How to use

getTrimmedStringCollection

method

in

org.apache.hadoop.util.StringUtils

/**
 * 
 * @param hostEntries comma separated ip/cidr/host addresses
 */
public MachineList(String hostEntries) {
 this(StringUtils.getTrimmedStringCollection(hostEntries));
}

/**
 * Get the comma delimited values of the <code>name</code> property as
 * a collection of <code>String</code>s, trimmed of the leading and trailing whitespace.
 * If no such property is specified then empty <code>Collection</code> is returned.
 *
 * @param name property name.
 * @return property value as a collection of <code>String</code>s, or empty <code>Collection</code>
 */
public Collection<String> getTrimmedStringCollection(String name) {
 String valueString = get(name);
 if (null == valueString) {
  Collection<String> empty = new ArrayList<String>();
  return empty;
 }
 return StringUtils.getTrimmedStringCollection(valueString);
}

/**
 * Get the comma delimited values of the <code>name</code> property as
 * a collection of <code>String</code>s, trimmed of the leading and trailing whitespace.
 * If no such property is specified then empty <code>Collection</code> is returned.
 *
 * @param name property name.
 * @return property value as a collection of <code>String</code>s, or empty <code>Collection</code>
 */
public Collection<String> getTrimmedStringCollection(String name) {
  String valueString = get(name);
  if (null == valueString) {
    Collection<String> empty = new ArrayList<String>();
    return empty;
  }
  return StringUtils.getTrimmedStringCollection(valueString);
}

/**
 * Returns a list of strings from a comma-delimited configuration value.
 *
 * @param conf configuration to check
 * @param name configuration property name
 * @param defaultValue default value if no value found for name
 * @return list of strings from comma-delimited configuration value, or an
 *     empty list if not found
 */
private static List<String> getTrimmedStringList(Configuration conf,
 String name, String defaultValue) {
 String valueString = conf.get(name, defaultValue);
 if (valueString == null) {
  return new ArrayList<>();
 }
 return new ArrayList<>(StringUtils.getTrimmedStringCollection(valueString));
}

/** 
 * Get the comma delimited values of the <code>name</code> property as 
 * a collection of <code>String</code>s, trimmed of the leading and trailing whitespace.  
 * If no such property is specified then empty <code>Collection</code> is returned.
 *
 * @param name property name.
 * @return property value as a collection of <code>String</code>s, or empty <code>Collection</code> 
 */
public Collection<String> getTrimmedStringCollection(String name) {
 String valueString = get(name);
 if (null == valueString) {
  Collection<String> empty = new ArrayList<String>();
  return empty;
 }
 return StringUtils.getTrimmedStringCollection(valueString);
}

/**
 * Build ACL from the given two Strings.
 * The Strings contain comma separated values.
 *
 * @param aclString build ACL from array of Strings
 */
private void buildACL(String[] userGroupStrings) {
 users = new HashSet<String>();
 groups = new HashSet<String>();
 for (String aclPart : userGroupStrings) {
  if (aclPart != null && isWildCardACLValue(aclPart)) {
   allAllowed = true;
   break;
  }
 }
 if (!allAllowed) {      
  if (userGroupStrings.length >= 1 && userGroupStrings[0] != null) {
   users = StringUtils.getTrimmedStringCollection(userGroupStrings[0]);
  } 
  
  if (userGroupStrings.length == 2 && userGroupStrings[1] != null) {
   groups = StringUtils.getTrimmedStringCollection(userGroupStrings[1]);
   groupsMapping.cacheGroupsAdd(new LinkedList<String>(groups));
  }
 }
}

org.apache.hadoop.util.StringUtils.getTrimmedStringCollection(userListStr));
org.apache.hadoop.util.StringUtils.getTrimmedStringCollection(groupListStr));

/**
 * Parse configuration setting dfs.namenode.protected.directories to retrieve
 * the set of protected directories.
 *
 * @param protectedDirsString
 *          a comma separated String representing a bunch of paths.
 * @return a TreeSet
 */
@VisibleForTesting
static SortedSet<String> parseProtectedDirectories(
  final String protectedDirsString) {
 return parseProtectedDirectories(StringUtils
   .getTrimmedStringCollection(protectedDirsString));
}

private static void setRenameReservedMapInternal(String renameReserved) {
 Collection<String> pairs =
   StringUtils.getTrimmedStringCollection(renameReserved);
 for (String p : pairs) {
  String[] pair = StringUtils.split(p, '/', '=');
  Preconditions.checkArgument(pair.length == 2,
    "Could not parse key-value pair " + p);
  String key = pair[0];
  String value = pair[1];
  Preconditions.checkArgument(DFSUtil.isReservedPathComponent(key),
    "Unknown reserved path " + key);
  Preconditions.checkArgument(DFSUtil.isValidNameForComponent(value),
    "Invalid rename path for " + key + ": " + value);
  LOG.info("Will rename reserved path " + key + " to " + value);
  renameReservedMap.put(key, value);
 }
}

if (excludeDatanodes != null) {
 for (String host : StringUtils
   .getTrimmedStringCollection(excludeDatanodes)) {
  int idx = host.indexOf(":");
  if (idx != -1) {          

