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bndtools.builder
There is a newer version: 7.1.0
package org.bndtools.builder;

import java.util.Formatter;

import org.eclipse.core.resources.IncrementalProjectBuilder;

public class BuildLogger {
	public static final int		LOG_FULL	= 2;
	public static final int		LOG_BASIC	= 1;
	public static final int		LOG_NONE	= 0;
	private final int			level;
	private final String		name;
	private final int			kind;
	private final long			start		= System.currentTimeMillis();
	private final StringBuilder	sb			= new StringBuilder();
	private final Formatter		formatter	= new Formatter(sb);
	private boolean				used		= false;
	private int					files		= -1;

	public BuildLogger(int level, String name, int kind) {
		this.level = level;
		this.name = name;
		this.kind = kind;
	}

	public void basic(String string) {
		basic(string, (Object[]) null);
	}

	public void basic(String string, Object... args) {
		if (level < LOG_BASIC)
			return;

		message(string, args);
	}

	public void full(String string) {
		full(string, (Object[]) null);
	}

	public void full(String string, Object... args) {
		if (level < LOG_FULL)
			return;

		message(string, args);
	}

	public boolean isEmpty() {
		return !used;
	}

	@Override
	public String toString() {
		return sb.toString();
	}

	private void message(String string, Object[] args) {
		used = true;
		if (args == null) {
			sb.append(string);
		} else {
			formatter.format(string, args);
		}
		sb.append('\n');
	}

	public String format() {
		long end = System.currentTimeMillis();
		full("Duration %.2f sec", (end - start) / 1000f);
		String kindString;
		switch (kind) {
			case IncrementalProjectBuilder.FULL_BUILD :
				kindString = "FULL";
				break;
			case IncrementalProjectBuilder.AUTO_BUILD :
				kindString = "AUTO";
				break;
			case IncrementalProjectBuilder.CLEAN_BUILD :
				kindString = "CLEAN";
				break;
			case IncrementalProjectBuilder.INCREMENTAL_BUILD :
				kindString = "INCREMENTAL";
				break;
			default :
				kindString = String.valueOf(kind);
				break;
		}

		StringBuilder top = new StringBuilder();
		try (Formatter topper = new Formatter(top)) {
			if (files > 0)
				topper.format("BUILD %s %s %d file%s built", kindString, name, files, files > 1 ? "s were" : " was");
			else
				topper.format("BUILD %s %s no build", kindString, name);
		}

		return top.append('\n')
			.append(sb)
			.toString();
	}

	public boolean isActive() {
		return level != LOG_NONE;
	}

	public void setFiles(int f) {
		files = f;
	}
}