How to use

getStringCollection

method

in

org.apache.hadoop.util.StringUtils

/**
 * Returns a collection of strings.
 * @param str comma separated string values
 * @return an <code>ArrayList</code> of string values
 */
public static Collection<String> getStringCollection(String str){
 String delim = ",";
 return getStringCollection(str, delim);
}

/**
 * Get the comma delimited values of the <code>name</code> property as
 * a collection of <code>String</code>s.
 * If no such property is specified then empty collection is returned.
 * <p>
 * This is an optimized version of {@link #getStrings(String)}
 *
 * @param name property name.
 * @return property value as a collection of <code>String</code>s.
 */
public Collection<String> getStringCollection(String name) {
 String valueString = get(name);
 return StringUtils.getStringCollection(valueString);
}

/**
 * Get the comma delimited values of the <code>name</code> property as
 * a collection of <code>String</code>s.
 * If no such property is specified then empty collection is returned.
 * <p>
 * This is an optimized version of {@link #getStrings(String)}
 *
 * @param name property name.
 * @return property value as a collection of <code>String</code>s.
 */
public Collection<String> getStringCollection(String name) {
  String valueString = get(name);
  return StringUtils.getStringCollection(valueString);
}

/** 
 * Get the comma delimited values of the <code>name</code> property as 
 * a collection of <code>String</code>s.  
 * If no such property is specified then empty collection is returned.
 * <p>
 * This is an optimized version of {@link #getStrings(String)}
 * 
 * @param name property name.
 * @return property value as a collection of <code>String</code>s. 
 */
public Collection<String> getStringCollection(String name) {
 String valueString = get(name);
 return StringUtils.getStringCollection(valueString);
}

/**
 * Returns an arraylist of strings.
 * @param str the string values
 * @param delim delimiter to separate the values
 * @return the arraylist of the separated string values
 */
public static String[] getStrings(String str, String delim){
 Collection<String> values = getStringCollection(str, delim);
 if(values.size() == 0) {
  return null;
 }
 return values.toArray(new String[values.size()]);
}

/**
 * From a string which columns names (including hive column), return a list
 * of string columns
 *
 * @param columns comma separated list of columns
 * @return list with virtual columns removed
 */
public static List<String> getColumnNames(final String columns) {
 return (List<String>) VirtualColumn.
   removeVirtualColumns(StringUtils.getStringCollection(columns));
}

/**
 * From a string which columns names (including hive column), return a list
 * of string columns
 *
 * @param columns comma separated list of columns
 * @return list with virtual columns removed
 */
public static List<String> getColumnNames(final String columns) {
 return (List<String>) VirtualColumn.
   removeVirtualColumns(StringUtils.getStringCollection(columns));
}

private void parseStaticMapping(Configuration conf) {
 String staticMapping = conf.get(
   CommonConfigurationKeys.HADOOP_USER_GROUP_STATIC_OVERRIDES,
   CommonConfigurationKeys.HADOOP_USER_GROUP_STATIC_OVERRIDES_DEFAULT);
 Collection<String> mappings = StringUtils.getStringCollection(
   staticMapping, ";");
 Map<String, List<String>> staticUserToGroupsMap =
   new HashMap<String, List<String>>();
 for (String users : mappings) {
  Collection<String> userToGroups = StringUtils.getStringCollection(users,
    "=");
  if (userToGroups.size() < 1 || userToGroups.size() > 2) {
   throw new HadoopIllegalArgumentException("Configuration "
     + CommonConfigurationKeys.HADOOP_USER_GROUP_STATIC_OVERRIDES
     + " is invalid");
  }
  String[] userToGroupsArray = userToGroups.toArray(new String[userToGroups
    .size()]);
  String user = userToGroupsArray[0];
  List<String> groups = Collections.emptyList();
  if (userToGroupsArray.length == 2) {
   groups = (List<String>) StringUtils
     .getStringCollection(userToGroupsArray[1]);
  }
  staticUserToGroupsMap.put(user, groups);
 }
 staticMapRef.set(
   staticUserToGroupsMap.isEmpty() ? null : staticUserToGroupsMap);
}

