Interface Bag<E>

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      boolean add​(E object)
      (Violation) Adds one copy of the specified object to the Bag.
      boolean add​(E object, int nCopies)
      Adds nCopies copies of the specified object to the Bag.
      boolean containsAll​(java.util.Collection<?> coll)
      (Violation) Returns true if the bag contains all elements in the given collection, respecting cardinality.
      int getCount​(java.lang.Object object)
      Returns the number of occurrences (cardinality) of the given object currently in the bag.
      java.util.Iterator<E> iterator()
      Returns an Iterator over the entire set of members, including copies due to cardinality.
      boolean remove​(java.lang.Object object)
      (Violation) Removes all occurrences of the given object from the bag.
      boolean remove​(java.lang.Object object, int nCopies)
      Removes nCopies copies of the specified object from the Bag.
      boolean removeAll​(java.util.Collection<?> coll)
      (Violation) Remove all elements represented in the given collection, respecting cardinality.
      boolean retainAll​(java.util.Collection<?> coll)
      (Violation) Remove any members of the bag that are not in the given collection, respecting cardinality.
      int size()
      Returns the total number of items in the bag across all types.
      java.util.Set<E> uniqueSet()
      Returns a Set of unique elements in the Bag.
      • Methods inherited from interface java.util.Collection

        addAll, clear, contains, equals, hashCode, isEmpty, parallelStream, removeIf, spliterator, stream, toArray, toArray, toArray
      • Methods inherited from interface java.lang.Iterable

        forEach
    • Method Detail

      • getCount

        int getCount​(java.lang.Object object)
        Returns the number of occurrences (cardinality) of the given object currently in the bag. If the object does not exist in the bag, return 0.
        Parameters:
        object - the object to search for
        Returns:
        the number of occurrences of the object, zero if not found
      • add

        boolean add​(E object)
        (Violation) Adds one copy of the specified object to the Bag.

        If the object is already in the uniqueSet() then increment its count as reported by getCount(Object). Otherwise add it to the uniqueSet() and report its count as 1.

        Since this method always increases the size of the bag, according to the Collection.add(Object) contract, it should always return true. Since it sometimes returns false, this method violates the contract.

        Specified by:
        add in interface java.util.Collection<E>
        Parameters:
        object - the object to add
        Returns:
        true if the object was not already in the uniqueSet
      • add

        boolean add​(E object,
                    int nCopies)
        Adds nCopies copies of the specified object to the Bag.

        If the object is already in the uniqueSet() then increment its count as reported by getCount(Object). Otherwise add it to the uniqueSet() and report its count as nCopies.

        Parameters:
        object - the object to add
        nCopies - the number of copies to add
        Returns:
        true if the object was not already in the uniqueSet
      • remove

        boolean remove​(java.lang.Object object)
        (Violation) Removes all occurrences of the given object from the bag.

        This will also remove the object from the uniqueSet().

        According to the Collection.remove(Object) method, this method should only remove the first occurrence of the given object, not all occurrences.

        Specified by:
        remove in interface java.util.Collection<E>
        Parameters:
        object - the object to remove
        Returns:
        true if this call changed the collection
      • remove

        boolean remove​(java.lang.Object object,
                       int nCopies)
        Removes nCopies copies of the specified object from the Bag.

        If the number of copies to remove is greater than the actual number of copies in the Bag, no error is thrown.

        Parameters:
        object - the object to remove
        nCopies - the number of copies to remove
        Returns:
        true if this call changed the collection
      • uniqueSet

        java.util.Set<E> uniqueSet()
        Returns a Set of unique elements in the Bag.

        Uniqueness constraints are the same as those in Set.

        Returns:
        the Set of unique Bag elements
      • size

        int size()
        Returns the total number of items in the bag across all types.
        Specified by:
        size in interface java.util.Collection<E>
        Returns:
        the total size of the Bag
      • containsAll

        boolean containsAll​(java.util.Collection<?> coll)
        (Violation) Returns true if the bag contains all elements in the given collection, respecting cardinality. That is, if the given collection coll contains n copies of a given object, calling getCount(Object) on that object must be >= n for all n in coll.

        The Collection.containsAll(Collection) method specifies that cardinality should not be respected; this method should return true if the bag contains at least one of every object contained in the given collection.

        Specified by:
        containsAll in interface java.util.Collection<E>
        Parameters:
        coll - the collection to check against
        Returns:
        true if the Bag contains all the collection
      • removeAll

        boolean removeAll​(java.util.Collection<?> coll)
        (Violation) Remove all elements represented in the given collection, respecting cardinality. That is, if the given collection coll contains n copies of a given object, the bag will have n fewer copies, assuming the bag had at least n copies to begin with.

        The Collection.removeAll(Collection) method specifies that cardinality should not be respected; this method should remove all occurrences of every object contained in the given collection.

        Specified by:
        removeAll in interface java.util.Collection<E>
        Parameters:
        coll - the collection to remove
        Returns:
        true if this call changed the collection
      • retainAll

        boolean retainAll​(java.util.Collection<?> coll)
        (Violation) Remove any members of the bag that are not in the given collection, respecting cardinality. That is, if the given collection coll contains n copies of a given object and the bag has m > n copies, then delete m - n copies from the bag. In addition, if e is an object in the bag but !coll.contains(e), then remove e and any of its copies.

        The Collection.retainAll(Collection) method specifies that cardinality should not be respected; this method should keep all occurrences of every object contained in the given collection.

        Specified by:
        retainAll in interface java.util.Collection<E>
        Parameters:
        coll - the collection to retain
        Returns:
        true if this call changed the collection
      • iterator

        java.util.Iterator<E> iterator()
        Returns an Iterator over the entire set of members, including copies due to cardinality. This iterator is fail-fast and will not tolerate concurrent modifications.
        Specified by:
        iterator in interface java.util.Collection<E>
        Specified by:
        iterator in interface java.lang.Iterable<E>
        Returns:
        iterator over all elements in the Bag