import javax.faces.component.UIMessage; //导入依赖的package包/类
/**
 * Walk the component tree branch built by the composite component and locate the input container elements.
 *
 * @return a composite object of the input container elements
 */
protected InputContainerElements scan(final UIComponent component, InputContainerElements elements,
                                      final FacesContext context) {
    if (elements == null) {
        elements = new InputContainerElements();
    }

    // NOTE we need to walk the tree ignoring rendered attribute because it's condition
    // could be based on what we discover
    if ((elements.getLabel() == null) && (component instanceof HtmlOutputLabel)) {
        elements.setLabel((HtmlOutputLabel) component);
    } else if (component instanceof EditableValueHolder) {
        elements.registerInput((EditableValueHolder) component, getDefaultValidator(context), context);
    } else if (component instanceof UIMessage) {
        elements.registerMessage((UIMessage) component);
    }
    // may need to walk smarter to ensure "element of least suprise"
    for (UIComponent child : component.getChildren()) {
        scan(child, elements, context);
    }

    return elements;
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
	// Note our complete disregard for class cast and null exceptions....
	UIMessage uiMessage = (UIMessage)component;
	String clientId = uiMessage.findComponent(uiMessage.getFor()).getClientId(context);

	Iterator iter = context.getMessages(clientId);
	if (iter.hasNext()) {
		// Just do the first one.
		FacesMessage message = (FacesMessage)iter.next();
		renderMessage(context, component, message);
	}
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
/**
 * Build a faces message.
 *
 * @param label
 *            the label to display.
 * @param uiMessage
 *            the ui message on which displaying message.
 */
public void message(final UIMessage uiMessage, final IMessageLabel label) {
    final String msg = this.messageBundle.getMessage(label);
    final FacesMessage.Severity severity = getFacesSeverity(label
            .getSeverity());
    if (!getFacesContext().isValidationFailed()
            && (isSeverityError(severity) || isSeverityFatal(severity))) {
        getFacesContext().validationFailed();
    }
    message(uiMessage, severity, msg);
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
public List<UIMessage> getMessages() {
    return messages;
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
public void registerMessage(final UIMessage message) {
    messages.add(message);
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
/**
 * used with {@link BooleanPropertyDefaultTest#getPrimitiveDefaultSkips(FacesSharableRegistry)}
 * @return
 */
public static Object[] getUIMessageShowDetailSkip() {
	return new Object[]{"showDetail", UIMessage.class, true};
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
/**
 * Build an info faces message.
 *
 * @param uiMessage
 *            the ui message on which displaying message.
 * @param message
 *            the message to display.
 */
private void info(final UIMessage uiMessage, final String message) {
    message(uiMessage, FacesMessage.SEVERITY_INFO, message);
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
/**
 * Build a warn faces message.
 *
 * @param uiMessage
 *            the ui message on which displaying message.
 * @param message
 *            the message to display.
 */
private void warn(final UIMessage uiMessage, final String message) {
    message(uiMessage, FacesMessage.SEVERITY_WARN, message);
}
 

import javax.faces.component.UIMessage; //导入依赖的package包/类
/**
 * Build an error faces message.
 *
 * @param uiMessage
 *            the ui message on which displaying message.
 * @param message
 *            the message to display.
 */
private void error(final UIMessage uiMessage, final String message) {
    message(uiMessage, FacesMessage.SEVERITY_ERROR, message);
}