Class ObjectArrayDeque<KType>

    • Field Summary

      Fields 
      Modifier and Type Field Description
      java.lang.Object[] buffer
      Internal array for storing elements of the deque.
      int head
      The index of the element at the head of the deque or an arbitrary number equal to tail if the deque is empty.
      protected ArraySizingStrategy resizer
      Buffer resizing strategy.
      int tail
      The index at which the next element would be added to the tail of the deque.
    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int addFirst​(ObjectContainer<? extends KType> container)
      Inserts all elements from the given container to the front of this deque.
      int addFirst​(java.lang.Iterable<? extends ObjectCursor<? extends KType>> iterable)
      Inserts all elements from the given iterable to the front of this deque.
      void addFirst​(KType e1)
      Inserts the specified element at the front of this deque.
      void addFirst​(KType... elements)
      Vararg-signature method for adding elements at the front of this deque.
      int addLast​(ObjectContainer<? extends KType> container)
      Inserts all elements from the given container to the end of this deque.
      int addLast​(java.lang.Iterable<? extends ObjectCursor<? extends KType>> iterable)
      Inserts all elements from the given iterable to the end of this deque.
      void addLast​(KType e1)
      Inserts the specified element at the end of this deque.
      void addLast​(KType... elements)
      Vararg-signature method for adding elements at the end of this deque.
      int bufferIndexOf​(KType e1)
      Return the index of the first (counting from head) element equal to e1.
      void clear()
      Removes all elements from this collection.
      ObjectArrayDeque<KType> clone()
      Clone this object.
      boolean contains​(KType e)
      Lookup a given element in the container.
      private void descendingForEach​(ObjectPredicate<? super KType> predicate, int fromIndex, int toIndex)
      Applies predicate to a slice of the deque, toIndex, exclusive, down to fromIndex, inclusive or until the predicate returns false.
      private void descendingForEach​(ObjectProcedure<? super KType> procedure, int fromIndex, int toIndex)
      Applies procedure to a slice of the deque, toIndex, exclusive, down to fromIndex, inclusive.
      <T extends ObjectProcedure<? super KType>>
      T
      descendingForEach​(T procedure)
      Applies procedure to all elements of this deque, tail to head.
      java.util.Iterator<ObjectCursor<KType>> descendingIterator()
      Returns a cursor over the values of this deque (in tail to head order).
      protected void ensureBufferSpace​(int expectedAdditions)
      Ensures the internal buffer has enough free slots to store expectedAdditions.
      void ensureCapacity​(int expectedElements)
      Ensure this container can hold at least the given number of elements without resizing its buffers.
      protected boolean equalElements​(ObjectArrayDeque<?> other)
      Compare order-aligned elements against another ObjectDeque.
      boolean equals​(java.lang.Object obj)
      Returns true only if the other object is an instance of the same class and with the same elements.
      private void forEach​(ObjectProcedure<? super KType> procedure, int fromIndex, int toIndex)
      Applies procedure to a slice of the deque, fromIndex, inclusive, to toIndex, exclusive.
      <T extends ObjectProcedure<? super KType>>
      T
      forEach​(T procedure)
      Applies a procedure to all container elements.
      static <KType> ObjectArrayDeque<KType> from​(KType... elements)
      Create a new deque by pushing a variable number of arguments to the end of it.
      KType getFirst()
      Retrieves the first element of this deque but does not remove it.
      KType getLast()
      Retrieves the last element of this deque but does not remove it.
      int hashCode()
      boolean isEmpty()
      Shortcut for size() == 0.
      java.util.Iterator<ObjectCursor<KType>> iterator()
      Returns a cursor over the values of this deque (in head to tail order).
      int lastBufferIndexOf​(KType e1)
      Return the index of the last (counting from tail) element equal to e1.
      protected static int oneLeft​(int index, int modulus)
      Move one index to the left, wrapping around buffer.
      protected static int oneRight​(int index, int modulus)
      Move one index to the right, wrapping around buffer.
      void release()
      Release internal buffers of this deque and reallocate with the default buffer.
      int removeAll​(ObjectPredicate<? super KType> predicate)
      Removes all elements in this collection for which the given predicate returns true.
      int removeAll​(KType e1)
      Removes all occurrences of e from this collection.
      void removeAtBufferIndex​(int index)
      Removes the element at index in the internal {#link buffer array, returning its value.
      KType removeFirst()
      Retrieves and removes the first element of this deque.
      int removeFirst​(KType e1)
      Removes the first element that equals e.
      KType removeLast()
      Retrieves and removes the last element of this deque.
      int removeLast​(KType e1)
      Removes the last element that equals e.
      int size()
      Return the current number of elements in this container.
      java.lang.Object[] toArray()
      Default implementation of copying to an array.
      KType[] toArray​(KType[] target)
      Copies elements of this deque to an array.
      • Methods inherited from class java.lang.Object

