[stringtemplate-interest] Problem with fixed-length custom object renderer

[Frédéric Delanoy]

Hi All,

I'm trying to implement a custom object renderer to ouput fixed-length
data. I set an attribute to a list
of strings, and output it using a newline separator.
However, only the first line is correctly indented

Here's what I used:

public class TestStringTemplate_FixedLength {
    /** Renders a string by appending with spaces to get a minimal size */
    public static class FixesLengthRenderer implements AttributeRenderer {
        private final int length;
        public FixesLengthRenderer(int length) {
            this.length = length;
        }

        /** returns a char[] composed of n copies of character c, or
empty string if n < 1 */
        private char[] times(int n, char c) {
            if (n < 1) return new char[0];
            char[] cc = new char[n];
            for (int i = 0; i < cc.length; i++) cc[i] = c;
            return cc;
        }

        /** Returns a copy of s of size n; string value is truncated
or white-space-appended if needed */
        private String adaptStringToSize(String s, int size) {
            if (size < 1) return "";
            int len = s.length();
            StringBuilder sb = new StringBuilder(size);
            sb.append(s.substring(0, Math.min(len, size)));
            sb.append(times(size - len, ' '));
            return sb.toString();
        }
        public String toString(Object o) { return
adaptStringToSize((String) o, length); }
        public String toString(Object o, String formatName) { return
toString(o); }
    }

    public static void main(String[] args) {
        StringTemplate st= new StringTemplate("$elems:{$it$ foo};
separator=\"\n\"$");
        st.registerRenderer(String.class, new FixesLengthRenderer(6));
        st.setAttribute("elems", new String[] { "ABC", "DEFG" });
        System.out.println(st.toString());
    }
}

The output I have is:
ABC    foo
     DEFG   foo

Can s.o. please help?

Thanks in advance,

Frédéric Delanoy