);

        try
        {
            try
            {
                nodeTree.init(ica, this);
            }
            catch (TemplateInitException pex)
            {
                throw new ParseErrorException(pex, null);
            }
            /*
             * pass through application level runtime exceptions
             */
            catch(RuntimeException e)
            {
                throw e;
            }
            catch(Exception e)
            {
                String msg = "RuntimeInstance.render(): init exception for tag = "+logTag;
                log.error(msg, e);
                throw new VelocityException(msg, e, getLogContext().getStackTrace());
            }

            try
            {
                if (isScopeControlEnabled(evaluateScopeName))
                {
                    Object previous = ica.get(evaluateScopeName);
                    context.put(evaluateScopeName, new Scope(this, previous));
                }
                /*
                 * optionally put the context in itself if asked so
                 */
                String self = getString(CONTEXT_AUTOREFERENCE_KEY);
                if (self != null) context.put(self, context);
                nodeTree.render(ica, writer);
            }
            catch (StopCommand stop)
            {
                if (!stop.isFor(this))
                {
                    throw stop;
                }
                else
                {
                    log.debug(stop.getMessage());
                }
            }
            catch (IOException e)
            {
                throw new VelocityException("IO Error in writer: " + e.getMessage(), e, getLogContext().getStackTrace());
            }
        }
        finally
        {
            ica.popCurrentTemplateName();
            if (isScopeControlEnabled(evaluateScopeName))
            {
                Object obj = ica.get(evaluateScopeName);
                if (obj instanceof Scope)
                {
                    Scope scope = (Scope)obj;
                    if (scope.getParent() != null)
                    {
                        ica.put(evaluateScopeName, scope.getParent());
                    }
                    else if (scope.getReplaced() != null)
                    {
                        ica.put(evaluateScopeName, scope.getReplaced());
                    }
                    else
                    {
                        ica.remove(evaluateScopeName);
                    }
                }
            }
        }

        return true;
    }