2018-04-16 21:01:23 +08:00
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// Copyright 2018 gf Author(https://gitee.com/johng/gf). All Rights Reserved.
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//
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// This Source Code Form is subject to the terms of the MIT License.
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// If a copy of the MIT was not distributed with this file,
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// You can obtain one at https://gitee.com/johng/gf.
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package garray
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import (
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"gitee.com/johng/gf/g/container/gtype"
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2018-09-05 18:34:41 +08:00
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"gitee.com/johng/gf/g/container/internal/rwmutex"
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2018-04-16 21:01:23 +08:00
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)
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// 默认按照从低到高进行排序
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type SortedIntArray struct {
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mu *rwmutex.RWMutex // 互斥锁
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cap int // 初始化设置的数组容量
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array []int // 底层数组
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unique *gtype.Bool // 是否要求不能重复
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compareFunc func(v1, v2 int) int // 比较函数,返回值 -1: v1 < v2;0: v1 == v2;1: v1 > v2
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}
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2018-09-06 14:48:55 +08:00
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// 创建一个排序的int数组
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func NewSortedIntArray(size int, cap int, safe...bool) *SortedIntArray {
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return &SortedIntArray {
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mu : rwmutex.New(safe...),
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array : make([]int, 0, cap),
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unique : gtype.NewBool(),
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compareFunc : func(v1, v2 int) int {
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if v1 < v2 {
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return -1
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}
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if v1 > v2 {
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return 1
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}
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return 0
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},
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}
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}
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// 添加加数据项
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func (a *SortedIntArray) Add(values...int) {
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if len(values) == 0 {
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return
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}
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for _, value := range values {
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index, cmp := a.Search(value)
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if a.unique.Val() && cmp == 0 {
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continue
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}
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a.mu.Lock()
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if index < 0 {
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a.array = append(a.array, value)
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a.mu.Unlock()
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continue
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}
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// 加到指定索引后面
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if cmp > 0 {
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index++
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}
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rear := append([]int{}, a.array[index : ]...)
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a.array = append(a.array[0 : index], value)
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a.array = append(a.array, rear...)
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a.mu.Unlock()
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}
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}
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// 获取指定索引的数据项, 调用方注意判断数组边界
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func (a *SortedIntArray) Get(index int) int {
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a.mu.RLock()
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defer a.mu.RUnlock()
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value := a.array[index]
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return value
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}
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// 删除指定索引的数据项, 调用方注意判断数组边界
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func (a *SortedIntArray) Remove(index int) {
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a.mu.Lock()
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defer a.mu.Unlock()
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a.array = append(a.array[ : index], a.array[index + 1 : ]...)
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}
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// 数组长度
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func (a *SortedIntArray) Len() int {
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a.mu.RLock()
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length := len(a.array)
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a.mu.RUnlock()
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return length
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}
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// 返回原始数据数组
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func (a *SortedIntArray) Slice() []int {
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array := ([]int)(nil)
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if a.mu.IsSafe() {
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a.mu.RLock()
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array = make([]int, len(a.array))
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for k, v := range a.array {
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array[k] = v
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}
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a.mu.RUnlock()
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} else {
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array = a.array
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}
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return array
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}
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// 查找指定数值的索引位置,返回索引位置(具体匹配位置或者最后对比位置)及查找结果
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// 返回值: 最后比较位置, 比较结果
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func (a *SortedIntArray) Search(value int) (int, int) {
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if len(a.array) == 0 {
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return -1, -2
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}
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a.mu.RLock()
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min := 0
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max := len(a.array) - 1
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mid := 0
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cmp := -2
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for {
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mid = int((min + max) / 2)
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cmp = a.compareFunc(value, a.array[mid])
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switch cmp {
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case -1 : max = mid - 1
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case 0 :
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case 1 : min = mid + 1
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}
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if cmp == 0 || min > max {
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break
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}
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}
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a.mu.RUnlock()
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return mid, cmp
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}
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// 设置是否允许数组唯一
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func (a *SortedIntArray) SetUnique(unique bool) {
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oldUnique := a.unique.Val()
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a.unique.Set(unique)
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if unique && oldUnique != unique {
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a.doUnique()
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}
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}
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// 清理数组中重复的元素项
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func (a *SortedIntArray) doUnique() {
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a.mu.Lock()
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i := 0
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for {
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if i == len(a.array) - 1 {
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break
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}
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if a.compareFunc(a.array[i], a.array[i + 1]) == 0 {
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a.array = append(a.array[ : i + 1], a.array[i + 1 + 1 : ]...)
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} else {
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i++
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}
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}
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a.mu.Unlock()
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}
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// 清空数据数组
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func (a *SortedIntArray) Clear() {
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a.mu.Lock()
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a.array = make([]int, 0, a.cap)
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a.mu.Unlock()
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}
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// 使用自定义方法执行加锁修改操作
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func (a *SortedIntArray) LockFunc(f func(array []int)) {
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a.mu.Lock(true)
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defer a.mu.Unlock(true)
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f(a.array)
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}
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// 使用自定义方法执行加锁读取操作
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func (a *SortedIntArray) RLockFunc(f func(array []int)) {
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a.mu.RLock(true)
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defer a.mu.RUnlock(true)
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f(a.array)
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}
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