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java.lang.Objectorg.springframework.util.CollectionUtils
public abstract class CollectionUtils
Miscellaneous collection utility methods. Mainly for internal use within the framework.
| Constructor Summary | |
|---|---|
CollectionUtils()
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| Method Summary | ||
|---|---|---|
static java.util.List<?> |
arrayToList(java.lang.Object source)
Convert the supplied array into a List. |
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static boolean |
contains(java.util.Enumeration<?> enumeration,
java.lang.Object element)
Check whether the given Enumeration contains the given element. |
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static boolean |
contains(java.util.Iterator<?> iterator,
java.lang.Object element)
Check whether the given Iterator contains the given element. |
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static boolean |
containsAny(java.util.Collection<?> source,
java.util.Collection<?> candidates)
Return true if any element in 'candidates' is contained in 'source';
otherwise returns false. |
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static boolean |
containsInstance(java.util.Collection<?> collection,
java.lang.Object element)
Check whether the given Collection contains the given element instance. |
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static java.lang.Class<?> |
findCommonElementType(java.util.Collection<?> collection)
Find the common element type of the given Collection, if any. |
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static java.lang.Object |
findFirstMatch(java.util.Collection<?> source,
java.util.Collection<?> candidates)
Return the first element in ' candidates' that is contained in 'source'. |
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static java.lang.Object |
findValueOfType(java.util.Collection<?> collection,
java.lang.Class<?>[] types)
Find a single value of one of the given types in the given Collection: searching the Collection for a value of the first type, then searching for a value of the second type, etc. |
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static
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findValueOfType(java.util.Collection<?> collection,
java.lang.Class<T> type)
Find a single value of the given type in the given Collection. |
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static boolean |
hasUniqueObject(java.util.Collection<?> collection)
Determine whether the given Collection only contains a single unique object. |
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static boolean |
isEmpty(java.util.Collection<?> collection)
Return true if the supplied Collection is null or empty. |
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static boolean |
isEmpty(java.util.Map<?,?> map)
Return true if the supplied Map is null or empty. |
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static void |
mergeArrayIntoCollection(java.lang.Object array,
java.util.Collection<java.lang.Object> collection)
Merge the given array into the given Collection. |
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static void |
mergePropertiesIntoMap(java.util.Properties props,
java.util.Map<java.lang.String,java.lang.Object> map)
Merge the given Properties instance into the given Map, copying all properties (key-value pairs) over. |
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static
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toArray(java.util.Enumeration<E> enumeration,
A[] array)
Marshal the elements from the given enumeration into an array of the given type. |
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static
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toIterator(java.util.Enumeration<E> enumeration)
Adapt an enumeration to an iterator. |
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static
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toMultiValueMap(java.util.Map<K,java.util.List<V>> map)
Adapts a Map<K, List<V>> to an MultiValueMap<K,V>. |
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static
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unmodifiableMultiValueMap(MultiValueMap<? extends K,? extends V> map)
Returns an unmodifiable view of the specified multi-value map. |
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| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public CollectionUtils()
| Method Detail |
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public static boolean isEmpty(java.util.Collection<?> collection)
true if the supplied Collection is null or empty. Otherwise, return
false.
collection - the Collection to check
public static boolean isEmpty(java.util.Map<?,?> map)
true if the supplied Map is null or empty. Otherwise, return false.
map - the Map to check
public static java.util.List<?> arrayToList(java.lang.Object source)
A null source value will be converted to an empty List.
source - the (potentially primitive) array
ObjectUtils.toObjectArray(Object)
public static void mergeArrayIntoCollection(java.lang.Object array,
java.util.Collection<java.lang.Object> collection)
array - the array to merge (may be null)collection - the target Collection to merge the array into
public static void mergePropertiesIntoMap(java.util.Properties props,
java.util.Map<java.lang.String,java.lang.Object> map)
Uses Properties.propertyNames() to even catch default properties linked into the original Properties
instance.
props - the Properties instance to merge (may be null)map - the target Map to merge the properties into
public static boolean contains(java.util.Iterator<?> iterator,
java.lang.Object element)
iterator - the Iterator to checkelement - the element to look for
true if found, false else
public static boolean contains(java.util.Enumeration<?> enumeration,
java.lang.Object element)
enumeration - the Enumeration to checkelement - the element to look for
true if found, false else
public static boolean containsInstance(java.util.Collection<?> collection,
java.lang.Object element)
Enforces the given instance to be present, rather than returning true for an equal element as well.
collection - the Collection to checkelement - the element to look for
true if found, false else
public static boolean containsAny(java.util.Collection<?> source,
java.util.Collection<?> candidates)
true if any element in 'candidates' is contained in 'source';
otherwise returns false.
source - the source Collectioncandidates - the candidates to search for
public static java.lang.Object findFirstMatch(java.util.Collection<?> source,
java.util.Collection<?> candidates)
candidates' that is contained in 'source'. If no element
in 'candidates' is present in 'source' returns null. Iteration order is
Collection implementation specific.
source - the source Collectioncandidates - the candidates to search for
null if not found
public static <T> T findValueOfType(java.util.Collection<?> collection,
java.lang.Class<T> type)
collection - the Collection to searchtype - the type to look for
null if none or more than one
such value found
public static java.lang.Object findValueOfType(java.util.Collection<?> collection,
java.lang.Class<?>[] types)
collection - the collection to searchtypes - the types to look for, in prioritized order
null if none or more
than one such value foundpublic static boolean hasUniqueObject(java.util.Collection<?> collection)
collection - the Collection to check
true if the collection contains a single reference or multiple references to the same
instance, false elsepublic static java.lang.Class<?> findCommonElementType(java.util.Collection<?> collection)
collection - the Collection to check
null if no clear common type has been found (or the collection
was empty)
public static <A,E extends A> A[] toArray(java.util.Enumeration<E> enumeration,
A[] array)
public static <E> java.util.Iterator<E> toIterator(java.util.Enumeration<E> enumeration)
enumeration - the enumeration
public static <K,V> MultiValueMap<K,V> toMultiValueMap(java.util.Map<K,java.util.List<V>> map)
Map<K, List<V>> to an MultiValueMap<K,V>.
map - the map
public static <K,V> MultiValueMap<K,V> unmodifiableMultiValueMap(MultiValueMap<? extends K,? extends V> map)
map - the map for which an unmodifiable view is to be returned.
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