Java Code Examples for javax.faces.component.UIComponent#getChildCount()

/**
 * Find if an event handler had been assigned for a particular event.
 * @param component
 * @param eventName
 * @return
 */
@SuppressWarnings("unchecked") // $NON-NLS-1$
public static XspEventHandler findHandler(UIComponent component, String eventName) {
    if(component.getChildCount()>0) {
        List<UIComponent> kids = component.getChildren();
        for(UIComponent kid: kids) {
            if(kid instanceof XspEventHandler) {
                XspEventHandler h = (XspEventHandler)kid;
                if(StringUtil.equals(h.getEvent(),eventName)) {
                    return h;
                }
            }
        }
    }
    return null;
}
 

/**
 * Collects every JSF node following the current JSF node within the same branch of the tree.
 * It's like "@next @next:@next @next:@next:@next ...".
 */
public List<UIComponent> resolve(UIComponent component, List<UIComponent> parentComponents, String currentId,
		String originalExpression, String[] parameters) {
	List<UIComponent> result = new ArrayList<UIComponent>();
	for (UIComponent parent : parentComponents) {
	UIComponent grandparent = component.getParent();
	for (int i = 0; i < grandparent.getChildCount(); i++) {
		if (grandparent.getChildren().get(i) == parent) {
			i++;
			while (i<grandparent.getChildCount()) {
				result.add(grandparent.getChildren().get(i));
				i++;
			}
		}
	}
	}
	if (result.size() > 0) {
		return result;
	}
	throw new FacesException("Invalid search expression - there's no successor to the component " + originalExpression);
}
 

/**
 * Collects everything preceding the current JSF node within the same branch of the tree.
 * It's like "@previous previous:@previous previous:@previous:@previous ...".
 */
public List<UIComponent> resolve(UIComponent component, List<UIComponent> parentComponents, String currentId,
		String originalExpression, String[] parameters) {
	List<UIComponent> result = new ArrayList<UIComponent>();
	for (UIComponent parent : parentComponents) {
		UIComponent grandparent = component.getParent();
		for (int i = 0; i < grandparent.getChildCount(); i++) {
			if (grandparent.getChildren().get(i) == parent) {
					if(i == 0) //if this is the first element of this component tree level there is no previous
						throw new FacesException(ERROR_MESSAGE + originalExpression);
					//otherwise take the components before this one
					while ((--i)>=0) {
						result.add(grandparent.getChildren().get(i));
					}
					return result;
			}
		}
	}

	throw new FacesException(ERROR_MESSAGE + originalExpression);
}
 

static private AbstractPicker _findPickerFor(UIComponent parent, String id) {
    if(parent.getChildCount()>0 || parent.getFacetCount() > 0) {
        for (Iterator<UIComponent> i = TypedUtil.getFacetsAndChildren(parent); i.hasNext();) {
            UIComponent next = i.next();
            // Look if this child is the label
            if(next instanceof AbstractPicker) {
                AbstractPicker lbl = (AbstractPicker)next;
                String _for = lbl.getFor();
                if(StringUtil.equals(_for, id)) {
                    return lbl;
                }
            }
            if (!(next instanceof NamingContainer)) {
                AbstractPicker n = _findPickerFor(next, id);
                if (n != null) {
                    return n;
                }
            }
        }
    }
    return null;
}
 

public static void dumpComponentsTree(List<UIComponent> componetns, int level) {
	if ((componetns == null) || (componetns.size() == 0)) {
		return;
	}

	StringBuffer levelString = new StringBuffer();
	for (int i = 0; i < level; i++) {
		levelString.append(" ");
	}

	for (UIComponent comp : componetns) {
		System.out.println(levelString + comp.getId());
		if (comp.getChildCount() > 0) {
			dumpComponentsTree(comp.getChildren(), level++);
		}
	}
}
 

