/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.myfaces.shared.renderkit.html;
  
  import java.io.IOException;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  
  import javax.faces.component.UICommand;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UIParameter;
  import javax.faces.component.ValueHolder;
  import javax.faces.component.behavior.ClientBehavior;
  import javax.faces.component.behavior.ClientBehaviorContext;
  import javax.faces.component.behavior.ClientBehaviorHolder;
  import javax.faces.component.html.HtmlCommandButton;
  import javax.faces.component.html.HtmlCommandLink;
  import javax.faces.context.FacesContext;
  import javax.faces.context.ResponseWriter;
  import javax.faces.event.ActionEvent;
  
  import org.apache.myfaces.shared.config.MyfacesConfig;
  import org.apache.myfaces.shared.renderkit.ClientBehaviorEvents;
  import org.apache.myfaces.shared.renderkit.JSFAttr;
  import org.apache.myfaces.shared.renderkit.RendererUtils;
  import org.apache.myfaces.shared.renderkit.html.util.FormInfo;
  import org.apache.myfaces.shared.renderkit.html.util.JavascriptUtils;
  import org.apache.myfaces.shared.renderkit.html.util.ResourceUtils;
  import org.apache.myfaces.shared.util._ComponentUtils;
  
  public class HtmlButtonRendererBase
      extends HtmlRenderer
  {
      private static final String IMAGE_BUTTON_SUFFIX_X = ".x";
      private static final String IMAGE_BUTTON_SUFFIX_Y = ".y";
  
      public static final String ACTION_FOR_LIST = "org.apache.myfaces.ActionForList";
  
      public void decode(FacesContext facesContext, UIComponent uiComponent)
      {
          org.apache.myfaces.shared.renderkit.RendererUtils.checkParamValidity(
                  facesContext, uiComponent, UICommand.class);
  
          //super.decode must not be called, because value is handled here
          boolean disabled = isDisabled(facesContext, uiComponent);
          // MYFACES-3960 Decode, decode client behavior and queue action event at the end
          boolean activateActionEvent = !isReset(uiComponent) && isSubmitted(facesContext, uiComponent) &&
              !disabled;
          if (activateActionEvent)
          {
              org.apache.myfaces.shared.renderkit.RendererUtils.initPartialValidationAndModelUpdate(
                      uiComponent, facesContext);
          }
          
          if (uiComponent instanceof ClientBehaviorHolder &&
                  !disabled)
          {
              HtmlRendererUtils.decodeClientBehaviors(facesContext, uiComponent);
          }
          
          if (activateActionEvent)
          {
              uiComponent.queueEvent(new ActionEvent(uiComponent));
          }
      }
  
      private static boolean isReset(UIComponent uiComponent)
      {
          return "reset".equals((String) uiComponent.getAttributes().get(HTML.TYPE_ATTR));
      }
      
      private static boolean isButton(UIComponent uiComponent)
      {
          return "button".equals((String) uiComponent.getAttributes().get(HTML.TYPE_ATTR));
      }
  
      private static boolean isSubmitted(FacesContext facesContext, UIComponent uiComponent)
      {
          String clientId = uiComponent.getClientId(facesContext);
          Map paramMap = facesContext.getExternalContext().getRequestParameterMap();
          FormInfo formInfo = _ComponentUtils.findNestingForm(uiComponent, facesContext);
         String hiddenLink = null;
          
         if (formInfo != null)
         {
             hiddenLink = (String) facesContext.getExternalContext().getRequestParameterMap().get(
                 HtmlRendererUtils.getHiddenCommandLinkFieldName(formInfo, facesContext));
         }
         return paramMap.containsKey(clientId) || paramMap.containsKey(clientId + IMAGE_BUTTON_SUFFIX_X) 
             || paramMap.containsKey(clientId + IMAGE_BUTTON_SUFFIX_Y)
             || (hiddenLink != null && hiddenLink.equals (clientId))
             || HtmlRendererUtils.isPartialOrBehaviorSubmit(facesContext, clientId);
     }
 
     @Override
     public void encodeBegin(FacesContext facesContext, UIComponent uiComponent) throws IOException
     {
         org.apache.myfaces.shared.renderkit.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 JSF 2.0
         FormInfo formInfo = findNestingForm(uiComponent, facesContext);
 
         boolean reset = isReset(uiComponent);
         boolean button = isButton(uiComponent);
 
         Map<String, List<ClientBehavior>> behaviors = null;
         if (uiComponent instanceof ClientBehaviorHolder)
         {
             behaviors = ((ClientBehaviorHolder) uiComponent).getClientBehaviors();
             if (!behaviors.isEmpty())
             {
                 ResourceUtils.renderDefaultJsfJsInlineIfNecessary(facesContext, writer);
             }
         }
         
