Java FacesContext.getMessages方法代碼示例

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
/**
 * Remove the messages that are not associated with any particular component
 * from the faces context and store them to the user's session.
 *
 * @return the number of removed messages.
 */
private int saveMessages(FacesContext facesContext) {
	// remove messages from the context
	List<FacesMessage> messages = new ArrayList<FacesMessage>();
	for(Iterator<FacesMessage> i = facesContext.getMessages(null); i.hasNext(); ) {
		messages.add(i.next());
		i.remove();
	}
	// store them in the session
	if(messages.size() == 0) {
		return 0;
	}
	Map<String, Object> sessionMap = facesContext.getExternalContext().getSessionMap();
	// if there already are messages
	@SuppressWarnings("unchecked")
	List<FacesMessage> existingMessages = (List<FacesMessage>) sessionMap.get(sessionToken);
	if(existingMessages != null) {
		existingMessages.addAll(messages);
	}
	else {
		sessionMap.put(sessionToken, messages); // if these are the first messages
	}

	return messages.size();
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
/**
 * Substitute the faces messages that are not associated with a particular
 * component by the saved messages from the MESSAGEHOLDERBEAN.
 * 
 * @return the number of removed messages.
 */
private void restoreMessages(FacesContext facesContext) {

    MessageHolderBean bean = ui.findMessageHolderBean();
    Set<MessageWithClientId> messages = bean.getMessages();

    // remove global messages in facesContext
    Set<FacesMessage> facesContextMessages = new HashSet<FacesMessage>();
    for (Iterator<FacesMessage> i = facesContext.getMessages(null); i
            .hasNext();) {
        FacesMessage msg = i.next();
        facesContextMessages.add(msg);
        i.remove();
    }

    // add saved messages if not yet existing
    if (messages != null && messages.size() > 0) {
        for (MessageWithClientId message : messages) {
            if (!facesContextMessages.contains(message.getMessage()))
                facesContext.addMessage(message.getClientId(),
                        message.getMessage());
        }
        bean.resetMessages();
    }
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
public static boolean replaceMessageInListIfExisting(String oldKey,
        Object[] oldParams, String newKey, Object[] newParams) {

    FacesContext fc = FacesContext.getCurrentInstance();
    String oldText = JSFUtils.getText(oldKey, oldParams);
    String newText = JSFUtils.getText(newKey, newParams);

    for (Iterator<FacesMessage> i = fc.getMessages(); i.hasNext();) {
        FacesMessage fm = i.next();
        if (fm.getDetail().equals(oldText)) {
            fm.setDetail(newText);
            fm.setSummary(newText);
            return true;
        }
    }
    return false;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
@SuppressWarnings("unchecked")
protected void _renderGlobalMessages(
  FacesContext     context,
  RenderingContext rc,
  UIComponent      component,
  FacesBean        bean
  ) throws IOException
{
  ResponseWriter writer = context.getResponseWriter();

  // Get all messages without and id
  Iterator<FacesMessage> msgIter = context.getMessages(null);
  while (msgIter.hasNext())
  {
    FacesMessage msg = msgIter.next();

    writer.startElement("li", null);

    String text = MessageUtils.getGlobalMessage(rc, msg.getSummary(), msg.getDetail());
    renderPossiblyFormattedText(context, text);

    writer.endElement("li");
  }
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
@SuppressWarnings("unchecked")
public static FacesMessage getFacesMessage(
  FacesContext context,
  String       clientId)
{
  if (clientId != null)
  {
    Iterator<FacesMessage> messages = context.getMessages(clientId);
    if (messages.hasNext())
    {
      return messages.next();
    }
  }