/**
 * Renders components added seamlessly behind the input field.
 *
 * @param context
 *            the FacesContext
 * @param rw
 *            the response writer
 * @param appendingAddOnFacet
 *            optional facet behind the field. Can be null.
 * @param hasAppendingAddOn
 *            optional facet in front of the field. Can be null.
 * @throws IOException
 *             may be thrown by the response writer
 */
protected void addAppendingAddOnToInputGroup(FacesContext context, ResponseWriter rw,
		UIComponent appendingAddOnFacet, boolean hasAppendingAddOn, SelectMultiMenu menu) throws IOException {
	if (hasAppendingAddOn) {
		if (appendingAddOnFacet.getClass().getName().endsWith("Button") || (appendingAddOnFacet.getChildCount() > 0
				&& appendingAddOnFacet.getChildren().get(0).getClass().getName().endsWith("Button"))) {
			rw.startElement("div", menu);
			rw.writeAttribute("class", "input-group-btn", "class");
			appendingAddOnFacet.encodeAll(context);
			rw.endElement("div");
		} else {
			rw.startElement("span", menu);
			rw.writeAttribute("class", "input-group-addon", "class");
			appendingAddOnFacet.encodeAll(context);
			rw.endElement("span");
		}
	}
}
 

private static void resetInputComponents(UIComponent rootUIComponent) {
	if ((rootUIComponent == null) || (rootUIComponent.getChildCount() == 0)) {
		return;
	}

	for (UIComponent comp : rootUIComponent.getChildren()) {
		if (comp instanceof UIInput) {
			UIInput uiInput = (UIInput) comp;
			uiInput.setSubmittedValue(null);
			uiInput.setValid(true);
			uiInput.setLocalValueSet(false);
			uiInput.resetValue();
		}
		resetInputComponents(comp);
	}
}
 

/**
 * Remove all the children from a component.
 * @param component the parent component
 * @param facets indicates if the facets should be removed as well
 */
public static void removeChildren(UIComponent component, boolean facets) {
    if(component.getChildCount()>0) {
        TypedUtil.getChildren(component).clear();
    }
    if(component.getFacetCount()>0) {
        TypedUtil.getFacets(component).clear();
    }
}
 

private UIInput findEdit(UIComponent parent) {
    for(UIComponent c: TypedUtil.getChildren(parent)) {
        if(c instanceof UIInput) {
            return (UIInput)c;
        }
        if(c.getChildCount()>0) {
            UIInput e = findEdit(c);
            if(e!=null) {
                return e;
            }
        }
    }
    return null;
}
 

protected boolean isEmptyChildren(UIComponent c) {
    if(c.getChildCount()>0) {
        // We should check the children one by one...
        for(UIComponent child: TypedUtil.getChildren(c)) {
            if(!isEmptyComponent(child)) {
                return false;
            }
        }
    }
    // No children, so the list is empty
    return true;
}
 

protected void renderChildren(FacesContext context, UIComponent component) throws IOException {
    // encode component and children
    int count = component.getChildCount();
    if(count>0) {
        List<?> children = component.getChildren();
        for (int i=0; i<count; i++) {
            UIComponent child = (UIComponent)children.get(i);
            if(isRenderChild(context, child)) {
                FacesUtil.renderComponent(context, child);  
            }
        }
    }
}
 

/**
 * Renders components added seamlessly in front of the input field.
 *
 * @param context
 *            the FacesContext
 * @param rw
 *            the response writer
 * @param prependingAddOnFacet
 * @param hasPrependingAddOn
 * @throws IOException
 *             may be thrown by the response writer
 */
protected void addPrependingAddOnToInputGroup(FacesContext context, ResponseWriter rw,
		UIComponent prependingAddOnFacet, boolean hasPrependingAddOn, SelectMultiMenu menu) throws IOException {
	if (hasPrependingAddOn) {
		if (prependingAddOnFacet.getClass().getName().endsWith("Button")
				|| (prependingAddOnFacet.getChildCount() > 0
						&& prependingAddOnFacet.getChildren().get(0).getClass().getName().endsWith("Button"))) {
			rw.startElement("div", menu);
			rw.writeAttribute("class", "input-group-btn", "class");
			prependingAddOnFacet.encodeAll(context);
			rw.endElement("div");
		} else if (prependingAddOnFacet instanceof HtmlOutputText) {
			HtmlOutputText out = (HtmlOutputText) prependingAddOnFacet;

