question: public void checkOptionsValid ( ) { if ( alias_ratio < 0 || alias_ratio > 1 ) { throw new RuntimeException ( "Alias ratio must be between 0 and 1, inclusive." ) ; } if ( null_ratio < 0 || null_ratio > 1 ) { throw new RuntimeException ( "Null ratio must be between 0 and 1, inclusive." ) ; } if ( maxsize <= 0 ) { throw new RuntimeException ( "Maximum sequence size must be greater than zero but was " + maxsize ) ; } if ( ! literals_file . isEmpty ( ) && literals_level == ClassLiteralsMode . NONE ) { throw new RuntimeException ( "Invalid parameter combination: specified a class literal file but --use-class-literals=NONE" ) ; } }
target:  Check that the options given satisfy any specified constraints, and fail if they do not.