import org.geometerplus.zlibrary.core.util.ZLTTFInfoDetector; //导入依赖的package包/类
private static Map<String,File[]> getFontMap(boolean forceReload) {
	final long timeStamp = System.currentTimeMillis();
	if (forceReload && timeStamp < ourTimeStamp + 1000) {
		forceReload = false;
	}
	ourTimeStamp = timeStamp;
	if (ourFileSet == null || forceReload) {
		final HashSet<File> fileSet = new HashSet<File>();
		final FilenameFilter filter = new FilenameFilter() {
			public boolean accept(File dir, String name) {
				if (name.startsWith(".")) {
					return false;
				}
				final String lcName = name.toLowerCase();
				return lcName.endsWith(".ttf") || lcName.endsWith(".otf");
			}
		};
		final File[] fileList = new File(Paths.FontsDirectoryOption().getValue()).listFiles(filter);
		if (fileList != null) {
			fileSet.addAll(Arrays.asList(fileList));
		}
		if (!fileSet.equals(ourFileSet)) {
			ourFileSet = fileSet;
			ourFontMap = new ZLTTFInfoDetector().collectFonts(fileSet);
		}
	}
	return ourFontMap;
}