AdbWrapperFactory.js

const _fs_ = require("fs");
const AdbWrapper = require("./AdbWrapper");
var gInstance = null;
/**
 * To create AdbWrapper instances : generic or pre-associated to a device
 * 
 * @class
 * @author Georges-B. MICHEL
 */
class AdbWrapperFactory
{
    /**
     * 
     * @param {require('path').Path} pAdbPath Path to ADB binary
     * @constructor
     */
    constructor( pAdbPath){
        this.path = pAdbPath;
    }
    /**
     * To check if ADB server is ready
     * 
     * @returns {Boolean} TRUE if ADB is reeady, else FALSE
     * @method
     */
    isReady(){
        return (this.path != null) && (_fs_.existsSync(this.path));
    }
    /**
     * 
     * @param {require('path').Path} pAdbPath Path to ADB binary
     * @returns {AdbWrapperFactory} AdbWrapper factory
     * @method
     * @static
     */
    static getInstance( pAdbPath, pOverride = false){
        if(gInstance == null || pOverride==true){
            if(_fs_.existsSync(pAdbPath)){
                gInstance = new AdbWrapperFactory( pAdbPath);
            }else{
                throw new Error("[ADB WRAPPER] ADB binary '"+pAdbPath+"' is not found.");
            }
        }
        return gInstance;
    }
    /**
     * To create a generic AdbWrapper
     * 
     * Commands executed by this wrapper not contain device ID (-u / -s / -e)
     * 
     * @method
     * @returns {AdbWrapper} AdbWrapper instance
     * @public
     * @method
     */
    newGenericWrapper(){
        return new AdbWrapper( gInstance.path);
    }
     /**
     * To create a device-specific AdbWrapper
     * 
     * For each commands issued by this wrapper,  the device ID is specified
     * 
     * @method
     * @returns {AdbWrapper} AdbWrapper instance
     * @public
     * @method
     */
    newSpecificWrapper( pDevice){
        
        return pDevice.bridge.clone();
    }
}
module.exports = AdbWrapperFactory;