question: returns singleton instance of propertiessupport . concode_field_sep PropertiesSupport INSTANCE concode_elem_sep Map<PropertiesProvider,Class<? extends DataSource>> providers concode_field_sep PropertiesCustomizer<X> getCustomizer concode_elem_sep PropertiesCustomizer<X> getCustomizer concode_elem_sep List<PropertiesProvider<X>> getProviders concode_elem_sep void registerPropertiesProvider concode_elem_sep void openProperties concode_elem_sep void openProperties concode_elem_sep void unregisterPropertiesProvider concode_elem_sep boolean hasProperties concode_elem_sep boolean hasProperties concode_elem_sep boolean hasProperties
target: PropertiesSupport function ( ) { if ( INSTANCE == null ) INSTANCE = new PropertiesSupport ( ) ; return INSTANCE ; }