Package one.microstream.collections.types

Interface XGettingCollection<E>

Type Parameters:
E - type of contained elements
All Superinterfaces:
CapacityCarrying, Copyable, ExtendedCollection<E>, Iterable<E>, Sized, XIterable<E>, XJoinable<E>
All Known Subinterfaces:
XAddGetCollection<E>, XAddGetMap<K,​V>, XAddGetSet<E>, XBag<E>, XBasicEnum<E>, XBasicList<E>, XBasicSequence<E>, XBasicTable<K,​V>, XBasicTable.Keys<K,​V>, XBasicTable.Values<K,​V>, XChart<K,​V>, XChart.Keys<K,​V>, XChart.Values<K,​V>, XCollection<E>, XDecreasingEnum<E>, XDecreasingList<E>, XDecreasingSequence<E>, XEnum<E>, XGettingBag<E>, XGettingEnum<E>, XGettingList<E>, XGettingMap<K,​V>, XGettingMap.Keys<K,​V>, XGettingMap.Values<K,​V>, XGettingSequence<E>, XGettingSet<E>, XGettingSortation<E>, XGettingTable<K,​V>, XGettingTable.Keys<K,​V>, XGettingTable.Values<K,​V>, XImmutableBag<E>, XImmutableCollection<E>, XImmutableEnum<E>, XImmutableEnum.Factory<E>, XImmutableList<E>, XImmutableMap<K,​V>, XImmutableMap.Keys<K,​V>, XImmutableMap.Values<K,​V>, XImmutableSequence<E>, XImmutableSet<E>, XImmutableTable<K,​V>, XImmutableTable.Keys<K,​V>, XImmutableTable.Values<K,​V>, XIncreasingEnum<E>, XIncreasingList<E>, XIncreasingSequence<E>, XLadder<E>, XList<E>, XMap<K,​V>, XMap.Keys<K,​V>, XMap.Values<K,​V>, XProcessingBag<E>, XProcessingCollection<E>, XProcessingEnum<E>, XProcessingList<E>, XProcessingMap<K,​V>, XProcessingMap.Keys<K,​V>, XProcessingMap.Values<K,​V>, XProcessingSequence<E>, XProcessingSet<E>, XProcessingSortation<E>, XPutGetBag<E>, XPutGetCollection<E>, XPutGetEnum<E>, XPutGetList<E>, XPutGetMap<K,​V>, XPutGetSequence<E>, XPutGetSet<E>, XPutGetSortation<E>, XRank<E>, XReference<E>, XReferencing<E>, XReplacingBag<E>, XSequence<E>, XSet<E>, XSettingEnum<E>, XSettingList<E>, XSettingSequence<E>, XSortableEnum<E>, XSortableSequence<E>, XSortation<E>, XTable<K,​V>, XTable.Keys<K,​V>, XTable.Values<K,​V>
All Known Implementing Classes:
ArrayAccessor, ArrayCollector, ArrayView, BulkList, Constant, ConstHashEnum, ConstHashTable, ConstHashTable.Keys, ConstHashTable.Values, ConstLinearEnum, ConstList, Empty, EmptyTable, EnumProcessor, EnumView, EqBulkList, EqConstHashEnum, EqConstHashTable, EqConstHashTable.Keys, EqConstHashTable.Values, EqConstList, EqHashEnum, EqHashTable, EqHashTable.Keys, EqHashTable.Values, FixedList, HashEnum, HashTable, HashTable.Keys, HashTable.Values, LimitList, LinkingReferencing.Default, LinkReference.Default, ListAccessor, ListProcessor, ListView, LockedCollection, LockedGettingMap, LockedList, LockedMap, MappedList, MapView, MutexSet, OpenAdressingMiniSet, SetView, Single, Singleton, SingletonView, SubCollector, SubList, SubListAccessor, SubListProcessor, SubListView, SubProcessor, SubView, SynchCollection, SynchList, SynchSet, TableView, View
public interface XGettingCollection<E>
extends XIterable<E>, XJoinable<E>, ExtendedCollection<E>, Iterable<E>, CapacityCarrying, Copyable

  • Method Details

    • get

      E get()
      Gets one element from the collection. If the collection is not ordered XGettingSequence, then it is undefined which element is returned. If the collection is ordered, the element at index 0 is returned.
      Returns:
      the first / any element.

