public BooleanExpression isEmpty() {
        if (isempty == null) {
            isempty = Expressions.booleanOperation(Ops.STRING_IS_EMPTY, mixin);
        }
        return isempty;
    }
Create a {@code this.isEmpty()} expression

<p>Return true if this String is empty</p>

@return this.isEmpty()
@see java.lang.String#isEmpty()
querydsl-core/src/main/java/com/querydsl/core/types/dsl/StringExpression.java