org.incava.ijdk.util

Class CollectionExt

java.lang.Object

org.incava.ijdk.lang.ObjectExt

org.incava.ijdk.util.CollectionExt

Direct Known Subclasses:

ListExt

public class CollectionExt
extends ObjectExt

Constructor Summary

Constructors

Constructor and Description
CollectionExt()

Method Summary

Modifier and Type	Method and Description
static <Type> boolean	any(java.util.Collection<Type> coll) Returns whether there are any elements in coll, which can be null.
static <Type> boolean	contains(java.util.Collection<Type> coll, Type val) Returns whether the collection (if not null) contains the given value.
static <Type> boolean	hasAll(java.util.Collection<Type> src, java.util.Collection<Type> tgt) Returns whether all elements in tgt are in src.
static <Type> boolean	hasAny(java.util.Collection<Type> src, java.util.Collection<Type> tgt) Returns whether any element in tgt is in src.
static <Type> java.util.Set<Type>	intersection(java.util.Collection<Type>... colls) Returns a list of the elements in common.
static <Type> java.util.Set<Type>	intersection(java.util.Collection<Type> a, java.util.Collection<Type> b) Returns a list of the elements in common.

Methods inherited from class org.incava.ijdk.lang.ObjectExt

areEqual, compare, equal, isEmpty, isFalse, isNotNull, isNull, isTrue

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionExt

public CollectionExt()

Method Detail

intersection

public static <Type> java.util.Set<Type> intersection(java.util.Collection<Type> a,
                                                      java.util.Collection<Type> b)

Returns a list of the elements in common.

intersection

@SafeVarargs
public static <Type> java.util.Set<Type> intersection(java.util.Collection<Type>... colls)

Returns a list of the elements in common.

contains

public static <Type> boolean contains(java.util.Collection<Type> coll,
                                      Type val)

Returns whether the collection (if not null) contains the given value. Returns false if coll is null.

hasAll

public static <Type> boolean hasAll(java.util.Collection<Type> src,
                                    java.util.Collection<Type> tgt)

Returns whether all elements in tgt are in src. If src or tgt is null, false is returned.

hasAny

public static <Type> boolean hasAny(java.util.Collection<Type> src,
                                    java.util.Collection<Type> tgt)

Returns whether any element in tgt is in src. If src or tgt is null, false is returned.

any

public static <Type> boolean any(java.util.Collection<Type> coll)

Returns whether there are any elements in coll, which can be null.