    • iterator

      Iterator<E> iterator()
      Specified by:
      iterator in interface Iterable<E>

    • toArray

      default Object[] toArray()
      Returns an array containing all of the elements in this collection.

      The returned array will be "safe" in that no references to it are maintained by this list. (In other words, this method must allocate a new array). The caller is thus free to modify the returned array.

      This method acts as bridge between MicroStream-based collections and Java-native-based APIs.

      Returns:
      an array containing all of the elements in this collection

    • toArray

      default E[] toArray​(Class<E> type)
      Returns a typed array containing all of the elements in this collection.

      The returned array will be "safe" in that no references to it are maintained by this list. (In other words, this method must allocate a new array). The caller is thus free to modify the returned array.

      This method acts as bridge between MicroStream-based collections and Java-native-based APIs.

      Returns:
      a typed array containing all of the elements in this collection

    • old

      OldCollection<E> old()

    • hasVolatileElements

      boolean hasVolatileElements()
      Description copied from interface: ExtendedCollection
      Tells if this collection contains volatile elements.
      An element is volatile, if it can become no longer reachable by the collection without being removed from the collection. Examples are WeakReference of SoftReference or implementations of collection entries that remove the element contained in an entry by some means outside the collection.
      Note that WeakReference instances that are added to a a simple (non-volatile) implementation of a collection do not make the collection volatile, as the elements themselves (the reference instances) are still strongly referenced.
      Specified by:
      hasVolatileElements in interface ExtendedCollection<E>
      Returns:
      true if the collection contains volatile elements.

    • size

      long size()
      Specified by:
      size in interface Sized

    • intSize

      default int intSize()

    • equality

      Equalator<? super E> equality()

    • equals

      boolean equals​(XGettingCollection<? extends E> samples, Equalator<? super E> equalator)
      Parameters:
      equalator - is used to check the equality of the collections
      samples - is the collection which is checked for equality
      Returns:
      true if the passed collection is of the same type as this collection and this.equalsContent(list, equalator) yields true

    • equalsContent

      boolean equalsContent​(XGettingCollection<? extends E> samples, Equalator<? super E> equalator)
      Returns true if all elements of this list and the passed list are sequentially equal as defined by the passed equalator.

      Note that for colletion types that don't have a defined order of elements, this method is hardly usable (as is equals(Object) for them as defined in Collection). The core problem of comparing collections that have no defined order is that they aren't really reliably comparable to any other collection.

      Parameters:
      equalator - the equalator to use to determine the equality of each element
      samples - is the collection which is checked for equality
      Returns:
      true if this list is equal to the passed list, false otherwise

    • immure

      XImmutableCollection<E> immure()
      Provides an instance of an immutable collection type with equal behavior and data as this instance.

      If this instance already is of an immutable collection type, it returns itself.

      Returns:
      an immutable copy of this collection instance.

    • view

      XGettingCollection<E> view()
      Creates a view of this collection and returns it. It is a read-only collection, which wraps around this collection and only allows read methods.

      A view is different from immutable collection (immure()) in the way, that changes in this collection are still affecting the view. The immutable collection on the other hand has no reference to this collection and changes therefore do not affect the immutable collection.

      Returns:
      new read-only collection to view this collection

    • copy

      XGettingCollection<E> copy()
      Creates a true copy of this collection which references the same elements as this collection does at the time the method is called. The elements themselves are NOT copied (no deep copying).
      The type of the returned set is the same as of this list if possible.
      Specified by:
      copy in interface Copyable
      Returns:
      a copy of this list

    • nullContained

      boolean nullContained()

    • containsId

      boolean containsId​(E element)
      Special version of contains() that guarantees to use identity comparison (" == ") when searching for the given element regardless of the collection's internal logic.
      This method has the same behavior as containsSearched(Predicate) with a Predicate implementation that checks for object identity. The only difference is a performance and usability advantage
      Parameters:
      element - the element to be searched in the collection by identity.
      Returns:
      whether this collection contains exactly the given element.