        finalize, getClass, notify, notifyAll, wait, wait, wait
      • Methods inherited from interface java.lang.Iterable

        forEach, spliterator
    • Field Detail

      • buffer

        public java.lang.Object[] buffer
        Internal array for storing elements of the deque.
      • head

        public int head
        The index of the element at the head of the deque or an arbitrary number equal to tail if the deque is empty.
      • tail

        public int tail
        The index at which the next element would be added to the tail of the deque.
    • Constructor Detail

      • ObjectArrayDeque

        public ObjectArrayDeque()
        New instance with sane defaults.
      • ObjectArrayDeque

        public ObjectArrayDeque​(int expectedElements)
        New instance with sane defaults.
        Parameters:
        expectedElements - The expected number of elements guaranteed not to cause buffer expansion (inclusive).
      • ObjectArrayDeque

        public ObjectArrayDeque​(int expectedElements,
                                ArraySizingStrategy resizer)
        New instance with sane defaults.
        Parameters:
        expectedElements - The expected number of elements guaranteed not to cause buffer expansion (inclusive).
        resizer - Underlying buffer sizing strategy.
      • ObjectArrayDeque

        public ObjectArrayDeque​(ObjectContainer<? extends KType> container)
        Creates a new deque from elements of another container, appending elements at the end of the deque in the iteration order.
    • Method Detail

      • addFirst

        public void addFirst​(KType e1)
        Inserts the specified element at the front of this deque.
        Specified by:
        addFirst in interface ObjectDeque<KType>
      • addFirst

        @SafeVarargs
        public final void addFirst​(KType... elements)
        Vararg-signature method for adding elements at the front of this deque.

        This method is handy, but costly if used in tight loops (anonymous array passing)

        Parameters:
        elements - The elements to add.
      • addFirst

        public int addFirst​(ObjectContainer<? extends KType> container)
        Inserts all elements from the given container to the front of this deque.
        Parameters:
        container - The container to iterate over.
        Returns:
        Returns the number of elements actually added as a result of this call.
      • addFirst

        public int addFirst​(java.lang.Iterable<? extends ObjectCursor<? extends KType>> iterable)
        Inserts all elements from the given iterable to the front of this deque.
        Parameters:
        iterable - The iterable to iterate over.
        Returns:
        Returns the number of elements actually added as a result of this call.
      • addLast

        public void addLast​(KType e1)
        Inserts the specified element at the end of this deque.
        Specified by:
        addLast in interface ObjectDeque<KType>
      • addLast

        @SafeVarargs
        public final void addLast​(KType... elements)
        Vararg-signature method for adding elements at the end of this deque.

        This method is handy, but costly if used in tight loops (anonymous array passing)

        Parameters:
        elements - The elements to iterate over.
      • addLast

        public int addLast​(ObjectContainer<? extends KType> container)
        Inserts all elements from the given container to the end of this deque.
        Parameters:
        container - The container to iterate over.
        Returns:
        Returns the number of elements actually added as a result of this call.
      • addLast

        public int addLast​(java.lang.Iterable<? extends ObjectCursor<? extends KType>> iterable)
        Inserts all elements from the given iterable to the end of this deque.
        Parameters:
        iterable - The iterable to iterate over.
        Returns:
        Returns the number of elements actually added as a result of this call.
      • removeFirst

