public synchronized String get(String parentMD5, String name) throws IOException {
		if (parentMD5 == null || parentMD5.length() != FileCache.MD5_HEXSTR_LEN) {
			throw new IOException("Bad MD5 for parent object: " + parentMD5 + ", " + name);
		}
		String key = parentMD5 + "_" + name;
		return parentMD5ObjNameToMD5Map.get(key);
	}
Retrieves a filename mapping from this cache.

@param parentMD5 the md5 string of the parent object
@param name the name of the requested object.
@return the md5 string of the requested object, or null if not in cache.
@throws IOException if missing or bad parent md5 values.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FileCacheNameIndex.java