Package lumis.util.collections

Class Collections

java.lang.Object

lumis.util.collections.Collections

public abstract class Collections
extends java.lang.Object

Collection utilities methods.

Since:

8.1.0

Version:

$Revision: 25808 $ $Date: 2023-07-04 15:20:55 -0300 (Tue, 04 Jul 2023) $

Method Summary

Modifier and Type	Method	Description
static boolean	isNullOrEmpty(java.util.Collection<?> collection)	Returns whether the given collection is null or empty.
static <Type> java.lang.String	stringify(java.util.Collection<Type> collection, java.lang.String prefix, java.lang.String suffix, boolean includePrefixAndSuffixOnlyIfCollectionNotEmpty, java.lang.String separator, IStringify<Type> stringify)	Creates a string representation of the given collection, using its values.
static <Type> java.lang.String	stringify(java.util.Collection<Type> collection, java.lang.String prefix, java.lang.String suffix, java.lang.String separator, IStringify<Type> stringify)	Creates a string representation of the given collection, using its values.
static <Type> java.lang.String	stringify(java.util.Collection<Type> collection, java.lang.String separator, IStringify<Type> stringify)	Creates a string representation of the given collection, using its values.
static <Type> java.lang.String	stringify(java.util.Collection<Type> collection, IStringify<Type> stringify)	Creates a string representation of the given collection, using its values.
static <From,To> java.util.Collection<To>	transform(java.util.Collection<From> original, Transformer<From,To> transformer)	Returns a new collection using the given transformer to transform the items.
static <T> java.util.Collection<T>	union(java.util.Collection<T>... cs)	Returns the union of the given collections.

Methods inherited from class java.lang.Object

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

Method Detail

transform

public static <From,To> java.util.Collection<To> transform(java.util.Collection<From> original,
                                                                 Transformer<From,To> transformer)
                                                          throws PortalException

Returns a new collection using the given transformer to transform the items.

Parameters:

original - the original collection.

transformer - the transformed to be used.

Returns:

a new collection using the given transformer to transform the items.

Throws:

PortalException

Since:

8.1.0

stringify

public static <Type> java.lang.String stringify(java.util.Collection<Type> collection,
                                                IStringify<Type> stringify)
                                         throws PortalException

Creates a string representation of the given collection, using its values. By convention, does not check whether the given stringify has returned null before concatenating to the result string.

Parameters:

collection - the collection.

stringify - the stringfy to be used to convert values in strings.

Returns:

the created string.

Throws:

PortalException

Since:

9.0.0

stringify

public static <Type> java.lang.String stringify(java.util.Collection<Type> collection,
                                                java.lang.String separator,
                                                IStringify<Type> stringify)
                                         throws PortalException

Creates a string representation of the given collection, using its values. By convention, does not check whether the given stringify has returned null before concatenating to the result string.

Parameters:

collection - the collection.

separator - the separator to use between the entries of the map.

stringify - the stringfy to be used to convert values in strings.

Returns:

the created string.

Throws:

PortalException

Since:

9.0.0

stringify

public static <Type> java.lang.String stringify(java.util.Collection<Type> collection,
                                                java.lang.String prefix,
                                                java.lang.String suffix,
                                                java.lang.String separator,
                                                IStringify<Type> stringify)
                                         throws PortalException

Creates a string representation of the given collection, using its values. By convention, does not check whether the given stringify has returned null before concatenating to the result string.

Parameters:

collection - the collection.

prefix - the prefix to be appended in final string.

suffix - the suffix to be appended in final string.

separator - the separator to use between the entries of the map.

stringify - the stringfy to be used to convert values in strings.

Returns:

the created string.

Throws:

PortalException

Since:

9.0.0

stringify

public static <Type> java.lang.String stringify(java.util.Collection<Type> collection,
                                                java.lang.String prefix,
                                                java.lang.String suffix,
                                                boolean includePrefixAndSuffixOnlyIfCollectionNotEmpty,
                                                java.lang.String separator,
                                                IStringify<Type> stringify)
                                         throws PortalException

Creates a string representation of the given collection, using its values. By convention, does not check whether the given stringify has returned null before concatenating to the result string.

Parameters:

collection - the collection.

prefix - the prefix to be appended in final string.

suffix - the suffix to be appended in final string.

includePrefixAndSuffixOnlyIfCollectionNotEmpty - indicates whether prefix and suffix should be added only if the given collection is not empty.

separator - the separator to use between the entries of the map.

stringify - the stringfy to be used to convert values in strings.

Returns:

the created string.

Throws:

PortalException

Since:

9.0.0

union

@SafeVarargs
public static <T> java.util.Collection<T> union(java.util.Collection<T>... cs)

Returns the union of the given collections.

Parameters:

cs - the collections.

Returns:

the union of the given collections.

Since:

10.2.0

isNullOrEmpty

public static boolean isNullOrEmpty(java.util.Collection<?> collection)

Returns whether the given collection is null or empty.

Parameters:

collection - the collection

Returns:

whether the given collection is null or empty.

Since:

16.0.0