package adapter;

/**
 * Internally keeps an indentation counter that is initially 0.
 * Every indentation level is printed as two spaces.
 */
public interface TreePrinter {
    /**
     * Write a string, consider the current indentation.
     * 
     * @param str
     *            the string to be written
     */
    void println(String str);

    /** Increment the current indentation by one */
    void incIndent();

    /** Decrement the current indentation by one */
    void decIndent();
}