com.alkacon.geranium.client.util

Class CollectionUtil

java.lang.Object

com.alkacon.geranium.client.util.CollectionUtil

public final class CollectionUtil
extends java.lang.Object

A utility class with functions for dealing with maps.

Method Summary

Methods

Modifier and Type	Method and Description
static <A> java.util.Set<A>	intersection(java.util.Set<A> first, java.util.Set<A> second) Returns the intersection of two sets without modifying the original sets.
static boolean	isEmptyOrNull(java.util.Collection<?> collection) Checks whether a collection is empty or null.
static java.util.Map<java.lang.String,java.lang.String>	parseProperties(java.lang.String text) Parses properties from a string and returns them in a map.
static <A,B> java.util.Map<A,B>	removeNullEntries(java.util.Map<A,B> map) Returns a new map with all entries of the input map except those which have a value of null.
static <A,B> void	updateMapAndRemoveNulls(java.util.Map<A,B> source, java.util.Map<A,B> target) Copies entries from one map to another and deletes those entries in the target map for which the value in the source map is null.

Methods inherited from class java.lang.Object

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

Method Detail

intersection

public static <A> java.util.Set<A> intersection(java.util.Set<A> first,
                                java.util.Set<A> second)

Returns the intersection of two sets without modifying the original sets.

Type Parameters:

A - the type of objects contained in the sets

Parameters:

first - the first set

second - the second set

Returns:

the intersection of both sets

isEmptyOrNull

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

Checks whether a collection is empty or null.

Parameters:

collection - a collection

Returns:

true if collection is null or empty.

parseProperties

public static java.util.Map<java.lang.String,java.lang.String> parseProperties(java.lang.String text)

Parses properties from a string and returns them in a map.

Parameters:

text - the text containing the properties

Returns:

the map with the parsed properties

removeNullEntries

public static <A,B> java.util.Map<A,B> removeNullEntries(java.util.Map<A,B> map)

Returns a new map with all entries of the input map except those which have a value of null.

Type Parameters:

A - the key type of the map

B - the value type of the map

Parameters:

map - the input map

Returns:

a map with all null entries removed

updateMapAndRemoveNulls

public static <A,B> void updateMapAndRemoveNulls(java.util.Map<A,B> source,
                                 java.util.Map<A,B> target)

Copies entries from one map to another and deletes those entries in the target map for which the value in the source map is null.

Type Parameters:

A - the key type of the map

B - the value type of the map

Parameters:

source - the source map

target - the target map