Metadata implements CreativeCommons, Geographic, HttpHeaders,
        Message, ClimateForcast, TIFF, TikaMimeKeys,
        Serializable { public String[] names() { return metadata.keySet().toArray(new String[metadata.keySet().size()]); } Metadata(); boolean isMultiValued(final Property property); boolean isMultiValued(final String name); String[] names(); String get(final String name); String get(Property property); Integer getInt(Property property); Date getDate(Property property); String[] getValues(final Property property); String[] getValues(final String name); void add(final String name, final String value); void add(final Property property, final String value); @SuppressWarnings("unchecked") void setAll(Properties properties); void set(String name, String value); void set(Property property, String value); void set(Property property, String[] values); void set(Property property, int value); void add(Property property, int value); int[] getIntValues(Property property); void set(Property property, double value); void set(Property property, Date date); void set(Property property, Calendar date); void remove(String name); int size(); int hashCode(); boolean equals(Object o); String toString();  }
@Test public void testNames() { String[] names = null; Metadata meta = new Metadata(); names = meta.names(); assertEquals(0, names.length); meta.add("name-one", "value"); names = meta.names(); assertEquals(1, names.length); assertEquals("name-one", names[0]); meta.add("name-two", "value"); names = meta.names(); assertEquals(2, names.length); }