Package com.vladsch.flexmark.experimental.util.collection.iteration

Class IPositionBase<T,​P extends IPosition<T,​P>>

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean add​(int offset, T element)
      Add element at position given by relative offset to current position.
      boolean add​(T element)  
      boolean addAll​(int offset, java.util.Collection<T> elements)  
      boolean addAll​(java.util.Collection<T> elements)  
      boolean append​(T element)  
      java.lang.Iterable<P> backwards()
      Iterable for this position and all previous positions in decreasing index order
      void deleted​(int index, int count)
      delete Notification
      void detachListener()
      Tells listener to remove itself from parent NOTE: used as optimization in iterators which are guaranteed not to have any other references to their position element.
      boolean equals​(java.lang.Object o)
      Listeners should not change hashCode() or equals() from their default implementation where the instance is only equal to itself.
      java.lang.Iterable<P> forwards()
      iterable for this position and all following positions in increasing index order
      T get()  
      T get​(int offset)
      Insert element at index
      PositionAnchor getAnchor()
      Position Anchor for this position
      int getIndex()
      FIX: allow getIndex(offset) to return -1
      int getIndex​(int offset)  
      T getOrNull()  
      T getOrNull​(int offset)
      Insert element at index
      <S extends T>
      S      		 getOrNull​(int offset, java.lang.Class<S> elementClass)
      Get the requested class or null if element at position cannot be cast to this class
      <S extends T>
      S      		 getOrNull​(java.lang.Class<S> elementClass)
      Get the requested class or null if element at position cannot be cast to this class
      P getPosition​(int offset)  
      int hashCode()
      Listeners should not change hashCode() or equals() from their default implementation where the instance is only equal to itself.
      boolean hasNext()  
      boolean hasPrevious()  
      P indexOf​(int offset, java.util.function.Predicate<P> predicate)  
      P indexOf​(int offset, T o)  
      P indexOf​(java.util.function.Predicate<P> predicate)  
      P indexOf​(T o)  
      void inserted​(int index, int count)
      Anchor position effect on insert/delete, IPositionHolder.isValid(), IPosition.isValidIndex() and IPositionHolder.isValidElement()
      void invalidate()
      Mark position as not valid may be useful for something.
      boolean isDetached()  
      boolean isEmpty()  
      boolean isValid()  
      boolean isValidElement()  
      boolean isValidIndex()  
      P lastIndexOf​(int offset, java.util.function.Predicate<P> predicate)  
      P lastIndexOf​(int offset, T o)  
      P lastIndexOf​(java.util.function.Predicate<P> predicate)  
      P lastIndexOf​(T o)  
      int maxOffset()  
      int minOffset()  
      P next()
      Get next index position relative to current, returns next position if it exists even when this position is not valid
      java.lang.Iterable<P> nextForwards()
      Iterator for all following positions, excluding this position in increasing index order
      int nextIndex()
      Returns the index of the element that would be returned by a subsequent call to IPositionHolder.next().
      P nextOrNull()
      Return valid next position, with the same position anchor as this position, or null if does not exist.
      P previous()
      Get previous index position relative to current, returns previous index if it exists even when this position is not valid
      java.lang.Iterable<P> previousBackwards()
      iterable for all previous positions, excluding this position in decreasing index order
      int previousIndex()
      Returns the index of the element that would be returned by a subsequent call to IPositionHolder.previous().
      P previousOrNull()
      Return valid previous position, with the same position anchor as this position, or null if does not exist.
      T remove()  
      T remove​(int offset)  
      void remove​(int startOffset, int endOffset)  
      T set​(int offset, T element)
      Set element at given index
      void set​(T element)  
      void setDetached()
      Tells the listener it has been detached by its parent list NOTE: used as optimization in position list frames to detach any positions which have not been unframed()
      int size()  
      java.lang.String toString()  
      void unframed()
      Mark this position as used outside the iteration frame in which it was created.
      P withAnchor​(PositionAnchor anchor)
      Get a new position with requested anchor from this position

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    • Method Detail

      • inserted

        public void inserted​(int index,
                     int count)
        Anchor position effect on insert/delete, IPositionHolder.isValid(), IPosition.isValidIndex() and IPositionHolder.isValidElement()

        PositionAnchor.CURRENT - tracks a specific element at index when the position is instantiated. Adding elements before the position will shift the range down in the list. Removing elements before the position will shift the range up in the list. Removing elements which include the position's index will set its span to 0. The position is always available for adding/removing next/previous elements. The current element is only available when span is 1.