        public KType removeFirst()
        Retrieves and removes the first element of this deque.
        Specified by:
        removeFirst in interface ObjectDeque<KType>
        Returns:
        the head (first) element of this deque.
      • removeLast

        public KType removeLast()
        Retrieves and removes the last element of this deque.
        Specified by:
        removeLast in interface ObjectDeque<KType>
        Returns:
        the tail of this deque.
      • getFirst

        public KType getFirst()
        Retrieves the first element of this deque but does not remove it.
        Specified by:
        getFirst in interface ObjectDeque<KType>
        Returns:
        the head of this deque.
      • getLast

        public KType getLast()
        Retrieves the last element of this deque but does not remove it.
        Specified by:
        getLast in interface ObjectDeque<KType>
        Returns:
        the head of this deque.
      • removeFirst

        public int removeFirst​(KType e1)
        Removes the first element that equals e.
        Specified by:
        removeFirst in interface ObjectDeque<KType>
        Returns:
        The deleted element's index or -1 if the element was not found.
      • bufferIndexOf

        public int bufferIndexOf​(KType e1)
        Return the index of the first (counting from head) element equal to e1. The index points to the buffer array.
        Parameters:
        e1 - The element to look for.
        Returns:
        Returns the index of the first element equal to e1 or -1 if not found.
      • removeLast

        public int removeLast​(KType e1)
        Removes the last element that equals e.
        Specified by:
        removeLast in interface ObjectDeque<KType>
        Returns:
        The deleted element's index or -1 if the element was not found.
      • lastBufferIndexOf

        public int lastBufferIndexOf​(KType e1)
        Return the index of the last (counting from tail) element equal to e1. The index points to the buffer array.
        Parameters:
        e1 - The element to look for.
        Returns:
        Returns the index of the first element equal to e1 or -1 if not found.
      • removeAll

        public int removeAll​(KType e1)
        Removes all occurrences of e from this collection.
        Specified by:
        removeAll in interface ObjectCollection<KType>
        Parameters:
        e1 - Element to be removed from this collection, if present.
        Returns:
        The number of removed elements as a result of this call.
      • removeAtBufferIndex

        public void removeAtBufferIndex​(int index)
        Removes the element at index in the internal {#link buffer array, returning its value.
        Parameters:
        index - Index of the element to remove. The index must be located between head and tail in modulo buffer arithmetic.
      • size

        public int size()
        Return the current number of elements in this container. The time for calculating the container's size may take O(n) time, although implementing classes should try to maintain the current size and return in constant time.
        Specified by:
        size in interface ObjectContainer<KType>
      • clear

        public void clear()
        Removes all elements from this collection.

        The internal array buffers are not released as a result of this call.

        Specified by:
        clear in interface ObjectCollection<KType>
        See Also:
        release()
      • ensureCapacity

        public void ensureCapacity​(int expectedElements)
        Ensure this container can hold at least the given number of elements without resizing its buffers.
        Specified by:
        ensureCapacity in interface Preallocable
        Parameters:
        expectedElements - The total number of elements, inclusive.
      • ensureBufferSpace

        protected void ensureBufferSpace​(int expectedAdditions)
        Ensures the internal buffer has enough free slots to store expectedAdditions. Increases internal buffer size if needed.
      • toArray

        public KType[] toArray​(KType[] target)
        Copies elements of this deque to an array. The content of the target array is filled from index 0 (head of the queue) to index size() - 1 (tail of the queue).
        Parameters:
        target - The target array must be large enough to hold all elements.
        Returns:
        Returns the target argument for chaining.
      • clone

        public ObjectArrayDeque<KType> clone()
        Clone this object. The returned clone will reuse the same hash function and array resizing strategy.
        Overrides:
        clone in class java.lang.Object
      • oneLeft

        protected static int oneLeft​(int index,
                                     int modulus)
        Move one index to the left, wrapping around buffer.
      • oneRight

        protected static int oneRight​(int index,
                                      int modulus)
        Move one index to the right, wrapping around buffer.
      • iterator

        public java.util.Iterator<ObjectCursor<KType>> iterator()
        Returns a cursor over the values of this deque (in head to tail order). The iterator is implemented as a cursor and it returns the same cursor instance on every call to Iterator.next() (to avoid boxing of primitive types). To read the current value (or index in the deque's buffer) use the cursor's public fields. An example is shown below.
         for (IntValueCursor c : intDeque) {
           System.out.println("buffer index=" + c.index + " value=" + c.value);
         }
         
