eclipse-tools/model-transformation/plugins/org.eclipse.app4mc.transformation.log4j.configuration/src/org/eclipse/app4mc/transformation/log4j/configuration/CustomConsoleAppender.java

/**
 ********************************************************************************
 * Copyright (c) 2020 Robert Bosch GmbH and others.
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Robert Bosch GmbH - initial API and implementation
 ********************************************************************************
 */
package org.eclipse.app4mc.transformation.log4j.configuration;

import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Layout;
import org.apache.log4j.spi.LoggingEvent;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.console.ConsolePlugin;
import org.eclipse.ui.console.IConsole;
import org.eclipse.ui.console.IConsoleConstants;
import org.eclipse.ui.console.IConsoleManager;
import org.eclipse.ui.console.MessageConsole;
import org.eclipse.ui.console.MessageConsoleStream;

public class CustomConsoleAppender extends ConsoleAppender {

	public CustomConsoleAppender() {
	}

	public CustomConsoleAppender(Layout layout) {
		super(layout, SYSTEM_OUT);
	}

	  public CustomConsoleAppender(Layout layout, String target) {
		    super.setLayout(layout);
		    super.setTarget(target);
		    super.activateOptions();
		  }
	  
	private MessageConsole myConsole;

	@Override
	public void append(LoggingEvent event) {
			if (logMessageOnConsole(event) == false) {
				myConsole = findConsole("ASF SLG");
				logMessageOnConsole(event);
			}
	}
	@Override
	public synchronized void doAppend(LoggingEvent event) {
		
		if (logMessageOnConsole(event) == false) {
			myConsole = findConsole("ASF SLG");
			logMessageOnConsole(event);
		}
	}

	private boolean logMessageOnConsole(LoggingEvent event) {
		if (myConsole != null) {
			MessageConsoleStream out = myConsole.newMessageStream();
			out.println(event.getMessage().toString());
			return true;
		}
		return false;
	}


	private MessageConsole findConsole(String name) {

		openConsoleView();
		ConsolePlugin plugin = ConsolePlugin.getDefault();
		if (plugin != null) {
			IConsoleManager conMan = plugin.getConsoleManager();
			if (conMan != null) {
				IConsole[] existing = conMan.getConsoles();
				for (int i = 0; i < existing.length; i++)
					if (name.equals(existing[i].getName()))
						return (MessageConsole) existing[i];
				// no console found, so create a new one
				MessageConsole myConsole = new MessageConsole(name, null);
				conMan.addConsoles(new IConsole[] { myConsole });
				
				return myConsole;

			}

		}
		return null;
	}

	private void openConsoleView() {
		try {
			IViewPart findView = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage()
					.findView(IConsoleConstants.ID_CONSOLE_VIEW);
			if (findView == null) {
				PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage()
						.showView(IConsoleConstants.ID_CONSOLE_VIEW);
			}

		} catch (PartInitException e) {
			// TODO:Currently not logging any message for this exception
		}
	}
}