    • contains

      boolean contains​(E element)
      Checks if the given element is contained in the collection.
      In contrast to the containsId(Object) method, this method uses the internal Equalator defined by the collection itself.
      Parameters:
      element - to be searched in the collection
      Returns:
      Whether this collection contains the given element as specified by the Equalator.

    • containsSearched

      boolean containsSearched​(Predicate<? super E> predicate)

    • containsAll

      default boolean containsAll​(XGettingCollection<? extends E> elements)
      Parameters:
      elements - to be searched in the collection.
      Returns:
      Whether this collection contains all given elements as specified by the Equalator.

    • applies

      boolean applies​(Predicate<? super E> predicate)
      Tests each element of the collection on the given predicate.
      Parameters:
      predicate - that's tested on each element.
      Returns:
      If all elements test successfully, true is returned. Otherwise (if at least one test has failed), false is returned.

    • count

      long count​(E element)
      Count how many times this element matches another element in the collection using the Equalator.
      Parameters:
      element - to count
      Returns:
      Amount of matches

    • countBy

      long countBy​(Predicate<? super E> predicate)
      Count how many matches are found using the given predicate on each element of the collection.
      Parameters:
      predicate - defines which elements are counted and which are not
      Returns:
      Amount of matches

    • search

      E search​(Predicate<? super E> predicate)
      Returns the first contained element matching the passed predicate.
      Parameters:
      predicate - defines which element is searched
      Returns:
      Matching element

    • seek

      E seek​(E sample)
      Returns the first contained element matching the passed sample as defined by the collection's equality logic or null, if no fitting element is contained. (For collections using referential equality, this method is basically just a variation of contains(Object) with a different return type. For collections with data-dependant equality, the returned element might be the same as the passed one or a data-wise equal one, depending on the content of the collection)
      Parameters:
      sample - to seek in the collection
      Returns:
      the first contained element matching the passed sample

    • max

      E max​(Comparator<? super E> comparator)

    • min

      E min​(Comparator<? super E> comparator)

    • distinct

      <T extends Consumer<? super E>> T distinct​(T target)
      Calls Consumer.accept(Object) on the target Consumer for all the unique/distinct elements of this collection. This means the elements are not equal to each other.
      Uniqueness is defined by the collections internal Equalator.

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,2,3);
      BulkList<Integer> distinctCollection = collection1.distinct(BulkList.New());
      Results in distinctCollection containing 1, 2 and 3.

      Parameters:
      target - on which the Consumer.accept(Object) is called for every distinct element of this collection.
      Returns:
      Given target

    • distinct

      <T extends Consumer<? super E>> T distinct​(T target, Equalator<? super E> equalator)
      Calls Consumer.accept(Object) on the target Consumer for all the unique/distinct elements of this collection. This means the elements are not equal to each other.
      Uniqueness is defined by the given Equalator.

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,2,3);
      BulkList<Integer> distinctCollection = collection1.distinct(BulkList.New(), Equalator.identity());
      Results in distinctCollection containing 1, 2 and 3.

      Parameters:
      target - on which the Consumer.accept(Object) is called for every distinct element of this collection.
      equalator - defines what distinct means (which elements are equal to one another)
      Returns:
      Given target

    • copyTo

      <T extends Consumer<? super E>> T copyTo​(T target)
      Calls Consumer.accept(Object) on the target Consumer for all the elements of this collection.

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,3);
      BulkList<Integer> copiedCollection = collection1.copyTo(BulkList.New());
      Results in copiedCollection containing 1, 2 and 3.

      Parameters:
      target - on which the Consumer.accept(Object) is called for all elements of this collection.
      Returns:
      Given target

    • filterTo

      <T extends Consumer<? super E>> T filterTo​(T target, Predicate<? super E> predicate)
      Calls Consumer.accept(Object) on the target Consumer for all the elements of this collection which test true on the given predicate.

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,3);
      BulkList<Integer> filteredCollection = collection1.filterTo(BulkList.New(), e-> e % 2 == 0);
      Results in filteredCollection containing 2.

