| /* |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed 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 com.google.gwt.logging.client; |
| |
| import com.google.gwt.safehtml.shared.annotations.SuppressIsSafeHtmlCastCheck; |
| import com.google.gwt.user.client.ui.HTML; |
| import com.google.gwt.user.client.ui.HasWidgets; |
| import com.google.gwt.user.client.ui.Label; |
| |
| import java.util.logging.Formatter; |
| import java.util.logging.Handler; |
| import java.util.logging.Level; |
| import java.util.logging.LogRecord; |
| |
| /** |
| * A handler which can log to any widget which extends the HasWidgets interface. |
| * This allows users to log to anywhere they would like in their UI - see the |
| * LogConfiguration class for an example. Note that the widget passed in must |
| * handle multiple calls to widget.add(widget) gracefully. |
| */ |
| public class HasWidgetsLogHandler extends Handler { |
| |
| private HasWidgets widgetContainer; |
| |
| public HasWidgetsLogHandler(HasWidgets container) { |
| this.widgetContainer = container; |
| setFormatter(new HtmlLogFormatter(true)); |
| setLevel(Level.ALL); |
| } |
| |
| public void clear() { |
| widgetContainer.clear(); |
| } |
| |
| @Override |
| public void close() { |
| // Do nothing |
| } |
| |
| @Override |
| public void flush() { |
| // Do nothing |
| } |
| |
| @Override |
| @SuppressIsSafeHtmlCastCheck |
| public void publish(LogRecord record) { |
| if (!isLoggable(record)) { |
| return; |
| } |
| Formatter formatter = getFormatter(); |
| String msg = formatter.format(record); |
| // We want to make sure that unescaped messages are not output as HTML to |
| // the window and the HtmlLogFormatter ensures this. If you want to write a |
| // new formatter, subclass HtmlLogFormatter and override the getHtmlPrefix |
| // and getHtmlSuffix methods. |
| if (formatter instanceof HtmlLogFormatter) { |
| widgetContainer.add(new HTML(msg)); |
| } else { |
| widgetContainer.add(new Label(msg)); |
| } |
| } |
| } |
| |