public void encodeBegin()

in impl/src/main/java/org/apache/myfaces/renderkit/html/base/HtmlButtonRendererBase.java [115:275]
138 lines of code
29 McCabe index (conditional complexity)

    public void encodeBegin(FacesContext facesContext, UIComponent uiComponent) throws IOException
    {
        RendererUtils.checkParamValidity(facesContext, uiComponent, UICommand.class);

        String clientId = uiComponent.getClientId(facesContext);

        ResponseWriter writer = facesContext.getResponseWriter();
        
        // commandButton does not need to be nested in a form since Faces 2.0
        UIForm form = ComponentUtils.findClosest(UIForm.class, uiComponent);

        boolean reset = isReset(uiComponent);
        boolean button = isButton(uiComponent);

        Map<String, List<ClientBehavior>> behaviors = null;
        if (uiComponent instanceof ClientBehaviorHolder holder)
        {
            behaviors = holder.getClientBehaviors();
            if (!behaviors.isEmpty())
            {
                ResourceUtils.renderDefaultJsfJsInlineIfNecessary(facesContext, writer);
            }
        }

        List<UIParameter> validParams = HtmlRendererUtils.getValidUIParameterChildren(
                facesContext, getChildren(uiComponent), false, false);

        if (form != null && (validParams != null && !validParams.isEmpty()))
        {
            HtmlRendererUtils.renderFormSubmitScript(facesContext);
        }

        String commandOnclick = (String)uiComponent.getAttributes().get(HTML.ONCLICK_ATTR);
        
        if (commandOnclick != null && (validParams != null && !validParams.isEmpty()))
        {
            ResourceUtils.renderDefaultJsfJsInlineIfNecessary(facesContext, writer);
        }

        writer.startElement(HTML.INPUT_ELEM, uiComponent);

        writer.writeAttribute(HTML.ID_ATTR, clientId, ComponentAttrs.ID_ATTR);
        writer.writeAttribute(HTML.NAME_ATTR, clientId, ComponentAttrs.ID_ATTR);

        String image = RendererUtils.getIconSrc(facesContext, uiComponent, ComponentAttrs.IMAGE_ATTR);
        if (image != null)
        {
            writer.writeAttribute(HTML.TYPE_ATTR, HTML.INPUT_TYPE_IMAGE, ComponentAttrs.TYPE_ATTR);
            writer.writeURIAttribute(HTML.SRC_ATTR, image, ComponentAttrs.IMAGE_ATTR);
        }
        else
        {
            String type = getType(uiComponent);

            if (type == null || (!reset && !button))
            {
                type = HTML.INPUT_TYPE_SUBMIT;
            }
            writer.writeAttribute(HTML.TYPE_ATTR, type, ComponentAttrs.TYPE_ATTR);
            Object value = getValue(uiComponent);
            if (value != null)
            {
                writer.writeAttribute(HTML.VALUE_ATTR, value, ComponentAttrs.VALUE_ATTR);
            }
        }
        
        if (ClientBehaviorRendererUtils.hasClientBehavior(ClientBehaviorEvents.CLICK, behaviors)
                || ClientBehaviorRendererUtils.hasClientBehavior(ClientBehaviorEvents.ACTION, behaviors))
        {
            if (!reset && !button)
            {
                String onClick = buildBehaviorizedOnClick(uiComponent, behaviors, facesContext, writer,
                        form, validParams);
                if (onClick.length() != 0)
                {
                    writer.writeAttribute(HTML.ONCLICK_ATTR, onClick, null);
                }
            }
            else
            {
                Collection<ClientBehaviorContext.Parameter> paramList = 
                    ClientBehaviorRendererUtils.getClientBehaviorContextParameters(
                        HtmlRendererUtils.mapAttachedParamsToStringValues(facesContext, uiComponent));
                    
                String onClick = ClientBehaviorRendererUtils.buildBehaviorChain(facesContext, uiComponent,
                        ClientBehaviorEvents.CLICK, paramList, ClientBehaviorEvents.ACTION, paramList, behaviors,
                        commandOnclick , null);
                if (onClick.length() != 0)
                {
                    writer.writeAttribute(HTML.ONCLICK_ATTR, onClick, null);
                }
            }
            
            Map<String, Object> attributes = uiComponent.getAttributes(); 
            
            ClientBehaviorRendererUtils.buildBehaviorChain(facesContext, uiComponent, ClientBehaviorEvents.DBLCLICK,
                    null, behaviors, (String) attributes.get(HTML.ONDBLCLICK_ATTR), "");
        }
        else
        {
            //fallback into the pre 2.0 code to keep backwards compatibility with libraries which rely on internals
            if (!reset && !button)
            {
                StringBuilder onClick = buildOnClick(uiComponent, facesContext, writer, validParams);
                if (onClick.length() != 0)
                {
                    writer.writeAttribute(HTML.ONCLICK_ATTR, onClick.toString(), null);
                }
            }
            else
            {
                HtmlRendererUtils.renderHTMLStringAttribute(writer, uiComponent, HTML.ONCLICK_ATTR, HTML.ONCLICK_ATTR);
            }
        }
        
        if (isCommonPropertiesOptimizationEnabled(facesContext))
        {
            CommonHtmlAttributesUtil.renderButtonPassthroughPropertiesWithoutDisabledAndEvents(writer, 
                    CommonHtmlAttributesUtil.getMarkedAttributes(uiComponent), uiComponent);
        }
        else
        {
            HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent,
                                                   HTML.BUTTON_PASSTHROUGH_ATTRIBUTES_WITHOUT_DISABLED_AND_EVENTS);
        }

        if (behaviors != null && !behaviors.isEmpty())
        {
            HtmlRendererUtils.renderBehaviorizedEventHandlersWithoutOnclick(
                    facesContext, writer, uiComponent, behaviors);
            HtmlRendererUtils.renderBehaviorizedFieldEventHandlers(facesContext, writer, uiComponent, behaviors);
        }
        else
        {
            if (isCommonPropertiesOptimizationEnabled(facesContext))
            {
                long commonAttributesMarked = CommonHtmlAttributesUtil.getMarkedAttributes(uiComponent);
                CommonHtmlAttributesUtil.renderEventPropertiesWithoutOnclick(writer,
                        commonAttributesMarked, uiComponent);
                CommonHtmlAttributesUtil.renderCommonFieldEventProperties(writer,
                        commonAttributesMarked, uiComponent);
            }
            else
            {
                HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent,
                        HTML.EVENT_HANDLER_ATTRIBUTES_WITHOUT_ONCLICK);
                HtmlRendererUtils.renderHTMLAttributes(writer, uiComponent,
                        HTML.COMMON_FIELD_EVENT_ATTRIBUTES);
            }
        }

        if (isDisabled(facesContext, uiComponent))
        {
            writer.writeAttribute(HTML.DISABLED_ATTR, HTML.DISABLED_ATTR, ComponentAttrs.DISABLED_ATTR);
        }
        
        if (isReadonly(facesContext, uiComponent))
        {
            writer.writeAttribute(HTML.READONLY_ATTR, HTML.READONLY_ATTR, ComponentAttrs.READONLY_ATTR);
        }
    }