			String sc = out.getStyleClass();
			if (sc == null)
				sc = "input-group-addon";
			else
				sc = sc + " " + "input-group-addon";
			out.setStyleClass(sc);
			prependingAddOnFacet.encodeAll(context);
		} else {
			rw.startElement("span", menu);
			rw.writeAttribute("class", "input-group-addon", "class");
			prependingAddOnFacet.encodeAll(context);
			rw.endElement("span");
		}
	}
}
 

protected void renderChildren(FacesContext context, UIComponent component) throws IOException {
    // encode component and children
    int count = component.getChildCount();
    if (count > 0) {
        List<?> children = component.getChildren();
        for (int i = 0; i < count; i++) {
            UIComponent child = (UIComponent) children.get(i);
            if (isRenderChild(context, child)) {
                FacesUtil.renderComponent(context, child);
            }
        }
    }
}
 

/**
 * Add the correct class
 * 
 * @param parent
 * @param comp
 * @param ctx
 * @param rw
 * @throws IOException
 */
private static void decorateComponent(UIComponent parent, UIComponent comp, FacesContext ctx, ResponseWriter rw)
		throws IOException {
	if (comp instanceof Icon)
		((Icon) comp).setAddon(true); // modifies the id of the icon

	String classToApply = "input-group-addon";
	if (comp.getClass().getName().endsWith("Button") || comp.getChildCount() > 0)
		classToApply = "input-group-btn";

	if (comp instanceof HtmlOutputText) {
		HtmlOutputText out = (HtmlOutputText)comp;
		
		String sc = out.getStyleClass();
		if (sc == null)
			sc = classToApply;
		else
			sc = sc + " " + classToApply;
		out.setStyleClass(sc);
		comp.encodeAll(ctx);
	}
	else {
		rw.startElement("span", parent);
		rw.writeAttribute("class", classToApply, "class");
		comp.encodeAll(ctx);
	 rw.endElement("span");
	}
}
 

protected boolean isEmptyChildren(UIComponent c) {
    if (c.getChildCount() > 0) {
        // We should check the children one by one...
        for (UIComponent child : TypedUtil.getChildren(c)) {
            if (!isEmptyComponent(child)) {
                return false;
            }
        }
    }
    // No children, so the list is empty
    return true;
}
 

protected boolean isEmptyChildren(UIComponent c) {
    if (c.getChildCount() > 0) {
        // We should check the children one by one...
        for (UIComponent child : TypedUtil.getChildren(c)) {
            if (!isEmptyComponent(child)) {
                return false;
            }
        }
    }
    // No children, so the list is empty
    return true;
}
 

private UIComponent findPredecessor(UIComponent parent) {
	UIComponent grandparent = parent.getParent();
	for (int i = 0; i < grandparent.getChildCount(); i++) {
		if (grandparent.getChildren().get(i) == parent) {
				if(i == 0) //if this is the first element of this component tree level there is no previous
					return null;
				//otherwise take the component before this one
				return grandparent.getChildren().get(i-1);
		}
	}
	return null; // unreachable code - but the compiler doesn't know that
}
 

public void encodeInnerHtml(FacesContext facesContext, UIComponent component)throws IOException {

		UIData uiData = (UIData) component;
		ResponseWriter writer = facesContext.getResponseWriter();

		Styles styles = getStyles(uiData);
		
		int first = uiData.getFirst();
		int rows = uiData.getRows();
		int rowCount = uiData.getRowCount();
		if (rows <= 0)
		{
			rows = rowCount - first;
		}
		int last = first + rows;
		if (last > rowCount)
			last = rowCount;

		for (int i = first; i < last; i++)
		{
			uiData.setRowIndex(i);
			if (!uiData.isRowAvailable())
			{
                log.warn("Row is not available. Rowindex = " + i);
				return;
			}

			int columns = component.getChildCount();
			renderCategoryRow(i, columns, uiData, writer, i==first);

			beforeRow(facesContext, uiData);
			HtmlRendererUtils.writePrettyLineSeparator(facesContext);
			renderRowStart(facesContext, writer, uiData, styles, i);

