Use Scott as an instrumentation backend

[dodie]

Code for the configuration:

public static Configuration getTracingConfiguration() {
		return new Configuration.Builder()
				.setTrackerClass("io.ghostwriter.GhostWriter")
				.setInclude(getPropertyConfig("GHOSTWRITER_INCLUDE", new String[] {}))
				.setExclude(getPropertyConfig("GHOSTWRITER_EXCLUDE", new String[] {}))
				.setIncludeByAnnotation(setIfPropertyExists("GHOSTWRITER_ANNOTATED_ONLY", new String[] {"io.ghostwriter.annotation.Include"}))
				.setExcludeByAnnotation(Arrays.asList("io.ghostwriter.annotation.Exclude"))
				.setExcludeMethodsByName(getPropertyConfig("GHOSTWRITER_EXCLUDE_METHODS", new String[] {"toString", "equals", "hashCode", "compareTo"}))
				.setIncludeLambdas(false)
				.setTrackReturn(getPropertyConfig("GHOSTWRITER_TRACE_RETURNING", true))
				.setTrackUnhandledException(getPropertyConfig("GHOSTWRITER_TRACE_ON_ERROR", true))
				.setTrackLocalVariableStateChange(getPropertyConfig("GHOSTWRITER_TRACE_VALUE_CHANGE", true))
				.setTrackFieldStateChanges(false)
				.setMinimumMethodLoc(getPropertyConfig("GHOSTWRITER_SHORT_METHOD_LIMIT", 0))
				.build();
	}

	private static List<String> getPropertyConfig(String propertyKey, final String[] defaultValues) {
		final String property = System.getProperty(propertyKey);

		final String[] params;
		if (property != null) {
			params = property.split(",");
		} else {
			params = defaultValues;
		}

		return Arrays.asList(params);
	}

	private static List<String> setIfPropertyExists(String propertyKey, final String[] values) {
		if (System.getProperty(propertyKey) != null) {
			return Arrays.asList(values);
		} else {
			return new ArrayList<String>();
		}
	}

	private static boolean getPropertyConfig(String propertyKey, final boolean defaultValue) {
		String propertyValue = System.getProperty(propertyKey);
		if (propertyValue != null) {
			return Boolean.parseBoolean(propertyValue);
		} else {
			return defaultValue;
		}
	}

	private static int getPropertyConfig(String propertyKey, final int defaultValue) {
		String propertyValue = System.getProperty(propertyKey);
		if (propertyValue != null) {
			return Integer.parseInt(propertyValue);
		} else {
			return defaultValue;
		}
	}