/** Initializes the singleton; be sure you do this before using the extension. */
public static void init(CompilerConfiguration compilerConfig) {
assert compilerConfig != null;
if (compilerConfig.getKeepGeneratedSignatures()) {
keepGeneratedSignatures = true;
final String tmp = compilerConfig.getSignatureDirectory();
signatureDirectory = ((tmp == null) ? DEFAULT_SIG_DIR : tmp);
}
}
