if (fRootPath == null) {
				int index = Integer.MAX_VALUE;
				for (Enumeration entries = zip.entries(); entries.hasMoreElements(); ) {
					entry = (ZipEntry) entries.nextElement();
					int newIndex = entry.getName().indexOf(name);
					if (newIndex != -1) {
						index = Math.min(index, newIndex);
						savedEntry = entry;
					}
				}
				if (savedEntry != null) {
					if (index == 0) {
						fRootPath = IPackageFragmentRoot.DEFAULT_PACKAGEROOT_PATH;
					} else {
						fRootPath = savedEntry.getName().substring(0, index - 1);
					}
				} else {
					return null;
				}
			}
			if (fRootPath != null && !fRootPath.equals(IPackageFragmentRoot.DEFAULT_PACKAGEROOT_PATH)) {
				fullName = fRootPath + '/' + name;
			} else {
				fullName = name;
			}