org.alfresco.solr.utils

Class Utils

java.lang.Object

org.alfresco.solr.utils.Utils

public abstract class Utils
extends Object

SearchServices Booch utilities.

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and Description
static Double	doubleOrNull(String value)
static boolean	isNotNullAndNotEmpty(String value) Returns true if the input string is not null and it is not empty.
static boolean	isNullOrEmpty(String value) Returns true if the input string is null or is empty.
static <T> Collection<T>	notNullOrEmpty(Collection<T> values) Returns the same input collection if that is not null, otherwise a new empty collection.
static <T> List<T>	notNullOrEmpty(List<T> values) Returns the same input list if that is not null, otherwise a new empty list.
static void	silentyClose(Closeable resource) Silently closes the given Closeable resource without raising any exception.
static boolean	startsWithLanguageMarker(String value) Returns true if the first character of the input string is the locale marker character.
static Integer	toIntOrNull(String value) Converts the given input in an Integer, otherwise it returns null.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Utils

public Utils()

Method Detail

notNullOrEmpty

public static <T> Collection<T> notNullOrEmpty(Collection<T> values)

Returns the same input collection if that is not null, otherwise a new empty collection. Provides a safe way for iterating over a returned collection (which could be null).

Type Parameters:

T - the collection type.

Parameters:

values - the collection.

Returns:

the same input collection if that is not null, otherwise a new empty collection.

notNullOrEmpty

public static <T> List<T> notNullOrEmpty(List<T> values)

Returns the same input list if that is not null, otherwise a new empty list. Provides a safe way for iterating over a returned list (which could be null).

Type Parameters:

T - the list elements type.

Parameters:

values - the input list.

Returns:

the same input list if that is not null, otherwise a new empty list.

toIntOrNull

public static Integer toIntOrNull(String value)

Converts the given input in an Integer, otherwise it returns null.

Parameters:

value - the numeric string.

Returns:

the corresponding Integer or null in case the input is NaN.

silentyClose

public static void silentyClose(Closeable resource)

Silently closes the given Closeable resource without raising any exception. This utility method is specifically useful when we have to close a resource in a lamba statement: since the close() method could throw an IOException the compiler requires an enclosing try / catch block which makes the code less readable.

try { if (resource != null) resource.close } catch (IOException exception) { ... }

In these contexts a call to this method reduces the amount of code needed:

silentlyClose(resource);

Parameters:

resource - the Closeable resource we want to silently close.

isNullOrEmpty

public static boolean isNullOrEmpty(String value)

Returns true if the input string is null or is empty. Note whitespaces are not considered, so if a string contains only whitespaces, it is considered empty.

Parameters:

value - the input string.

Returns:

true if the input string is null or is empty.

isNotNullAndNotEmpty

public static boolean isNotNullAndNotEmpty(String value)

Returns true if the input string is not null and it is not empty. Note whitespaces are not considered, so if a string contains only whitespaces, it is considered empty.

Parameters:

value - the input string.

Returns:

true if the input string is not null and it is not empty.

startsWithLanguageMarker

public static boolean startsWithLanguageMarker(String value)

Returns true if the first character of the input string is the locale marker character.

Parameters:

value - the input string.

Returns:

true true if the first character of the input string is the locale marker character.

doubleOrNull

public static Double doubleOrNull(String value)