question: private boolean isValid ( int type , String value ) { if ( value == null ) { return false ; } if ( ALLOWED_STRINGS [ type ] != null ) { return verifyStringGroup ( value , ALLOWED_STRINGS [ type ] ) ; } switch ( type ) { case TYPE_NUMBER : return verify ( value , DIGITS , null ) ; case TYPE_PIXELS_OR_PERCENTAGE : if ( value . endsWith ( "%" ) ) { value = value . substring ( 0 , value . length ( ) - 1 ) ; } else if ( value . endsWith ( "px" ) ) { value = value . substring ( 0 , value . length ( ) - 2 ) ; } return verify ( value , DIGITS , null ) ; case TYPE_CHAR : return verify ( value , DIGITS | ABC , null , 1 , 1 ) ; case TYPE_COLOR : if ( value . length ( ) == 0 ) { return false ; } if ( value . charAt ( 0 ) != '#' ) { return verifyStringGroup ( value , COLOR_STRINGS ) ; } else { return verify ( value . substring ( 1 ) , HEX , null , 3 , 6 ) ; } default : return true ; } }
target:  Verifies that the specified value conforms with the attribute's type restrictions. This basically checks the attribute type and according to that checks the value.