LogViewComponentFactory.java

package org.obo.annotation.view;

import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;
import org.bbop.framework.AbstractComponentFactory;

import ca.odell.glazedlists.BasicEventList;
import ca.odell.glazedlists.EventList;

public class LogViewComponentFactory extends AbstractComponentFactory<LogViewComponent> {

	private final LogViewAppender appender = new LogViewAppender();

	public LogViewComponentFactory() {
		super();
		this.appender.setThreshold(Level.INFO);
		Logger.getRootLogger().addAppender(this.appender);
	}

	@Override
	public LogViewComponent doCreateComponent(String id) {
		return new LogViewComponent(id, this.appender);
	}

	@Override
	public FactoryCategory getCategory() {
		return FactoryCategory.INFO;
	}

	@Override
	public String getID() {
		return "log_view_component";
	}

	@Override
	public String getName() {
		return "Error Log";
	}

	@Override
	public boolean isSingleton() {
		return true;
	}

	/**
	 * This appender just collects all received log messages into an EventList.
	 * @author jim
	 */
	public static class LogViewAppender extends AppenderSkeleton {

		private final EventList<LoggingEvent> messages = new BasicEventList<LoggingEvent>();

		@Override
		protected void append(LoggingEvent event) {
			this.messages.add(event);
		}

		public EventList<LoggingEvent> getMessages() {
			return this.messages;
		}

		@Override
		public void close() {}

		@Override
		public boolean requiresLayout() {
			return false;
		}

	}

}