public static MethodType tMethod(String signature) {
		int hash = signature.hashCode();
		Iterator iter = methodHash.iterateHashCode(hash);
		while (iter.hasNext()) {
			MethodType methodType = (MethodType) iter.next();
			if (methodType.getTypeSignature().equals(signature))
				return methodType;
		}
		MethodType methodType = new MethodType(signature);
		methodHash.put(hash, methodType);
		return methodType;
	}