/
hashset.go
90 lines (77 loc) · 2.04 KB
/
hashset.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gxset
import (
"fmt"
"strings"
)
var itemExists = struct{}{}
type HashSet struct {
Items map[interface{}]struct{}
}
func NewSet(values ...interface{}) *HashSet {
set := &HashSet{Items: make(map[interface{}]struct{})}
if len(values) > 0 {
set.Add(values...)
}
return set
}
func (set *HashSet) Add(items ...interface{}) {
for _, item := range items {
set.Items[item] = itemExists
}
}
func (set *HashSet) Remove(items ...interface{}) {
for _, item := range items {
delete(set.Items, item)
}
}
func (set *HashSet) Contains(items ...interface{}) bool {
for _, item := range items {
if _, contains := set.Items[item]; !contains {
return false
}
}
return true
}
func (set *HashSet) Empty() bool {
return set.Size() == 0
}
func (set *HashSet) Size() int {
return len(set.Items)
}
func (set *HashSet) Clear() {
set.Items = make(map[interface{}]struct{})
}
func (set *HashSet) Values() []interface{} {
values := make([]interface{}, set.Size())
count := 0
for item := range set.Items {
values[count] = item
count++
}
return values
}
func (set *HashSet) String() string {
str := "HashSet\n"
var items []string
for k := range set.Items {
items = append(items, fmt.Sprintf("%v", k))
}
str += strings.Join(items, ", ")
return str
}