         // If we are nested in a form, and we have javascript enabled, and autoscroll is enabled, 
         // we should write the form submit script
         // (define oamSetHiddenInput, oamClearHiddenInput, oamSubmitForm)
         // because oamSetHiddenInput is called on onclick function
         List<UIComponent> childrenList = null;
         if (getChildCount(uiComponent) > 0)
         {
             childrenList = getChildren(uiComponent);
         }
         else
         {
            childrenList = Collections.emptyList();
         }
         List<UIParameter> validParams = HtmlRendererUtils.getValidUIParameterChildren(
                 facesContext, childrenList, false, false);
         
         if (formInfo != null 
                 && (MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isAutoScroll() ||
                         (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, org.apache.myfaces.shared.renderkit.JSFAttr.ID_ATTR);
         writer.writeAttribute(HTML.NAME_ATTR, clientId, JSFAttr.ID_ATTR);
 
         String image = RendererUtils.getIconSrc(facesContext, uiComponent, JSFAttr.IMAGE_ATTR);
         if (image != null)
         {
             writer.writeAttribute(HTML.TYPE_ATTR, HTML.INPUT_TYPE_IMAGE, 
                     org.apache.myfaces.shared.renderkit.JSFAttr.TYPE_ATTR);
             writer.writeURIAttribute(HTML.SRC_ATTR, image, org.apache.myfaces.shared.renderkit.JSFAttr.IMAGE_ATTR);
         }
         else
         {
             String type = getType(uiComponent);
 
             if (type == null || (!reset && !button))
             {
                 type = HTML.INPUT_TYPE_SUBMIT;
             }
             writer.writeAttribute(HTML.TYPE_ATTR, type, org.apache.myfaces.shared.renderkit.JSFAttr.TYPE_ATTR);
             Object value = getValue(uiComponent);
             if (value != null)
             {
                 writer.writeAttribute(org.apache.myfaces.shared.renderkit.html.HTML.VALUE_ATTR, value, 
                         org.apache.myfaces.shared.renderkit.JSFAttr.VALUE_ATTR);
             }
         }
         
         if ((HtmlRendererUtils.hasClientBehavior(ClientBehaviorEvents.CLICK, behaviors, facesContext) ||
              HtmlRendererUtils.hasClientBehavior(ClientBehaviorEvents.ACTION, behaviors, facesContext)))
         {
             if (!reset && !button)
             {
                 String onClick = buildBehaviorizedOnClick(
                         uiComponent, behaviors, facesContext, writer, formInfo, validParams);
                 if (onClick.length() != 0)
                 {
                     writer.writeAttribute(HTML.ONCLICK_ATTR, onClick, null);
                 }
             }
             else
             {
                 Collection<ClientBehaviorContext.Parameter> paramList = 
                     HtmlRendererUtils.getClientBehaviorContextParameters(
                         HtmlRendererUtils.mapAttachedParamsToStringValues(facesContext, uiComponent));
                     
                 String onClick = HtmlRendererUtils.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(); 
             
             HtmlRendererUtils.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 (javascriptAllowed)
         //{
             if (isCommonPropertiesOptimizationEnabled(facesContext))
             {
                 CommonPropertyUtils.renderButtonPassthroughPropertiesWithoutDisabledAndEvents(writer, 
                         CommonPropertyUtils.getCommonPropertiesMarked(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 commonPropertiesMarked = CommonPropertyUtils.getCommonPropertiesMarked(uiComponent);
                 CommonPropertyUtils.renderEventPropertiesWithoutOnclick(writer, commonPropertiesMarked, uiComponent);
                 CommonPropertyUtils.renderCommonFieldEventProperties(writer, commonPropertiesMarked, 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, Boolean.TRUE, 
                     org.apache.myfaces.shared.renderkit.JSFAttr.DISABLED_ATTR);
         }
         
         if (isReadonly(facesContext, uiComponent))
         {
             writer.writeAttribute(HTML.READONLY_ATTR, Boolean.TRUE, 
                     org.apache.myfaces.shared.renderkit.JSFAttr.READONLY_ATTR);
         }
     }
     
     public void encodeEnd(FacesContext facesContext, UIComponent uiComponent)
             throws IOException
     {
         ResponseWriter writer = facesContext.getResponseWriter();
 
         writer.endElement(HTML.INPUT_ELEM);
         
         FormInfo formInfo = findNestingForm(uiComponent, facesContext);
         if (formInfo != null)
         {
             HtmlFormRendererBase.renderScrollHiddenInputIfNecessary(
                     formInfo.getForm(), facesContext, writer);
         }
         
