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DataStorage.attach   A

↳ Parent: DataStorage

Complexity

Conditions 1

Size

Total Lines 7
Code Lines 7

Duplication

Lines 0
Ratio 0 %

Code Coverage

Tests 4
CRAP Score 1

Importance

Changes 0
Metric Value
cc 1
eloc 7
dl 0
loc 7
ccs 4
cts 4
cp 1
crap 1
rs 10
c 0
b 0
f 0
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import {IObserverAdapter, IOnChangeCallback} from '../Observer/Observer';
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import StorageAdapter from './StorageAdapter';
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export interface IAdapterDictionary {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  [index: string]: StorageAdapter<any>

            


            
                                                                                                            
                            
            
                                    
            
            

                
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}

            


            
                                                                                                            
                            
            
                                    
            
            

                
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export default class DataStorage {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  protected domain: string;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  protected storage: Storage;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  protected adapters: IAdapterDictionary;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  constructor(domain: string, storage: Storage) {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    this.domain = domain;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    this.storage = storage;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    this.adapters = {};

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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  }

            


            
                                                                        
                            
            
                                    
            
            

                
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  attach<T>(key: string, adapter: IObserverAdapter<T>): StorageAdapter<T> {

            


            
                                                                        
                            
            
                                    
            
            

                
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    const callback: IOnChangeCallback<T> = (oldValue: T, newValue: T) => this.updateStorage(key, newValue);

            


            
                                                                        
                            
            
                                    
            
            

                
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    const storageAdapter: StorageAdapter<T> = new StorageAdapter<T>(adapter, callback);

            


            
                                                                        
                            
            
                                    
            
            

                
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    this.adapters[key] = storageAdapter;

            


            
                                                                        
                            
            
                                    
            
            

                
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    return storageAdapter;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  loadData<T>(key: string, initialValue: T): T {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    const initJSON: string | null = this.storage.getItem(this.domain + '::' + key);

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    let data: T = initialValue;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    if (initJSON != null) {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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      data = JSON.parse(initJSON) as T;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    return data;

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  }

            


            
                                                                                                            
                            
            
                                    
            
            

                
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  protected updateStorage<T>(key: string, newValue: T) {

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    this.storage.setItem(this.domain + '::' + key, JSON.stringify(newValue));

            


            
                                                                                                            
                                                                
            
                                    
            
            

                
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  }

            


            
                                                        
            
                                    
            
            

                
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}