### Question:
XMLResources implements Comparator<Object> { @Pure public static String getStringIdentifier(long identifier) { return IDENTIFIER_PREFIX + Long.toString(identifier); } XMLResources(PathBuilder pathBuilder); @Override @SuppressWarnings({"checkstyle:cyclomaticcomplexity", "checkstyle:npathcomplexity"}) @Pure int compare(Object o1, Object o2); @Pure static String getStringIdentifier(long identifier); @Pure static boolean isStringIdentifier(String str); @SuppressWarnings("checkstyle:magicnumber") @Pure static long getNumericalIdentifier(String identifier); synchronized String add(long identifier, URL url, String mimeType); synchronized String add(long identifier, File file, String mimeType); synchronized String add(long identifier, byte[] rawData, String mimeType); @Inline(value = "add($1, null)") final String add(URL url); @Inline(value = "add(-1, $1, $2)") final String add(URL url, String mimeType); @Inline(value = "add($1, null)") final String add(File file); @Inline(value = "add(-1, $1, $2)") final String add(File file, String mimeType); @Inline(value = "add($1, null)") final String add(byte[] rawData); @Inline(value = "add(-1, $1, $2)") final String add(byte[] rawData, String mimeType); synchronized long computeNextIdentifier(); @Pure final long getIdentifier(URL url); @Pure final long getIdentifier(File file); @Pure final long getIdentifier(byte[] rawData); @Pure final URL getResourceURL(long identifier); @Pure @Inline(value = "getResourceFromIdentifier($1)") final Entry getResource(long identifier); synchronized void remove(URL url); synchronized void remove(File file); synchronized void remove(byte[] rawData); synchronized void remove(long identifier); @Pure Map<Long, Entry> getPairs(); synchronized void clear(); static final String IDENTIFIER_PREFIX; }### Answer:
@Test public void getStringIdentifier() { assertEquals(XMLResources.IDENTIFIER_PREFIX + "0", XMLResources.getStringIdentifier(0)); assertEquals(XMLResources.IDENTIFIER_PREFIX + "351", XMLResources.getStringIdentifier(351)); assertEquals(XMLResources.IDENTIFIER_PREFIX + "-4521", XMLResources.getStringIdentifier(-4521)); }