avltree

Documentation

Overview

Package avltree implements an AVL balanced binary tree.

Structure is not thread safe.

References: https://en.wikipedia.org/wiki/AVL_tree

Index

• type Iterator
  • func (iterator *Iterator) Begin()
  • func (iterator *Iterator) End()
  • func (iterator *Iterator) First() bool
  • func (iterator *Iterator) Key() interface{}
  • func (iterator *Iterator) Last() bool
  • func (iterator *Iterator) Next() bool
  • func (iterator *Iterator) Prev() bool
  • func (iterator *Iterator) Value() interface{}
• type Node
  • func (n *Node) Next() *Node
  • func (n *Node) Prev() *Node
  • func (n *Node) String() string
• type Tree
  • func NewWith(comparator util.Comparator) *Tree
  • func NewWithIntComparator() *Tree
  • func NewWithStringComparator() *Tree
  • func (t *Tree) Ceiling(key interface{}) (floor *Node, found bool)
  • func (t *Tree) Clear()
  • func (t *Tree) Empty() bool
  • func (t *Tree) Floor(key interface{}) (floor *Node, found bool)
  • func (tree *Tree) FromJSON(data []byte) error
  • func (t *Tree) Get(key interface{}) (value interface{}, found bool)
  • func (tree *Tree) Iterator() util.ReverseIteratorWithKey
  • func (t *Tree) Keys() []interface{}
  • func (t *Tree) Left() *Node
  • func (t *Tree) Put(key interface{}, value interface{})
  • func (t *Tree) Remove(key interface{})
  • func (t *Tree) Right() *Node
  • func (t *Tree) Size() int
  • func (t *Tree) String() string
  • func (tree *Tree) ToJSON() ([]byte, error)
  • func (t *Tree) Values() []interface{}

Types

type Iterator

type Iterator struct {
	// contains filtered or unexported fields
}

Iterator holding the iterator's state

func (*Iterator) Begin

func (iterator *Iterator) Begin()

Begin resets the iterator to its initial state (one-before-first) Call Next() to fetch the first element if any.

func (*Iterator) End

func (iterator *Iterator) End()

End moves the iterator past the last element (one-past-the-end). Call Prev() to fetch the last element if any.

func (*Iterator) First

func (iterator *Iterator) First() bool

First moves the iterator to the first element and returns true if there was a first element in the container. If First() returns true, then first element's key and value can be retrieved by Key() and Value(). Modifies the state of the iterator

func (*Iterator) Key

func (iterator *Iterator) Key() interface{}

Key returns the current element's key. Does not modify the state of the iterator.

func (*Iterator) Last

func (iterator *Iterator) Last() bool

Last moves the iterator to the last element and returns true if there was a last element in the container. If Last() returns true, then last element's key and value can be retrieved by Key() and Value(). Modifies the state of the iterator.

func (*Iterator) Next

func (iterator *Iterator) Next() bool

Next moves the iterator to the next element and returns true if there was a next element in the container. If Next() returns true, then next element's key and value can be retrieved by Key() and Value(). If Next() was called for the first time, then it will point the iterator to the first element if it exists. Modifies the state of the iterator.

func (*Iterator) Prev

func (iterator *Iterator) Prev() bool

Prev moves the iterator to the next element and returns true if there was a previous element in the container. If Prev() returns true, then next element's key and value can be retrieved by Key() and Value(). If Prev() was called for the first time, then it will point the iterator to the first element if it exists. Modifies the state of the iterator.

func (*Iterator) Value

func (iterator *Iterator) Value() interface{}

Value returns the current element's value. Does not modify the state of the iterator.

type Node

type Node struct {
	Key      interface{}
	Value    interface{}
	Parent   *Node    // Parent node
	Children [2]*Node // Children nodes
	// contains filtered or unexported fields
}

Node is a single element within the tree

func (*Node) Next

func (n *Node) Next() *Node

Next returns the next element in an inorder walk of the AVL tree.

func (*Node) Prev

func (n *Node) Prev() *Node

Prev returns the previous element in an inorder walk of the AVL tree.

func (*Node) String

func (n *Node) String() string

type Tree

type Tree struct {
	Root       *Node           // Root node
	Comparator util.Comparator // Key comparator
	// contains filtered or unexported fields
}

Tree holds elements of the AVL tree.

func NewWith

func NewWith(comparator util.Comparator) *Tree

NewWith instantiates an AVL tree with the custom comparator.

func NewWithIntComparator

func NewWithIntComparator() *Tree

NewWithIntComparator instantiates an AVL tree with the IntComparator, i.e. keys are of type int.

func NewWithStringComparator

func NewWithStringComparator() *Tree

NewWithStringComparator instantiates an AVL tree with the StringComparator, i.e. keys are of type string.

func (*Tree) Ceiling

func (t *Tree) Ceiling(key interface{}) (floor *Node, found bool)

Ceiling finds ceiling node of the input key, return the ceiling node or nil if no ceiling is found. Second return parameter is true if ceiling was found, otherwise false.

Ceiling node is defined as the smallest node that is larger than or equal to the given node. A ceiling node may not be found, either because the tree is empty, or because all nodes in the tree is smaller than the given node.

Key should adhere to the comparator's type assertion, otherwise method panics.

func (*Tree) Clear

func (t *Tree) Clear()

Clear removes all nodes from the tree.

func (*Tree) Empty

func (t *Tree) Empty() bool

Empty returns true if tree does not contain any nodes.

func (*Tree) Floor

func (t *Tree) Floor(key interface{}) (floor *Node, found bool)

Floor Finds floor node of the input key, return the floor node or nil if no ceiling is found. Second return parameter is true if floor was found, otherwise false.

Floor node is defined as the largest node that is smaller than or equal to the given node. A floor node may not be found, either because the tree is empty, or because all nodes in the tree is larger than the given node.

Key should adhere to the comparator's type assertion, otherwise method panics.

func (*Tree) FromJSON

func (tree *Tree) FromJSON(data []byte) error

FromJSON populates the tree from the input JSON representation.

func (*Tree) Get

func (t *Tree) Get(key interface{}) (value interface{}, found bool)

Get searches the node in the tree by key and returns its value or nil if key is not found in tree. Second return parameter is true if key was found, otherwise false. Key should adhere to the comparator's type assertion, otherwise method panics.

func (*Tree) Iterator

func (tree *Tree) Iterator() util.ReverseIteratorWithKey

Iterator returns a stateful iterator whose elements are key/value pairs.

func (*Tree) Keys

func (t *Tree) Keys() []interface{}

Keys returns all keys in-order

func (*Tree) Left

func (t *Tree) Left() *Node

Left returns the minimum element of the AVL tree or nil if the tree is empty.

func (*Tree) Put

func (t *Tree) Put(key interface{}, value interface{})

Put inserts node into the tree. Key should adhere to the comparator's type assertion, otherwise method panics.

func (*Tree) Remove

func (t *Tree) Remove(key interface{})

Remove remove the node from the tree by key. Key should adhere to the comparator's type assertion, otherwise method panics.

func (*Tree) Right

func (t *Tree) Right() *Node

Right returns the maximum element of the AVL tree or nil if the tree is empty.

func (*Tree) Size

func (t *Tree) Size() int

Size returns the number of elements stored in the tree.

func (*Tree) String

func (t *Tree) String() string

String returns a string representation of container

func (*Tree) ToJSON

func (tree *Tree) ToJSON() ([]byte, error)

ToJSON outputs the JSON representation of the tree.

func (*Tree) Values

func (t *Tree) Values() []interface{}

Values returns all values in-order based on the key.