public static UIComponent addTransient(
      FacesContext context, ServletRequest req, UIComponent parent, String prevId, Class childClass)
      throws Exception {
    if (context == null) context = FacesContext.getCurrentInstance();

    if (parent == null) {
      UIComponentClassicTagBase parentTag =
          (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");

      parent = parentTag.getComponentInstance();

      BodyContent body = parentTag.getBodyContent();

      if (body != null) addVerbatim(parent, body);
    }

    UIComponent child = null;
    ;

    if (child == null) child = (UIComponent) childClass.newInstance();

    child.setTransient(true);

    addChild(parent, prevId, child);

    return child;
  }
  public static UIComponent addFacet(
      FacesContext context,
      ServletRequest req,
      UIComponent parent,
      String facetName,
      ValueExpression binding,
      Class childClass)
      throws Exception {
    if (context == null) context = FacesContext.getCurrentInstance();

    if (parent == null) {
      UIComponentClassicTagBase parentTag =
          (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");

      parent = parentTag.getComponentInstance();
    }

    UIComponent child = null;

    if (binding != null) child = (UIComponent) binding.getValue(context.getELContext());

    if (child == null) child = (UIComponent) childClass.newInstance();

    if (parent != null) parent.getFacets().put(facetName, child);

    if (binding != null) binding.setValue(context.getELContext(), child);

    return child;
  }
  public static UIComponent addPersistent(
      FacesContext context,
      ServletRequest req,
      UIComponent parent,
      ValueExpression binding,
      Class childClass)
      throws Exception {
    if (context == null) context = FacesContext.getCurrentInstance();

    if (parent == null) {
      UIComponentClassicTagBase parentTag =
          (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");

      parent = parentTag.getComponentInstance();

      BodyContent body = parentTag.getBodyContent();

      addVerbatim(parent, body);
    }

    UIComponent child = null;

    if (binding != null) child = (UIComponent) binding.getValue(context.getELContext());

    if (child == null) {
      child = (UIComponent) childClass.newInstance();

      // jsf/3251
      if (binding != null) binding.setValue(context.getELContext(), child);
    }

    if (parent != null) parent.getChildren().add(child);

    return child;
  }
  public static UIComponent findPersistent(
      FacesContext context, ServletRequest req, UIComponent parent, String id) throws Exception {
    if (context == null) context = FacesContext.getCurrentInstance();

    BodyContent body = null;

    if (parent == null) {
      UIComponentClassicTagBase parentTag =
          (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");

      parent = parentTag.getComponentInstance();

      body = parentTag.getBodyContent();
    }

    if (parent != null) {
      List<UIComponent> children = parent.getChildren();
      int size = children.size();

      String prevId = null;
      for (int i = 0; i < size; i++) {
        UIComponent child = children.get(i);

        if (id.equals(child.getId())) {
          if (body != null) addVerbatim(parent, prevId, body);

          return child;
        }

        if (child.getId() != null) prevId = child.getId();
      }
    }

    return null;
  }
  public static UIComponent findFacet(
      FacesContext context, ServletRequest req, UIComponent parent, String facetName)
      throws Exception {
    if (context == null) FacesContext.getCurrentInstance();

    if (parent == null) {
      UIComponentClassicTagBase parentTag =
          (UIComponentClassicTagBase) req.getAttribute("caucho.jsf.parent");

      parent = parentTag.getComponentInstance();
    }

    if (parent != null) return parent.getFacet(facetName);
    else return null;
  }
  public static UIViewRoot findRoot(FacesContext context, ServletRequest req, Object etag)
      throws Exception {
    if (context == null) context = FacesContext.getCurrentInstance();

    UIViewRoot root = context.getViewRoot();

    if (root == null)
      throw new NullPointerException(L.l("f:view can't find current in FacesContext"));