         // render the UIParameter children of the commandButton (since 2.0)
         /*
         List<UIParameter> validParams = HtmlRendererUtils.getValidUIParameterChildren(
                 facesContext, uiComponent.getChildren(), false, false);
         for (UIParameter param : validParams)
         {
             HtmlInputHidden parameterComponent = new HtmlInputHidden();
             parameterComponent.setId(param.getName());
             parameterComponent.setValue(param.getValue());
             parameterComponent.encodeAll(facesContext);
         }*/
     }
 
     protected String buildBehaviorizedOnClick(UIComponent uiComponent, Map<String, List<ClientBehavior>> behaviors, 
                                               FacesContext facesContext, ResponseWriter writer, 
                                               FormInfo nestedFormInfo, List<UIParameter> validParams)
         throws IOException
     {
         //we can omit autoscroll here for now maybe we should check if it is an ajax 
         //behavior and omit it only in this case
         StringBuilder userOnClick = new StringBuilder();
         //user onclick part 
         String commandOnClick = (String) uiComponent.getAttributes().get(HTML.ONCLICK_ATTR);
 
         if (commandOnClick != null)
         {
             userOnClick.append(commandOnClick);
             userOnClick.append(';');
         }
 
         StringBuilder rendererOnClick = new StringBuilder();
 
         if (nestedFormInfo != null) 
         {
             // There is no clean way to detect if a "submit" behavior has been added to the component, 
             // so to keep things simple, if the button is submit type, it is responsibility of the 
             // developer to add a client behavior that submit the form, for example using a f:ajax tag.
             // Otherwise, there will be a situation where a full submit could be trigger after an ajax
             // operation. Note we still need to append two scripts if necessary: autoscroll and clear
             // hidden fields, because this code is called for a submit button.
             //if (behaviors.isEmpty() && validParams != null && !validParams.isEmpty() )
             //{
             //    rendererOnClick.append(buildServerOnclick(facesContext, uiComponent, 
             //            uiComponent.getClientId(facesContext), nestedFormInfo, validParams));
             //}
             //else
             //{
                 String formName = nestedFormInfo.getFormName();
                 if (JavascriptUtils.isRenderClearJavascriptOnButton(facesContext.getExternalContext()))
                 {
                     //call the script to clear the form (clearFormHiddenParams_<formName>) method
                     HtmlRendererUtils.appendClearHiddenCommandFormParamsFunctionCall(rendererOnClick, formName);
                 }
         
                 if (MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isAutoScroll())
                 {
                     HtmlRendererUtils.appendAutoScrollAssignment(rendererOnClick, formName);
                 }
             //}
         }
 
         //according to the specification in jsf.util.chain jdocs and the spec document we have to use
         //jsf.util.chain to chain the functions and
         Collection<ClientBehaviorContext.Parameter> paramList = HtmlRendererUtils.getClientBehaviorContextParameters(
                 HtmlRendererUtils.mapAttachedParamsToStringValues(facesContext, uiComponent));
         
         return HtmlRendererUtils.buildBehaviorChain(facesContext, uiComponent,
                 ClientBehaviorEvents.CLICK, paramList, ClientBehaviorEvents.ACTION, paramList, behaviors,
                 userOnClick.toString() , rendererOnClick.toString());
     }
     
     protected String buildServerOnclick(FacesContext facesContext, UIComponent component, 
             String clientId, FormInfo formInfo, List<UIParameter> validParams) throws IOException
     {
         UIComponent nestingForm = formInfo.getForm();
         String formName = formInfo.getFormName();
 
         StringBuilder onClick = new StringBuilder();
 
         if (RendererUtils.isAdfOrTrinidadForm(formInfo.getForm()))
         {
             onClick.append("submitForm('");
             onClick.append(formInfo.getForm().getClientId(facesContext));
             onClick.append("',1,{source:'");
             onClick.append(component.getClientId(facesContext));
             onClick.append("'});return false;");
         }
         else
         {
             StringBuilder params = addChildParameters(facesContext, nestingForm, validParams);
 
             String target = getTarget(component);
 
             onClick.append("return ").
                 append(HtmlRendererUtils.SUBMIT_FORM_FN_NAME_JSF2).append("('").
                 append(formName).append("','").
                 append(component.getClientId(facesContext)).append("'");
 
             if (params.length() > 2 || target != null)
             {
                 onClick.append(",").
                     append(target == null ? "null" : ("'" + target + "'")).append(",").
                     append(params);
             }
             onClick.append(");");
 