			List children = component.getChildren();
			for (int j = 0, size = component.getChildCount(); j < size; j++)
			{
				UIComponent child = (UIComponent) children.get(j);
				if(child.isRendered())
				{
					encodeColumnChild(facesContext, writer, uiData, child, styles, j);
				}
			}
			renderRowEnd(facesContext, writer, uiData);

			afterRow(facesContext, uiData);
		}
	}
 

public void encodeInnerHtml(FacesContext facesContext, UIComponent component)throws IOException {

		UIData uiData = (UIData) component;
		ResponseWriter writer = facesContext.getResponseWriter();

		Styles styles = getStyles(uiData);
		
		int first = uiData.getFirst();
		int rows = uiData.getRows();
		int rowCount = uiData.getRowCount();
		if (rows <= 0)
		{
			rows = rowCount - first;
		}
		int last = first + rows;
		if (last > rowCount)
			last = rowCount;

		for (int i = first; i < last; i++)
		{
			uiData.setRowIndex(i);
			if (!uiData.isRowAvailable())
			{
                log.warn("Row is not available. Rowindex = " + i);
				return;
			}

			int columns = component.getChildCount();
			renderCategoryRow(i, columns, uiData, writer, i==first);

			beforeRow(facesContext, uiData);
			HtmlRendererUtils.writePrettyLineSeparator(facesContext);
			renderRowStart(facesContext, writer, uiData, styles, i);

			List children = component.getChildren();
			for (int j = 0, size = component.getChildCount(); j < size; j++)
			{
				UIComponent child = (UIComponent) children.get(j);
				if(child.isRendered())
				{
					encodeColumnChild(facesContext, writer, uiData, child, styles, j);
				}
			}
			renderRowEnd(facesContext, writer, uiData);

			afterRow(facesContext, uiData);
		}
	}
 

/**
 * Render the children of the navbar
 * @designer.publicmethod
 */
public void renderChildren(FacesContext context, ResponseWriter w, UIComponent component) throws IOException {
    // encode component and children
    // for children of the navbar we need to add a CSS class
    
    int count = component.getChildCount();
    if(count>0) {
        List<?> children = component.getChildren();
        for (int i=0; i<count; i++) {
            Object child = children.get(i);
            boolean addDiv = false;
            
            try{
                //Determine if the child has a 'navbar-' CSS class assigned already
                Method method = child.getClass().getMethod("getStyleClass", (Class[])null); // $NON-NLS-1$
                Object result = method.invoke(child, (Object[])null);
                String styleClass = (result != null) ? (String)result : null;
                if(styleClass != null && styleClass.contains((String)getProperty(PROP_NAVBARITEM_PREFIX))){
                    //navbar class already assigned, don't do anything
                    addDiv = false;
                }else{
                    //no navbar class assigned, wrap the control in a div with class 'navbar-text'
                    addDiv = true;
                    w.startElement("div", component); // $NON-NLS-1$
                    w.writeAttribute("class", (String)getProperty(PROP_NAVBARITEM_DEFAULTCLASS), null); // $NON-NLS-1$
                }
            } catch (Exception e) {
                if(BootstrapLogger.BOOTSTRAP.isErrorEnabled()) {
                    BootstrapLogger.BOOTSTRAP.errorp(this, "renderChildren", e, "Exception occured while rendering Navbar children"); // $NON-NLS-1$ $NLX-NavbarRenderer.ExceptionoccuredwhilstrenderingNa-2$
                }
            }
            
            UIComponent compChild = (UIComponent)child;
            FacesUtil.renderComponent(context, compChild);
            if(addDiv) {
                //close containing div
                w.endElement("div"); // $NON-NLS-1$
            }
        }
    }
}