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S-Expression support for Java

There is a newer version: 0.2

package com.laamella.sexpression.visitor;

import com.laamella.sexpression.model.Atom;
import com.laamella.sexpression.model.AtomList;
import com.laamella.sexpression.model.Comment;
import com.laamella.sexpression.model.SExpression;

public class PrinterVisitor implements Visitor {
    public static final PrinterVisitor TO_STRING = new PrinterVisitor();

    @Override
    public Void accept(Atom atom, Appendable output) throws Exception {
        for (char c : atom.value.toCharArray()) {
            if (Character.isWhitespace(c)) {
                output.append('"').append(atom.value).append('"');
                return null;
            }
        }
        output.append(atom.value);
        return null;
    }

    @Override
    public Void accept(AtomList atomList, Appendable output) throws Exception {
        output.append('(');
        String space = "";
        for (SExpression n : atomList.values) {
            output.append(space);
            n.visit(this, output);
            space = " ";
        }
        output.append(')');
        return null;
    }

    @Override
    public Void accept(Comment comment, Appendable output) throws Exception {
        return null;
    }
}