             //Not necessary since we are using oamSetHiddenInput to create input hidden fields
             //render hidden field - todo: in here for backwards compatibility
             //String hiddenFieldName = HtmlRendererUtils.getHiddenCommandLinkFieldName(formInfo);
             //addHiddenCommandParameter(facesContext, nestingForm, hiddenFieldName);
 
         }
         return onClick.toString();
     }
     
     private StringBuilder addChildParameters(FacesContext context, 
             UIComponent nestingForm, List<UIParameter> validParams)
     {
         //add child parameters
         StringBuilder params = new StringBuilder();
         params.append("[");
         
         for (UIParameter param : validParams) 
         {
             String name = param.getName();
 
             //Not necessary, since we are using oamSetHiddenInput to create hidden fields
             if (MyfacesConfig.getCurrentInstance(context.getExternalContext()).isRenderHiddenFieldsForLinkParams())
             {
                 addHiddenCommandParameter(context, nestingForm, name);
             }
 
             Object value = param.getValue();
 
             //UIParameter is no ValueHolder, so no conversion possible - calling .toString on value....
             // MYFACES-1832 bad charset encoding for f:param
             // if HTMLEncoder.encode is called, then
             // when is called on writer.writeAttribute, encode method
             // is called again so we have a duplicated encode call.
             // MYFACES-2726 All '\' and "'" chars must be escaped 
             // because there will be inside "'" javascript quotes, 
             // otherwise the value will not correctly restored when
             // the command is post.
             //String strParamValue = value != null ? value.toString() : "";
             String strParamValue = "";
             if (value != null)
             {
                 strParamValue = value.toString();
                 StringBuilder buff = null;
                 for (int i = 0; i < strParamValue.length(); i++)
                 {
                     char c = strParamValue.charAt(i); 
                     if (c == '\'' || c == '\\')
                     {
                         if (buff == null)
                         {
                             buff = new StringBuilder();
                             buff.append(strParamValue.substring(0,i));
                         }
                         buff.append('\\');
                         buff.append(c);
                     }
                     else if (buff != null)
                     {
                         buff.append(c);
                     }
                 }
                 if (buff != null)
                 {
                     strParamValue = buff.toString();
                 }
             }
 
             if (params.length() > 1) 
             {
                 params.append(",");
             }
 
             params.append("['");
             params.append(name);
             params.append("','");
             params.append(strParamValue);
             params.append("']");
         }
         params.append("]");
         return params;
     }
 
     private String getTarget(UIComponent component)
     {
         // for performance reason: double check for the target attribute
         String target;
         if (component instanceof HtmlCommandLink)
         {
             target = ((HtmlCommandLink) component).getTarget();
         }
         else
         {
             target = (String) component.getAttributes().get(HTML.TARGET_ATTR);
         }
         return target;
     }
 
     protected StringBuilder buildOnClick(UIComponent uiComponent, FacesContext facesContext,
                                         ResponseWriter writer, List<UIParameter> validParams)
         throws IOException
     {
         /* DUMMY STUFF
         //Find form
         UIComponent parent = uiComponent.getParent();
         while (parent != null && !(parent instanceof UIForm))
         {
             parent = parent.getParent();
         }
 
         UIForm nestingForm = null;
         String formName;
 
         if (parent != null)
         {
             //link is nested inside a form
             nestingForm = (UIForm)parent;
             formName = nestingForm.getClientId(facesContext);
 
         }
         else
         {
             //not nested in form, we must add a dummy form at the end of the document
             formName = DummyFormUtils.DUMMY_FORM_NAME;
             //dummyFormResponseWriter = DummyFormUtils.getDummyFormResponseWriter(facesContext);
             //dummyFormResponseWriter.setWriteDummyForm(true);
             DummyFormUtils.setWriteDummyForm(facesContext, true);
         }
         */
         StringBuilder onClick = new StringBuilder();
         String commandOnClick = (String) uiComponent.getAttributes().get(HTML.ONCLICK_ATTR);
 
         if (commandOnClick != null)
         {
             onClick.append("var cf = function(){");
             onClick.append(commandOnClick);
             onClick.append('}');
             onClick.append(';');
             onClick.append("var oamSF = function(){");
         }
         
         FormInfo nestedFormInfo = findNestingForm(uiComponent, facesContext);
         
         if (nestedFormInfo != null)
         {
             String formName = nestedFormInfo.getFormName();
             
             if (validParams != null && !validParams.isEmpty() )
             {
                 StringBuilder params = addChildParameters(
                         facesContext, nestedFormInfo.getForm(), validParams);
 