/**
 * Parses a string representation of an ACL spec into a list of AclEntry
 * objects. Example: "user::rwx,user:foo:rw-,group::r--,other::---"
 * The expected format of ACL entries in the string parameter is the same
 * format produced by the {@link #toStringStable()} method.
 * 
 * @param aclSpec
 *          String representation of an ACL spec.
 * @param includePermission
 *          for setAcl operations this will be true. i.e. AclSpec should
 *          include permissions.<br>
 *          But for removeAcl operation it will be false. i.e. AclSpec should
 *          not contain permissions.<br>
 *          Example: "user:foo,group:bar"
 * @return Returns list of {@link AclEntry} parsed
 */
public static List<AclEntry> parseAclSpec(String aclSpec,
  boolean includePermission) {
 List<AclEntry> aclEntries = new ArrayList<AclEntry>();
 Collection<String> aclStrings = StringUtils.getStringCollection(aclSpec,
   ",");
 for (String aclStr : aclStrings) {
  AclEntry aclEntry = parseAclEntry(aclStr, includePermission);
  aclEntries.add(aclEntry);
 }
 return aclEntries;
}

/**
 * Returns a collection of strings.
 * @param str comma seperated string values
 * @return an <code>ArrayList</code> of string values
 */
public static Collection<String> getStringCollection(String str){
 String delim = ",";
 return getStringCollection(str, delim);
}

/**
 * Returns a collection of strings.
 * @param str comma seperated string values
 * @return an <code>ArrayList</code> of string values
 */
public static Collection<String> getStringCollection(String str){
 String delim = ",";
 return getStringCollection(str, delim);
}

/**
 * Returns a collection of strings.
 * @param str comma seperated string values
 * @return an <code>ArrayList</code> of string values
 */
public static Collection<String> getStringCollection(String str) {
 String delim = ",";
 return getStringCollection(str, delim);
}

/**
 * Split a classpath. This uses the local path separator so MUST NOT
 * be used to work with remote classpaths
 * @param localpath local path
 * @return a splite
 */
public Collection<String> splitClasspath(String localpath) {
 String separator = System.getProperty("path.separator");
 return StringUtils.getStringCollection(localpath, separator);
}

/**
 * {@inheritDoc}
 */
@Override
public List<String> getColumns(final String columns) {
 final List<String> result = (List<String>) StringUtils.getStringCollection(columns);
 result.removeAll(virtualColumns);
 return result;
}

/**
 * Returns an arraylist of strings.
 * @param str the comma seperated string values
 * @return the arraylist of the comma seperated string values
 */
public static String[] getStrings(String str){
 Collection<String> values = getStringCollection(str);
 if(values.size() == 0) {
  return null;
 }
 return values.toArray(new String[values.size()]);
}

/**
 * Returns an arraylist of strings.
 * @param str the comma seperated string values
 * @return the arraylist of the comma seperated string values
 */
public static String[] getStrings(String str){
 Collection<String> values = getStringCollection(str);
 if(values.size() == 0) {
  return null;
 }
 return values.toArray(new String[values.size()]);
}

/**
 * Returns an arraylist of strings.
 * @param str the comma seperated string values
 * @return the arraylist of the comma seperated string values
 */
public static String[] getStrings(String str){
 Collection<String> values = getStringCollection(str);
 if(values.size() == 0) {
  return null;
 }
 return values.toArray(new String[values.size()]);
}

/**
 * Returns an arraylist of strings.
 * @param str the comma seperated string values
 * @return the arraylist of the comma seperated string values
 */
public static String[] getStrings(String str){
 Collection<String> values = getStringCollection(str);
 if(values.size() == 0) {
  return null;
 }
 return values.toArray(new String[values.size()]);
}

/**
 * From a string which columns names (including hive column), return a list
 * of string columns
 *
 * @param columns comma separated list of columns
 * @return list with virtual columns removed
 */
private static List<String> getColumnNames(final String columns) {
 return (List<String>) VirtualColumn.
   removeVirtualColumns(StringUtils.getStringCollection(columns));
}

private void retrieveAvailableZoneList() throws IOException {
  if (availableZoneIDs != null){
    return;
  }
  Properties props = UDFContext.getUDFContext().getUDFProperties(PigImplConstants.PIG_DATETIME_ZONES_LIST.getClass());
  Collection<String> zoneList = StringUtils.getStringCollection(props.getProperty(PigImplConstants.PIG_DATETIME_ZONES_LIST));
  if (zoneList == null || zoneList.size() == 0){
    throw new IOException("Datetime zone information not set");
  }
  availableZoneIDs = new ArrayList<>(zoneList);
}