  return null;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
/**
 * Gets the messages with the given client identifier from the faces context
 * .
 * 
 * @param clientId
 *            The client identifier to filter for.
 * @param facesContext
 *            The faces context.
 * @return The messsage with the given id.
 */
private List<MessageWithClientId> getMessagesForClientId(String clientId,
        FacesContext facesContext) {
    List<MessageWithClientId> md = new ArrayList<MessageWithClientId>();
    for (Iterator<FacesMessage> it = facesContext.getMessages(clientId); it
            .hasNext();) {
        FacesMessage msg = it.next();
        md.add(new MessageWithClientId(clientId, msg));
        it.remove();
    }
    return md;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
public static boolean hasErrors(FacesContext fc) {
    for (Iterator<FacesMessage> i = fc.getMessages(); i.hasNext();) {
        FacesMessage m = i.next();
        if (FacesMessage.SEVERITY_ERROR == m.getSeverity()) {
            return true;
        }
    }
    return false;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
public static boolean hasWarnings(FacesContext fc) {
    for (Iterator<FacesMessage> i = fc.getMessages(); i.hasNext();) {
        FacesMessage m = i.next();
        if (FacesMessage.SEVERITY_WARN == m.getSeverity()) {
            return true;
        }
    }
    return false;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
private boolean containsMessageInList(FacesContext fc, String msg) {
    for (Iterator<FacesMessage> i = fc.getMessages(); i.hasNext();) {
        if (i.next().getDetail().contains(msg)) {
            return true;
        }
    }
    return false;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
/**
 * Returns true if there is more than one FacesMessage queued.
 * @param context
 * @param globalOnly Count only global messages
 * @return true if multiple messages queued.
 */
@SuppressWarnings("unchecked")
public static boolean multipleMessagesQueued(
    FacesContext context,
    boolean globalOnly)
{
  Iterator<FacesMessage> msgIter = null;
  if (globalOnly)
    // All messages without id's
    msgIter = context.getMessages(null);
  else
    // All messages, inc those without id's
    msgIter = context.getMessages();
  
  if (msgIter.hasNext())
  {
    // At least one message
    msgIter.next();

    if (msgIter.hasNext())
    {
      // At least two messages
      return true;
    }
  }
  return false;
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
@SuppressWarnings("unchecked")
protected void _renderComponentMessages(
  FacesContext     context,
  RenderingContext rc,
  UIComponent      component,
  FacesBean        bean
  ) throws IOException
{
  ResponseWriter writer = context.getResponseWriter();

  Iterator<String> idIter = context.getClientIdsWithMessages();
  while (idIter.hasNext())
  {
    String id = idIter.next();

    // Skip global messages
    if (id == null)
      continue;

    Iterator<FacesMessage> msgIter = context.getMessages(id);
    while (msgIter.hasNext())
    {
      FacesMessage msg = msgIter.next();

      writer.startElement("li", null);

      _renderMessageAnchor(context, rc, msg, id);

      String text = MessageUtils.getClientMessage(rc, msg.getSummary(), msg.getDetail());

      // If the first two characters are "- ", assume it's due to af_messages.LIST_FORMAT_private;
      // alternatively, we could change the value of this key in CoreBundle.xrts, located in:
      // trinidad-impl\src\main\xrts\org\apache\myfaces\trinidadinternal\renderkit\core\resource
      // If the label is null, then we don't want to render the "- ".
      boolean isNullLabel = false;
      if (msg instanceof LabeledFacesMessage)
      {
        LabeledFacesMessage labeledMsg = (LabeledFacesMessage)msg;
        String labelString = labeledMsg.getLabelAsString(context);
        if (labelString == null || labelString.length() == 0)
          isNullLabel = true;
      }
      else
      {
        isNullLabel = true;
      }

      if (isNullLabel && text.charAt(0) == '-' && text.charAt(1) == ' ')
        text = text.substring(2);

      renderPossiblyFormattedText(context, text);

      writer.endElement("li");
    }
  }
}
 

import javax.faces.context.FacesContext; //導入方法依賴的package包/類
/**
 * Checks if a message is already added to FacesContext messages list.
 * 
 * @param fc
 *            FacesContext instance
 * 
 * @param msg
 *            the message
 * @return Returns true if the msg exists, otherwise false.
 */
public static boolean existMessageInList(FacesContext fc, String msg) {
    for (Iterator<FacesMessage> i = fc.getMessages(); i.hasNext();) {
        if (i.next().getDetail().equals(msg)) {
            return true;
        }
    }
    return false;
}