buildconsoleproxy.java

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/**
 * Copyright (c) 2003-2007 Craig Setera
 * All Rights Reserved.
 * Licensed under the Eclipse Public License - v 1.0
 * For more information see http://www.eclipse.org/legal/epl-v10.html
 */
package eclipseme.core.console;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import org.eclipse.debug.core.IStreamListener;
import org.eclipse.debug.core.model.IStreamMonitor;

/**
 * The proxied implementation of {@link IBuildConsoleProxy}.
 * <p />
 * Copyright (c) 2003-2007 Craig Setera<br>
 * All Rights Reserved.<br>
 * Licensed under the Eclipse Public License - v 1.0<p/>
 * <br>
 * $Revision$
 * <br>
 * $Date$
 * <br>
 * @author Craig Setera
 */
public class BuildConsoleProxy implements IBuildConsoleProxy {
	public static final BuildConsoleProxy instance = new BuildConsoleProxy();
	
	private static NullOutputStream nullStream = new NullOutputStream();
	private static class NullOutputStream extends OutputStream {
		public void write(int arg0) throws IOException {
		}
	}
	
	private IBuildConsoleProxy proxy;
	private PrintWriter traceWriter;

	private BuildConsoleProxy() {	}

	/**
	 * Add a new listener to the specified console stream.
	 * 
	 * @param id
	 * @param monitor
	 */
	public void addConsoleStreamListener(String id, IStreamMonitor monitor) {
		final PrintWriter writer = getConsoleWriter(id);
		monitor.addListener(new IStreamListener() {
			public void streamAppended(String text, IStreamMonitor monitor) {
				writer.print(text);
				writer.flush();
			}
		});
		
		writer.print(monitor.getContents());
		writer.flush();
	}

	/**
	 * @see eclipseme.core.console.IBuildConsoleProxy#getConsoleWriter(java.lang.String)
	 */
	public PrintWriter getConsoleWriter(String id) {
		return (proxy == null) ? new PrintWriter(nullStream) : proxy.getConsoleWriter(id);
	}
	
	/**
	 * Print the specified information to the log output stream.
	 *
	 * @param text
	 */
	public void trace(String text) {
		if (traceWriter == null) {
			traceWriter = getConsoleWriter(ID_TRACE_STREAM);
		}
		
		traceWriter.print(text);
		traceWriter.flush();
	}
	
	/**
	 * Print the specified information to the log output stream.
	 * 
	 * @param text
	 */
	public void traceln(String text) {
		trace(text + "\n");
	}
	
	/**
	 * Set the proxy being wrapped by this proxy.
	 * 
	 * @param proxy
	 */
	public void setProxy(IBuildConsoleProxy proxy) {
		this.proxy = proxy;
		traceWriter = null;
	}
}