/**
 * 
 * @param hostEntries comma separated ip/cidr/host addresses
 */
public MachineList(String hostEntries) {
 this(StringUtils.getTrimmedStringCollection(hostEntries));
}

/**
 * 
 * @param hostEntries comma separated ip/cidr/host addresses
 */
public MachineList(String hostEntries) {
 this(StringUtils.getTrimmedStringCollection(hostEntries));
}

/**
 * 
 * @param hostEntries comma separated ip/cidr/host addresses
 */
public MachineList(String hostEntries) {
 this(StringUtils.getTrimmedStringCollection(hostEntries));
}

/**
 * 
 * @param hostEntries comma separated ip/cidr/host addresses
 */
public MachineList(String hostEntries) {
 this(StringUtils.getTrimmedStringCollection(hostEntries));
}

/**
 * Get the comma delimited values of property as
 * a collection of <code>String</code>s, trimmed of the leading and trailing whitespace.
 * If no such property is specified then empty <code>Collection</code> is returned.
 *
 * @return property value as a collection of <code>String</code>s, or empty <code>Collection</code>
 */
public Collection<String> getTrimmedStringCollection() {
  if (null == value) {
    return Collections.emptyList();
  }
  return StringUtils.getTrimmedStringCollection(value);
}

@Test 
public void testGetUniqueNonEmptyTrimmedStrings (){
 final String TO_SPLIT = ",foo, bar,baz,,blah,blah,bar,";
 Collection<String> col = StringUtils.getTrimmedStringCollection(TO_SPLIT);
 assertEquals(4, col.size());
 assertTrue(col.containsAll(Arrays.asList(new String[]{"foo","bar","baz","blah"})));
}

@Test 
public void testGetUniqueNonEmptyTrimmedStrings (){
 final String TO_SPLIT = ",foo, bar,baz,,blah,blah,bar,";
 Collection<String> col = StringUtils.getTrimmedStringCollection(TO_SPLIT);
 assertEquals(4, col.size());
 assertTrue(col.containsAll(Arrays.asList(new String[]{"foo","bar","baz","blah"})));
}

@Test
public void testStaticIPHostNameList()throws UnknownHostException {
 //create MachineList with a list of of Hostnames
 InetAddress addressHost1 = InetAddress.getByName("1.2.3.1");
 InetAddress addressHost4 = InetAddress.getByName("1.2.3.4");
 MachineList.InetAddressFactory addressFactory = 
  Mockito.mock(MachineList.InetAddressFactory.class);
 Mockito.when(addressFactory.getByName("host1")).thenReturn(addressHost1);
 Mockito.when(addressFactory.getByName("host4")).thenReturn(addressHost4);
 MachineList ml = new MachineList(
   StringUtils.getTrimmedStringCollection(HOST_LIST), addressFactory);
 //test for inclusion with an known IP
 assertTrue(ml.includes("1.2.3.4"));
 //test for exclusion with an unknown IP
 assertFalse(ml.includes("1.2.3.5"));
}

 @Test
 public void testGetCollection() {
  //create MachineList with a mix of ip addresses , hostnames and ip ranges
  MachineList ml = new MachineList(HOSTNAME_IP_CIDR_LIST);

  Collection<String> col = ml.getCollection();
  //test getCollectionton to return the full collection
  assertEquals(7,ml.getCollection().size());

  for (String item:StringUtils.getTrimmedStringCollection(HOSTNAME_IP_CIDR_LIST)) {
   assertTrue(col.contains(item));
  }
 }
}

 @Test
 public void testGetCollection() {
  //create MachineList with a mix of ip addresses , hostnames and ip ranges
  MachineList ml = new MachineList(HOSTNAME_IP_CIDR_LIST);

  Collection<String> col = ml.getCollection();
  //test getCollectionton to return the full collection
  assertEquals(7,ml.getCollection().size());

  for (String item:StringUtils.getTrimmedStringCollection(HOSTNAME_IP_CIDR_LIST)) {
   assertTrue(col.contains(item));
  }
 }
}