@incdevco/framework/aws/dynamo-db/expression-names/index.js

node.js lambda framework

module.exports = class ExpressionAttributeNames {
  
  constructor() {
    
    this._names = {};
    
  }
  
  determineKey(value) {
    
    let possibleKey = '#';
    
    let parts = value.split('.');
    
    possibleKey = parts[0];
    
    return possibleKey;
    
  }
  
  determineValue(value) {
    
    let possibleValue;
    
    let parts = value.split('.');
    
    possibleValue = parts[0];
    
    return possibleValue;
    
  }
  
  name(value, key) {
    
    if (key) {
      
      if (this._names[key]) {
        
        throw new Error('key already exists');
        
      }
      
    } else {
      
      key = this.determineKey(value);
      
    }
    
    this._names[key] = this.determineValue(value);
    
    return key;
    
  }
  
};