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80 lines
1.5 KiB
80 lines
1.5 KiB
/*
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* Copyright 2020-2021 the original author(https://github.com/wj596)
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*
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* <p>
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* </p>
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*/
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package collections
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import "sync"
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type List struct {
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lock sync.RWMutex //互斥锁
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elements []interface{}
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size int
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}
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func NewList(values ...interface{}) *List {
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l := &List{}
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if len(values) > 0 {
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l.Add(values...)
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}
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return l
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}
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func (s *List) within(index int) bool {
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return index >= 0 && index < s.size
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}
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func (s *List) Add(values ...interface{}) {
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s.lock.Lock()
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defer s.lock.Unlock()
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if len(values) > 0 {
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s.elements = append(s.elements, values)
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s.size = s.size + len(values)
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}
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}
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func (s *List) Get(index int) interface{} {
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s.lock.RLock()
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defer s.lock.RUnlock()
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if !s.within(index) {
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return nil
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}
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return s.elements[index]
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}
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func (s *List) Remove(index int) {
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s.lock.Lock()
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defer s.lock.Unlock()
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if !s.within(index) {
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return
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}
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s.elements = append(s.elements[:index], s.elements[index+1:]...)
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s.size--
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}
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func (s *List) Size() int {
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s.lock.RLock()
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defer s.lock.RUnlock()
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return s.size
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}
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