        PositionAnchor.PREVIOUS - tracks the previous element to the position from which it was instantiated. The span will be 0 if no previous element existed when it was instantiated (ie. at position 0) or was removed later. The index reflects the position in the list previous to the position at time it was instantiated. Adding elements before this position does not affect the position or span. Adding elements before the previous position shifts the range down in the list. Removing elements before the position shifts the range up in the list. If the element previous to this position is removed, then the span is set to 0.

        This anchor position type is used for iterating positions in reverse since it ignores insertions into the list immediately before the current position.

        PositionAnchor.NEXT - tracks the next element to the position from which it was instantiated. The span will be 0 if no next element existed when it was instantiated (ie. at end of the list) or was removed later. Adding elements before this position will shift the range down in the list. Removing elements before this position will shift the range up in the list. Removing element which include the next element of this position will set its span to 0.

        This anchor position type is used for iterating positions since it ignores insertions into the list immediately after the current position.

        Specified by:
        inserted in interface IPositionListener
        Parameters:
        index - position of insert
        count - number of elements inserted

      • deleted

        public void deleted​(int index,
                    int count)
        Description copied from interface: IPositionListener
        delete Notification
        Specified by:
        deleted in interface IPositionListener
        Parameters:
        index - at which delete was performed, list contents and size at this point are already updated
        count - of elements deleted

      • isValid

        public boolean isValid()
        Specified by:
        isValid in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        true if this position was not invalidated by deleting the element at index

      • invalidate

        public void invalidate()
        Description copied from interface: IPosition
        Mark position as not valid may be useful for something. Invalidates current element with all side-effects of this state
        Specified by:
        invalidate in interface IPosition<T,​P extends IPosition<T,​P>>

      • detachListener

        public void detachListener()
        Description copied from interface: IPositionHolder
        Tells listener to remove itself from parent NOTE: used as optimization in iterators which are guaranteed not to have any other references to their position element.

        Do not otherwise use this because this position will stop having the list modification updates and will throw IllegalStateException on any attempt to use any methods of this position other than IPositionHolder.isDetached()

        Specified by:
        detachListener in interface IPositionHolder<T,​P extends IPosition<T,​P>>

      • setDetached

        public void setDetached()
        Description copied from interface: IPositionHolder
        Tells the listener it has been detached by its parent list NOTE: used as optimization in position list frames to detach any positions which have not been unframed()
        Specified by:
        setDetached in interface IPositionHolder<T,​P extends IPosition<T,​P>>

      • unframed

        public void unframed()
        Description copied from interface: IPositionHolder
        Mark this position as used outside the iteration frame in which it was created. It allows positions to not be detached when the frame is closed.
        Specified by:
        unframed in interface IPositionHolder<T,​P extends IPosition<T,​P>>

      • withAnchor

        @NotNull
public P withAnchor​(@NotNull
                    PositionAnchor anchor)
        Description copied from interface: IPositionHolder
        Get a new position with requested anchor from this position

        CURRENT - position represents the element and if deleted will be invalidated, if inserting at or before index then will advance to keep position of element

        NEXT - position represents the next element

        PREVIOUS - position represents the previous element

        Specified by:
        withAnchor in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Parameters:
        anchor - desired anchor position
        Returns:
        new position with requested or this if there is no anchor change

      • getIndex

        public int getIndex()
        Description copied from interface: IPositionHolder
        FIX: allow getIndex(offset) to return -1
        Specified by:
        getIndex in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        absolute index in list, even when this position does not refer to a valid element it will always be [-1, list.size()] if it is referring to a valid element then the returned range will be [0, list.size()-1]

      • getIndex

        public int getIndex​(int offset)
        Specified by:
        getIndex in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        offset - offset to current position

        FIX: allow getIndex(offset) to return -1

        Returns:
        absolute index in list, even if this position is not valid, it will always be [-1, list.size()]

      • getPosition

        public P getPosition​(int offset)
        Specified by:
        getPosition in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        offset - index relative to current position, <0 previous elements, 0 means current, >0 following elements
        Returns:
        Position representing the index relative to current position, throws IllegalStateException if current position is not valid and given index == 0 throws IndexOutOfBoundsException if requested index results in absolute index <0 or >size() of the list

        NOTE: to avoid exceptions test if position has a valid index with isValidIndex()

      • previous

        public P previous()
        Description copied from interface: IPositionHolder
        Get previous index position relative to current, returns previous index if it exists even when this position is not valid
        Specified by:
        previous in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        previous valid position relative to this position, with the same position anchor as this position throws IndexOutOfBoundsException if there is no elements before current position

      • previousOrNull

        public P previousOrNull()
        Description copied from interface: IPositionHolder
        Return valid previous position, with the same position anchor as this position, or null if does not exist. Does not throw exceptions
        Specified by:
        previousOrNull in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        previous position or null

