@SuppressWarnings("unchecked")
                @Override
                protected StringExpression createResult(Class<? extends String> type, Expression<String> last) {
                    return Expressions.stringOperation(Ops.CASE, last);
                }
Initial state of Case construction

@author tiwe
querydsl-core/src/main/java/com/querydsl/core/types/dsl/CaseBuilder.java