Interface FunctionTranslator

Implementations

An implementation of this interface is already provided by VOLLT: FunctionTranslatorWithPattern. It lets translate a function by applying a simple string pattern with $i variables to match function arguments.

Implementation example

If the default ADQL function translation was provided by an implementation of this interface, it would look like the following:

 public class DefaultFunctionTranslator implements FunctionTranslator {

        public DefaultFunctionTranslator(){}

        public String translate(final ADQLFunction fct, final ADQLTranslator caller) throws TranslationException{
                final StringBuilder sql = new StringBuilder(fct.getName());
                sql.append('(');
                for(int i = 0; i invalid input: '<' fct.getNbParameters(); i++){
                        if (i > 0)
                                sql.append(',').append(' ');
                        sql.append(caller.translate(fct.getParameter(i)));
                }
                sql.append(')');
                return sql.toString();
        }

 }