        Specified by:
        iterator in interface java.lang.Iterable<KType>
        Specified by:
        iterator in interface ObjectContainer<KType>
      • descendingIterator

        public java.util.Iterator<ObjectCursor<KType>> descendingIterator()
        Returns a cursor over the values of this deque (in tail to head order). The iterator is implemented as a cursor and it returns the same cursor instance on every call to Iterator.next() (to avoid boxing of primitive types). To read the current value (or index in the deque's buffer) use the cursor's public fields. An example is shown below.
         for (Iterator<IntCursor> i = intDeque.descendingIterator(); i.hasNext();) {
           final IntCursor c = i.next();
           System.out.println("buffer index=" + c.index + " value=" + c.value);
         }
         
        Specified by:
        descendingIterator in interface ObjectDeque<KType>
        Returns:
        An iterator over elements in this deque in tail-to-head order.
      • forEach

        public <T extends ObjectProcedure<? super KType>> T forEach​(T procedure)
        Applies a procedure to all container elements. Returns the argument (any subclass of ObjectProcedure. This lets the caller to call methods of the argument by chaining the call (even if the argument is an anonymous type) to retrieve computed values, for example (IntContainer):
         int count = container.forEach(new IntProcedure() {
           int count; // this is a field declaration in an anonymous class.
         
           public void apply(int value) {
             count++;
           }
         }).count;
         
        Specified by:
        forEach in interface ObjectContainer<KType>
      • forEach

        private void forEach​(ObjectProcedure<? super KType> procedure,
                             int fromIndex,
                             int toIndex)
        Applies procedure to a slice of the deque, fromIndex, inclusive, to toIndex, exclusive.
      • forEach

        public <T extends ObjectPredicate<? super KType>> T forEach​(T predicate)
        Applies a predicate to container elements as long, as the predicate returns true. The iteration is interrupted otherwise.
        Specified by:
        forEach in interface ObjectContainer<KType>
      • descendingForEach

        private void descendingForEach​(ObjectProcedure<? super KType> procedure,
                                       int fromIndex,
                                       int toIndex)
        Applies procedure to a slice of the deque, toIndex, exclusive, down to fromIndex, inclusive.
      • descendingForEach

        public <T extends ObjectPredicate<? super KType>> T descendingForEach​(T predicate)
        Applies a predicate to container elements as long, as the predicate returns true. The iteration is interrupted otherwise.
        Specified by:
        descendingForEach in interface ObjectDeque<KType>
      • descendingForEach

        private void descendingForEach​(ObjectPredicate<? super KType> predicate,
                                       int fromIndex,
                                       int toIndex)
        Applies predicate to a slice of the deque, toIndex, exclusive, down to fromIndex, inclusive or until the predicate returns false.
      • removeAll

        public int removeAll​(ObjectPredicate<? super KType> predicate)
        Removes all elements in this collection for which the given predicate returns true.
        Specified by:
        removeAll in interface ObjectCollection<KType>
        Returns:
        Returns the number of removed elements.
      • contains

        public boolean contains​(KType e)
        Lookup a given element in the container. This operation has no speed guarantees (may be linear with respect to the size of this container).
        Specified by:
        contains in interface ObjectContainer<KType>
        Returns:
        Returns true if this container has an element equal to e.
      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object
      • equals

        public boolean equals​(java.lang.Object obj)
        Returns true only if the other object is an instance of the same class and with the same elements. Equality comparison is performed with this object's AbstractObjectCollection.equals(Object, Object) method.
        Overrides:
        equals in class java.lang.Object
      • from

        @SafeVarargs
        public static <KType> ObjectArrayDeque<KType> from​(KType... elements)
        Create a new deque by pushing a variable number of arguments to the end of it.