redblacktree

Documentation

Overview

Package redblacktree implements a red-black tree.

Used by TreeSet and TreeMap.

Structure is not thread safe.

References: http://en.wikipedia.org/wiki/Red%E2%80%93black_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) NextTo(f func(key interface{}, value interface{}) bool) bool
  • func (iterator *Iterator) Node() *Node
  • func (iterator *Iterator) Prev() bool
  • func (iterator *Iterator) PrevTo(f func(key interface{}, value interface{}) bool) bool
  • func (iterator *Iterator) Value() interface{}
• type Node
  • func (node *Node) Size() int
  • func (node *Node) String() string
• type Tree
  • func NewWith(comparator utils.Comparator) *Tree
  • func NewWithIntComparator() *Tree
  • func NewWithStringComparator() *Tree
  • func (tree *Tree) Ceiling(key interface{}) (ceiling *Node, found bool)
  • func (tree *Tree) Clear()
  • func (tree *Tree) Empty() bool
  • func (tree *Tree) Floor(key interface{}) (floor *Node, found bool)
  • func (tree *Tree) FromJSON(data []byte) error
  • func (tree *Tree) Get(key interface{}) (value interface{}, found bool)
  • func (tree *Tree) GetNode(key interface{}) *Node
  • func (tree *Tree) Iterator() Iterator
  • func (tree *Tree) IteratorAt(node *Node) Iterator
  • func (tree *Tree) Keys() []interface{}
  • func (tree *Tree) Left() *Node
  • func (tree *Tree) MarshalJSON() ([]byte, error)
  • func (tree *Tree) Put(key interface{}, value interface{})
  • func (tree *Tree) Remove(key interface{})
  • func (tree *Tree) Right() *Node
  • func (tree *Tree) Size() int
  • func (tree *Tree) String() string
  • func (tree *Tree) ToJSON() ([]byte, error)
  • func (tree *Tree) UnmarshalJSON(bytes []byte) error
  • func (tree *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) NextTo

func (iterator *Iterator) NextTo(f func(key interface{}, value interface{}) bool) bool

NextTo moves the iterator to the next element from current position that satisfies the condition given by the passed function, and returns true if there was a next element in the container. If NextTo() returns true, then next element's key and value can be retrieved by Key() and Value(). Modifies the state of the iterator.

func (*Iterator) Node

func (iterator *Iterator) Node() *Node

Node returns the current element's node. Does not modify the state of the iterator.

func (*Iterator) Prev

func (iterator *Iterator) Prev() bool

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

func (*Iterator) PrevTo

func (iterator *Iterator) PrevTo(f func(key interface{}, value interface{}) bool) bool

PrevTo moves the iterator to the previous element from current position that satisfies the condition given by the passed function, and returns true if there was a next element in the container. If PrevTo() returns true, then next element's key and value can be retrieved by Key() and Value(). 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{}

	Left   *Node
	Right  *Node
	Parent *Node
	// contains filtered or unexported fields
}

Node is a single element within the tree

func (*Node) Size

func (node *Node) Size() int

Size returns the number of elements stored in the subtree. Computed dynamically on each call, i.e. the subtree is traversed to count the number of the nodes.

func (*Node) String

func (node *Node) String() string

type Tree

type Tree struct {
	Root *Node

	Comparator utils.Comparator
	// contains filtered or unexported fields
}

Tree holds elements of the red-black tree

func NewWith

func NewWith(comparator utils.Comparator) *Tree

NewWith instantiates a red-black tree with the custom comparator.

func NewWithIntComparator

func NewWithIntComparator() *Tree

NewWithIntComparator instantiates a red-black tree with the IntComparator, i.e. keys are of type int.

func NewWithStringComparator

func NewWithStringComparator() *Tree

NewWithStringComparator instantiates a red-black tree with the StringComparator, i.e. keys are of type string.

func (*Tree) Ceiling

func (tree *Tree) Ceiling(key interface{}) (ceiling *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 are smaller than the given node.

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

func (*Tree) Clear

func (tree *Tree) Clear()

Clear removes all nodes from the tree.

func (*Tree) Empty

func (tree *Tree) Empty() bool

Empty returns true if tree does not contain any nodes

func (*Tree) Floor

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

Floor Finds floor node of the input key, return the floor node or nil if no floor 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 are 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 (tree *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) GetNode

func (tree *Tree) GetNode(key interface{}) *Node

GetNode searches the node in the tree by key and returns its node or nil if key is not found in tree. Key should adhere to the comparator's type assertion, otherwise method panics.

func (*Tree) Iterator

func (tree *Tree) Iterator() Iterator

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

func (*Tree) IteratorAt

func (tree *Tree) IteratorAt(node *Node) Iterator

IteratorAt returns a stateful iterator whose elements are key/value pairs that is initialised at a particular node.

func (*Tree) Keys

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

Keys returns all keys in-order

func (*Tree) Left

func (tree *Tree) Left() *Node

Left returns the left-most (min) node or nil if tree is empty.

func (*Tree) MarshalJSON

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

MarshalJSON @implements json.Marshaler

func (*Tree) Put

func (tree *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 (tree *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 (tree *Tree) Right() *Node

Right returns the right-most (max) node or nil if tree is empty.

func (*Tree) Size

func (tree *Tree) Size() int

Size returns number of nodes in the tree.

func (*Tree) String

func (tree *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) UnmarshalJSON

func (tree *Tree) UnmarshalJSON(bytes []byte) error

UnmarshalJSON @implements json.Unmarshaler

func (*Tree) Values

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

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