98 lines
2.4 KiB
Go
98 lines
2.4 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum 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
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package common
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import (
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"encoding/json"
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"reflect"
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"sync"
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)
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// The list type is an anonymous slice handler which can be used
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// for containing any slice type to use in an environment which
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// does not support slice types (e.g., JavaScript, QML)
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type List struct {
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mut sync.Mutex
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val interface{}
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list reflect.Value
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Length int
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}
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// Initialise a new list. Panics if non-slice type is given.
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func NewList(t interface{}) *List {
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list := reflect.ValueOf(t)
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if list.Kind() != reflect.Slice {
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panic("list container initialized with a non-slice type")
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}
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return &List{sync.Mutex{}, t, list, list.Len()}
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}
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func EmptyList() *List {
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return NewList([]interface{}{})
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}
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// Get N element from the embedded slice. Returns nil if OOB.
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func (self *List) Get(i int) interface{} {
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if self.list.Len() > i {
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self.mut.Lock()
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defer self.mut.Unlock()
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i := self.list.Index(i).Interface()
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return i
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}
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return nil
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}
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func (self *List) GetAsJson(i int) interface{} {
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e := self.Get(i)
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r, _ := json.Marshal(e)
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return string(r)
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}
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// Appends value at the end of the slice. Panics when incompatible value
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// is given.
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func (self *List) Append(v interface{}) {
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self.mut.Lock()
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defer self.mut.Unlock()
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self.list = reflect.Append(self.list, reflect.ValueOf(v))
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self.Length = self.list.Len()
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}
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// Returns the underlying slice as interface.
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func (self *List) Interface() interface{} {
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return self.list.Interface()
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}
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// For JavaScript <3
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func (self *List) ToJSON() string {
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// make(T, 0) != nil
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list := make([]interface{}, 0)
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for i := 0; i < self.Length; i++ {
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list = append(list, self.Get(i))
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}
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data, _ := json.Marshal(list)
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return string(data)
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}
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