      • next

        public P next()
        Description copied from interface: IPositionHolder
        Get next index position relative to current, returns next position if it exists even when this position is not valid
        Specified by:
        next in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        previous valid position relative to this position, with the same position anchor as this position throws IndexOutOfBoundsException if there is no elements before current position

      • nextIndex

        public int nextIndex()
        Description copied from interface: IPositionHolder
        Returns the index of the element that would be returned by a subsequent call to IPositionHolder.next(). (Returns list size if the list iterator is at the end of the list.)
        Specified by:
        nextIndex in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        the index of the element that would be returned by a subsequent call to next, or list size if the list iterator is at the end of the list

      • previousIndex

        public int previousIndex()
        Description copied from interface: IPositionHolder
        Returns the index of the element that would be returned by a subsequent call to IPositionHolder.previous(). (Returns -1 if the list iterator is at the beginning of the list.)
        Specified by:
        previousIndex in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        the index of the element that would be returned by a subsequent call to previous, or -1 if the list iterator is at the beginning of the list

      • nextOrNull

        public P nextOrNull()
        Description copied from interface: IPositionHolder
        Return valid next position, with the same position anchor as this position, or null if does not exist. Does not throw exceptions
        Specified by:
        nextOrNull in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        next position or null

      • forwards

        public java.lang.Iterable<P> forwards()
        Description copied from interface: IPositionHolder
        iterable for this position and all following positions in increasing index order
        Specified by:
        forwards in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        iterable whose first element is this position, iteration proceeds toward index list.size()

      • nextForwards

        public java.lang.Iterable<P> nextForwards()
        Description copied from interface: IPositionHolder
        Iterator for all following positions, excluding this position in increasing index order
        Specified by:
        nextForwards in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        iterable whose first element is one after this position, iteration proceeds toward index list.size()

      • backwards

        public java.lang.Iterable<P> backwards()
        Description copied from interface: IPositionHolder
        Iterable for this position and all previous positions in decreasing index order
        Specified by:
        backwards in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        iterable whose first element is this position, iteration proceeds toward index 0

      • previousBackwards

        public java.lang.Iterable<P> previousBackwards()
        Description copied from interface: IPositionHolder
        iterable for all previous positions, excluding this position in decreasing index order
        Specified by:
        previousBackwards in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        iterable whose first element is previous to this position, iteration proceeds toward index 0

      • isValidIndex

        public boolean isValidIndex()
        Specified by:
        isValidIndex in interface IPosition<T,​P extends IPosition<T,​P>>
        Returns:
        true if index of this position is between 0 and size() of the list

      • isValidElement

        public boolean isValidElement()
        Specified by:
        isValidElement in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        true if this position represents a valid element in the list, ie. isValid() is true and index is at or before last element in list

      • get

        public T get()
        Specified by:
        get in interface IPosition<T,​P extends IPosition<T,​P>>
        Returns:
        get element at this position, throws IllegalStateException if current position is not valid or after last element of list

      • get

        public T get​(int offset)
        Description copied from interface: IPosition
        Insert element at index
        Specified by:
        get in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        offset - relative to this position, absolute index [0, size()], if absolute index == size() then element is added at the end of the list. The latter is also considered an insert at size() index.
        Returns:
        element

      • getOrNull

        public T getOrNull()
        Specified by:
        getOrNull in interface IPosition<T,​P extends IPosition<T,​P>>
        Returns:
        get element at this position or null if no such thing

      • getOrNull

        public T getOrNull​(int offset)
        Description copied from interface: IPosition
        Insert element at index
        Specified by:
        getOrNull in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        offset - relative to this position, absolute index [0, size()], if absolute index == size() then element is added at the end of the list. The latter is also considered an insert at size() index.
        Returns:
        element or null if for some reason the index or position are not valid

      • getOrNull

        public <S extends T> S getOrNull​(java.lang.Class<S> elementClass)
        Description copied from interface: IPosition
        Get the requested class or null if element at position cannot be cast to this class
        Specified by:
        getOrNull in interface IPosition<T,​P extends IPosition<T,​P>>
        Type Parameters:
        S - type of element
        Parameters:
        elementClass - class of element desired
        Returns:
        element of type or null

      • getOrNull

        public <S extends T> S getOrNull​(int offset,
                                 java.lang.Class<S> elementClass)
        Description copied from interface: IPosition
        Get the requested class or null if element at position cannot be cast to this class
        Specified by:
        getOrNull in interface IPosition<T,​P extends IPosition<T,​P>>
        Type Parameters:
        S - type of element
        Parameters:
        offset - relative to this position, absolute index [0, size()], if absolute index == size() then element is added at the end of the list. The latter is also considered an insert at size() index.
        elementClass - class of element desired
        Returns:
        element of type or null

      • set

        public void set​(T element)
        Specified by:
        set in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        element - to which to set the current element in the list throws IllegalStateException if current index is not valid

        If the current index is after the last element this will add the value to the end of the list treating as an insert, with corresponding updates to any positions that this would affect.