    Object oldETag = root.getAttributes().get("caucho.etag");

    if (oldETag != null && !oldETag.equals(etag)) {
      // clear view on JSP change

      root.getChildren().clear();
      root.getFacets().clear();
    }

    root.getAttributes().put("caucho.etag", etag);

    return root;
  }
  protected void setProperties(UIComponent component) {
    super.setProperties(component);
    javax.faces.component.UISelectOne selectone = null;
    try {
      selectone = (javax.faces.component.UISelectOne) component;
    } catch (ClassCastException cce) {
      throw new IllegalStateException(
          "Component "
              + component.toString()
              + " not expected type.  Expected: javax.faces.component.UISelectOne.  Perhaps you're missing a tag?");
    }

    if (converter != null) {
      if (!converter.isLiteralText()) {
        selectone.setValueExpression("converter", converter);
      } else {
        Converter conv =
            FacesContext.getCurrentInstance()
                .getApplication()
                .createConverter(converter.getExpressionString());
        selectone.setConverter(conv);
      }
    }

    if (converterMessage != null) {
      selectone.setValueExpression("converterMessage", converterMessage);
    }

    if (immediate != null) {
      selectone.setValueExpression("immediate", immediate);
    }

    if (required != null) {
      selectone.setValueExpression("required", required);
    }

    if (requiredMessage != null) {
      selectone.setValueExpression("requiredMessage", requiredMessage);
    }

    if (validator != null) {
      selectone.addValidator(new MethodExpressionValidator(validator));
    }
    if (validatorMessage != null) {
      selectone.setValueExpression("validatorMessage", validatorMessage);
    }

    if (value != null) {
      selectone.setValueExpression("value", value);
    }

    if (valueChangeListener != null) {
      selectone.addValueChangeListener(
          new MethodExpressionValueChangeListener(valueChangeListener));
    }
    if (accesskey != null) {
      selectone.setValueExpression("accesskey", accesskey);
    }
    if (dir != null) {
      selectone.setValueExpression("dir", dir);
    }
    if (disabled != null) {
      selectone.setValueExpression("disabled", disabled);
    }
    if (disabledClass != null) {
      selectone.setValueExpression("disabledClass", disabledClass);
    }
    if (enabledClass != null) {
      selectone.setValueExpression("enabledClass", enabledClass);
    }
    if (label != null) {
      selectone.setValueExpression("label", label);
    }
    if (lang != null) {
      selectone.setValueExpression("lang", lang);
    }
    if (onblur != null) {
      selectone.setValueExpression("onblur", onblur);
    }
    if (onchange != null) {
      selectone.setValueExpression("onchange", onchange);
    }
    if (onclick != null) {
      selectone.setValueExpression("onclick", onclick);
    }
    if (ondblclick != null) {
      selectone.setValueExpression("ondblclick", ondblclick);
    }
    if (onfocus != null) {
      selectone.setValueExpression("onfocus", onfocus);
    }
    if (onkeydown != null) {
      selectone.setValueExpression("onkeydown", onkeydown);
    }
    if (onkeypress != null) {
      selectone.setValueExpression("onkeypress", onkeypress);
    }
    if (onkeyup != null) {
      selectone.setValueExpression("onkeyup", onkeyup);
    }
    if (onmousedown != null) {
      selectone.setValueExpression("onmousedown", onmousedown);
    }
    if (onmousemove != null) {
      selectone.setValueExpression("onmousemove", onmousemove);
    }
    if (onmouseout != null) {
      selectone.setValueExpression("onmouseout", onmouseout);
    }
    if (onmouseover != null) {
      selectone.setValueExpression("onmouseover", onmouseover);
    }
    if (onmouseup != null) {
      selectone.setValueExpression("onmouseup", onmouseup);
    }
    if (onselect != null) {
      selectone.setValueExpression("onselect", onselect);
    }
    if (readonly != null) {
      selectone.setValueExpression("readonly", readonly);
    }
    if (style != null) {
      selectone.setValueExpression("style", style);
    }
    if (styleClass != null) {
      selectone.setValueExpression("styleClass", styleClass);
    }
    if (tabindex != null) {
      selectone.setValueExpression("tabindex", tabindex);
    }
    if (title != null) {
      selectone.setValueExpression("title", title);
    }
  }