public MustacheEngineBuilder addContextConverter(ContextConverter converter) {
        checkArgumentNotNull(converter);
        checkNotBuilt();
        this.contextConverters.add(converter);
        return this;
    }
public MustacheEngineBuilder addContextConverter(ContextConverter converter) {
        checkArgumentNotNull(converter);
        checkNotBuilt();
        this.contextConverters.add(converter);
        return this;
    }
public MustacheEngineBuilder addContextConverter ( ContextConverter converter ) { checkArgumentNotNull ( converter ) ; checkNotBuilt ( ) ; this . contextConverters . add ( converter ) ; return this ; }
Add a context converter.

@param converter
@return self
Add a context converter .