      • set

        public T set​(int offset,
             T element)
        Description copied from interface: IPosition
        Set element at given index
        Specified by:
        set in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        offset - relative to this position, absolute index [0, size()], if absolute index == size() then element is added at the end of the list. The latter is considered an insert at the index.
        element - value to set at offset
        Returns:
        element value at that position before. If adding at end of list then null is always returned.

      • add

        public boolean add​(T element)
        Specified by:
        add in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        element - to insert after the current position in the list, not at the end of the list as a regular List does. throws IllegalStateException if current index is not valid
        Returns:
        true

      • add

        public boolean add​(int offset,
                   T element)
        Description copied from interface: IPosition
        Add element at position given by relative offset to current position.

        NOTE: The position of insert is changed, depending on what has happened to the elements around the current position since it was instantiated: if element at position was deleted then offset 0 and 1 have the same effect, insert element before next.

        0 will always insert before the current position, so add(0, item1) will insert before current position, which advances the position to keep up with the current element. Next add(0, item2) will insert item2 after item1.

        Specified by:
        add in interface IPosition<T,​P extends IPosition<T,​P>>
        Parameters:
        offset - offset, can be negative. 0 means insert before current, 1 means after current, -1 means before previous
        element - to insert
        Returns:
        true

      • addAll

        public boolean addAll​(@NotNull
                      java.util.Collection<T> elements)
        Specified by:
        addAll in interface IPosition<T,​P extends IPosition<T,​P>>

      • addAll

        public boolean addAll​(int offset,
                      @NotNull
                      java.util.Collection<T> elements)
        Specified by:
        addAll in interface IPosition<T,​P extends IPosition<T,​P>>

      • remove

        public T remove()
        Specified by:
        remove in interface IPosition<T,​P extends IPosition<T,​P>>
        Specified by:
        remove in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Returns:
        removed current element, throws IllegalStateException if current index is not valid or after last element of list

      • remove

        public void remove​(int startOffset,
                   int endOffset)
        Specified by:
        remove in interface IPosition<T,​P extends IPosition<T,​P>>

      • maxOffset

        public int maxOffset()
        Specified by:
        maxOffset in interface IPosition<T,​P extends IPosition<T,​P>>
        Returns:
        max offset from current position

      • minOffset

        public int minOffset()
        Specified by:
        minOffset in interface IPosition<T,​P extends IPosition<T,​P>>
        Returns:
        min offset from current position to 0

      • indexOf

        public P indexOf​(@NotNull
                 java.util.function.Predicate<P> predicate)
        Specified by:
        indexOf in interface IPosition<T,​P extends IPosition<T,​P>>

      • indexOf

        public P indexOf​(int offset,
                 @NotNull
                 java.util.function.Predicate<P> predicate)
        Specified by:
        indexOf in interface IPosition<T,​P extends IPosition<T,​P>>

      • lastIndexOf

        public P lastIndexOf​(@NotNull
                     java.util.function.Predicate<P> predicate)
        Specified by:
        lastIndexOf in interface IPosition<T,​P extends IPosition<T,​P>>

      • lastIndexOf

        public P lastIndexOf​(int offset,
                     @NotNull
                     java.util.function.Predicate<P> predicate)
        Specified by:
        lastIndexOf in interface IPosition<T,​P extends IPosition<T,​P>>

      • equals

        public final boolean equals​(java.lang.Object o)
        Description copied from interface: IPositionHolder
        Listeners should not change hashCode() or equals() from their default implementation where the instance is only equal to itself. Otherwise, a new instance can remove an old one from the weak hash map used to hold listener instances.
        Specified by:
        equals in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Overrides:
        equals in class java.lang.Object
        Returns:
        hash

      • hashCode

        public final int hashCode()
        Description copied from interface: IPositionHolder
        Listeners should not change hashCode() or equals() from their default implementation where the instance is only equal to itself. Otherwise, a new instance can remove an old one from the weak hash map used to hold listener instances.
        Specified by:
        hashCode in interface IPositionHolder<T,​P extends IPosition<T,​P>>
        Overrides:
        hashCode in class java.lang.Object
        Returns:
        hash

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object