                 String target = getTarget(uiComponent);
 
                 onClick.append("return ").
                     append(HtmlRendererUtils.SUBMIT_FORM_FN_NAME_JSF2).append("('").
                     append(formName).append("','").
                     append(uiComponent.getClientId(facesContext)).append("'");
 
                 if (params.length() > 2 || target != null)
                 {
                     onClick.append(",").
                         append(target == null ? "null" : ("'" + target + "'")).append(",").
                         append(params);
                 }
                 onClick.append(");");
 
                 //Not necessary since we are using oamSetHiddenInput to create input hidden fields
                 //render hidden field - todo: in here for backwards compatibility
                 if (MyfacesConfig.getCurrentInstance(
                         facesContext.getExternalContext()).isRenderHiddenFieldsForLinkParams())
                 {
                     String hiddenFieldName = HtmlRendererUtils.getHiddenCommandLinkFieldName(
                             nestedFormInfo, facesContext);
                     addHiddenCommandParameter(facesContext, nestedFormInfo.getForm(), hiddenFieldName);
                 }
             }
             else
             {
         
                 if (JavascriptUtils.isRenderClearJavascriptOnButton(facesContext.getExternalContext()) ||
                         MyfacesConfig.getCurrentInstance(
                                 facesContext.getExternalContext()).isRenderHiddenFieldsForLinkParams() )
                 {
                     //call the script to clear the form (clearFormHiddenParams_<formName>) method
                     HtmlRendererUtils.appendClearHiddenCommandFormParamsFunctionCall(onClick, formName);
                 }
         
                 if (MyfacesConfig.getCurrentInstance(facesContext.getExternalContext()).isAutoScroll())
                 {
                     HtmlRendererUtils.appendAutoScrollAssignment(onClick, formName);
                 }
             }
         }
         
         if (commandOnClick != null)
         {
             onClick.append('}');
             onClick.append(';');
             onClick.append("return (cf.apply(this, [])==false)? false : oamSF.apply(this, []); ");
         }  
 
         //The hidden field has only sense if isRenderClearJavascriptOnButton is
         //set to true. In other case, this hidden field should not be rendered.
         //if (JavascriptUtils.isRenderClearJavascriptOnButton(facesContext.getExternalContext()))
         //{
             //add hidden field for the case there is no commandLink in the form
             //String hiddenFieldName = HtmlRendererUtils.getHiddenCommandLinkFieldName(formInfo);
             //addHiddenCommandParameter(facesContext, nestingForm, hiddenFieldName);
         //}
 
         return onClick;
     }
 
     protected void addHiddenCommandParameter(FacesContext facesContext, 
             UIComponent nestingForm, String hiddenFieldName)
     {
         if (nestingForm != null)
         {
             HtmlFormRendererBase.addHiddenCommandParameter(facesContext, nestingForm, hiddenFieldName);
         }
     }
 
     /**
      * find nesting form<br />
      * need to be overrideable to deal with dummyForm stuff in tomahawk.
      */
     protected FormInfo findNestingForm(UIComponent uiComponent, FacesContext facesContext)
     {
         return RendererUtils.findNestingForm(uiComponent, facesContext);
     }
 
     protected boolean isDisabled(FacesContext facesContext, UIComponent uiComponent)
     {
         //TODO: overwrite in extended HtmlButtonRenderer and check for enabledOnUserRole
         if (uiComponent instanceof HtmlCommandButton)
         {
             return ((HtmlCommandButton)uiComponent).isDisabled();
         }
 
         return org.apache.myfaces.shared.renderkit.RendererUtils.getBooleanAttribute(
                 uiComponent, HTML.DISABLED_ATTR, false);
         
     }
 
     protected boolean isReadonly(FacesContext facesContext, UIComponent uiComponent)
     {
         if (uiComponent instanceof HtmlCommandButton)
         {
             return ((HtmlCommandButton)uiComponent).isReadonly();
         }
         return org.apache.myfaces.shared.renderkit.RendererUtils.getBooleanAttribute(
                 uiComponent, HTML.READONLY_ATTR, false);
     }
 
     private String getType(UIComponent uiComponent)
     {
         if (uiComponent instanceof HtmlCommandButton)
         {
             return ((HtmlCommandButton)uiComponent).getType();
         }
         return (String)uiComponent.getAttributes().get(org.apache.myfaces.shared.renderkit.JSFAttr.TYPE_ATTR);
     }
 
     private Object getValue(UIComponent uiComponent)
     {
         if (uiComponent instanceof ValueHolder)
         {
             return ((ValueHolder)uiComponent).getValue();
         }
         return uiComponent.getAttributes().get(JSFAttr.VALUE_ATTR);
     }
 }