import * as path from 'path' ; import * as fse from 'fs-extra' ; const ResFolder = path . join ( __dirname , '..' , '..' , 'res' ) ; export class ImagePlaceholder { private static _jpg : Buffer | undefined ; private static _png : Buffer | undefined ; private static _bmp : Buffer | undefined ; private static _gif : Buffer | undefined ; private constructor ( ) { } public static get JPG ( ) : Buffer { if ( ! this . _jpg ) { this . _jpg = fse . readFileSync ( path . join ( ResFolder , 'placeholder.jpg' ) ) ; } return this . _jpg ; } public static get PNG ( ) : Buffer { if ( ! this . _png ) { this . _png = fse . readFileSync ( path . join ( ResFolder , 'placeholder.png' ) ) ; } return this . _png ; } public static get BMP ( ) : Buffer { if ( ! this . _bmp ) { this . _bmp = fse . readFileSync ( path . join ( ResFolder , 'placeholder.bmp' ) ) ; } return this . _bmp ; } public static get GIF ( ) : Buffer { if ( ! this . _gif ) { this . _gif = fse . readFileSync ( path . join ( ResFolder , 'placeholder.gif' ) ) ; } return this . _gif ; } }