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113 lines
3.0 KiB
Go
113 lines
3.0 KiB
Go
/*
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Copyright (c) Emir Pasic, All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3.0 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library. See the file LICENSE included
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with this distribution for more information.
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*/
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// Implementation of an ordered set backed by a red-black tree.
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// Structure is not thread safe.
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// References: http://en.wikipedia.org/wiki/Set_%28abstract_data_type%29
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package treeset
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import (
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"fmt"
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"github.com/emirpasic/gods/sets"
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rbt "github.com/emirpasic/gods/trees/redblacktree"
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"github.com/emirpasic/gods/utils"
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"strings"
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)
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func assertInterfaceImplementation() {
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var _ sets.Interface = (*Set)(nil)
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}
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type Set struct {
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tree *rbt.Tree
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}
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var itemExists = struct{}{}
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// Instantiates a new empty set with the custom comparator.
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func NewWith(comparator utils.Comparator) *Set {
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return &Set{tree: rbt.NewWith(comparator)}
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}
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// Instantiates a new empty set with the IntComparator, i.e. keys are of type int.
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func NewWithIntComparator() *Set {
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return &Set{tree: rbt.NewWithIntComparator()}
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}
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// Instantiates a new empty set with the StringComparator, i.e. keys are of type string.
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func NewWithStringComparator() *Set {
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return &Set{tree: rbt.NewWithStringComparator()}
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}
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// Adds the items (one or more) to the set.
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func (set *Set) Add(items ...interface{}) {
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for _, item := range items {
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set.tree.Put(item, itemExists)
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}
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}
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// Removes the items (one or more) from the set.
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func (set *Set) Remove(items ...interface{}) {
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for _, item := range items {
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set.tree.Remove(item)
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}
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}
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// Check wether items (one or more) are present in the set.
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// All items have to be present in the set for the method to return true.
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// Returns true if no arguments are passed at all, i.e. set is always superset of empty set.
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func (set *Set) Contains(items ...interface{}) bool {
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for _, item := range items {
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if _, contains := set.tree.Get(item); !contains {
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return false
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}
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}
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return true
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}
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// Returns true if set does not contain any elements.
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func (set *Set) Empty() bool {
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return set.tree.Size() == 0
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}
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// Returns number of elements within the set.
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func (set *Set) Size() int {
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return set.tree.Size()
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}
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// Clears all values in the set.
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func (set *Set) Clear() {
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set.tree.Clear()
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}
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// Returns all items in the set.
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func (set *Set) Values() []interface{} {
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return set.tree.Keys()
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}
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func (set *Set) String() string {
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str := "TreeSet\n"
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items := []string{}
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for _, v := range set.tree.Keys() {
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items = append(items, fmt.Sprintf("%v", v))
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}
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str += strings.Join(items, ", ")
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return str
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}
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