      Parameters:
      target - on which the Consumer.accept(Object) is called for elements that test true.
      predicate - on which to test all elements.
      Returns:
      Given target

    • union

      <T extends Consumer<? super E>> T union​(XGettingCollection<? extends E> other, Equalator<? super E> equalator, T target)
      Calls Consumer.accept(Object) on the target Consumer for all the elements of this collection. And calls it for all elements of the other collection, that are not already in this collection (defined by the given Equalator)
      Therefore it effectively creates a mathematical union between the two collections.

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,3);
      BulkList<Integer> collection2 = BulkList.New(2,3,4);
      BulkList<Integer> union = collection1.union(collection2, Equalator.identity(), BulkList.New());
      Results in union containing 1, 2, 3 and 4.

      Parameters:
      other - collection to build a union with.
      equalator - which is used for the equal-tests.
      target - on which the Consumer.accept(Object) is called for all unified elements.
      Returns:
      Given target

    • intersect

      <T extends Consumer<? super E>> T intersect​(XGettingCollection<? extends E> other, Equalator<? super E> equalator, T target)
      Tests equality between each element of the two lists and calls Consumer.accept(Object) on the target Consumer for the equal elements.
      Therefore it effectively creates a mathematical intersection between the two collections.

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,3);
      BulkList<Integer> collection2 = BulkList.New(2,3,4);
      BulkList<Integer> intersection = collection1.intersect(collection2, Equalator.identity(), BulkList.New());
      Results in intersection containing 2 and 3.

      Parameters:
      other - collection to intersect with.
      equalator - which is used for the equal-tests.
      target - on which the Consumer.accept(Object) is called for equal elements.
      Returns:
      Given target

    • except

      <T extends Consumer<? super E>> T except​(XGettingCollection<? extends E> other, Equalator<? super E> equalator, T target)
      Calls Consumer.accept(Object) on the target Consumer for each element of this collection that is not contained in the other collection (through the given equalator).

      Since all MicroStream Collections implement the Consumer interface, new collections can be used as target.

      Example:
      BulkList<Integer> collection1 = BulkList.New(1,2,3);
      BulkList<Integer> collection2 = BulkList.New(2,3,4);
      BulkList<Integer> exceptCollection = collection1.except(collection2, Equalator.identity(), BulkList.New());
      Results in exceptCollection containing 1.

      Type Parameters:
      T - type of the target
      Parameters:
      other - collection whose elements are excluded from the target.
      equalator - which is used for the equal-tests.
      target - on which the Consumer.accept(Object) is called for elements not contained in the other collection.
      Returns:
      Given target

    • join

      default <A> A join​(BiConsumer<? super E,​? super A> joiner, A aggregate)
      Description copied from interface: XJoinable
      Iterates over all elements of the collections and calls the joiner with each element and the aggregate.
      Specified by:
      join in interface XJoinable<E>
      Type Parameters:
      A - type of aggregate
      Parameters:
      joiner - is the actual function to do the joining
      aggregate - where to join into

    • equals

      @Deprecated boolean equals​(Object o)
      Deprecated.
      Performs an equality comparison according to the specification in Collection.

      Note that it is this interface's author opinion that the whole concept of equals() in standard Java, especially in the collection implementations, is flawed.
      The reason is because all different kinds of comparison types that actually depend on the situation have to be mixed up in a harcoded fashion in one method, from identity comparison over data indentity comparison to content comparison.
      In order to get the right behavior in every situation, one has to distinct between different types of equality

      This means several things:
      1.) You can't just say for example an ArrayList is the "same" as a LinkedList just because they contain the same content.
      There are different implementations for a good reason, so you have to distinct them when comparing. There are simple code examples which create massive misbehavior that will catastrophically ruin the runtime behavior of a programm due to this error in Java / JDK / Sun / whatever.
      2.) You can't always determine equality of two collections by determining equality of each element as Collection defines it.

      As a conclusion: don't use this method!
      Be clear what type of comparison you really need, then use one of the following methods and proper comparators:
      equals(XGettingCollection, Equalator)
      equalsContent(XGettingCollection, Equalator)

      Overrides:
      equals in class Object
      Parameters:
      o -

    • hashCode

      @Deprecated int hashCode()
      Deprecated.
      Overrides:
      hashCode in class Object