core/src/main/java/hudson/util/io/RewindableRotatingFileOutputStream.java [42:69]:
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        super(out);
        this.size = size;
    }

    protected File getNumberedFileName(int n) {
        if (n==0)   return out;
        return new File(out.getPath()+"."+n);
    }

    @Override
    public void rewind() throws IOException {
        super.rewind();
        for (int i=size-1;i>=0;i--) {
            File fi = getNumberedFileName(i);
            if (fi.exists()) {
                File next = getNumberedFileName(i+1);
                next.delete();
                fi.renameTo(next);
            }
        }
    }

    /**
     * Deletes all the log files, including rotated files.
     */
    public void deleteAll() {
        for (int i=0; i<=size; i++) {
            getNumberedFileName(i).delete();
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core/src/main/java/hudson/util/io/ReopenableRotatingFileOutputStream.java [43:70]:
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        super(out);
        this.size = size;
    }

    protected File getNumberedFileName(int n) {
        if (n==0)   return out;
        return new File(out.getPath()+"."+n);
    }

    @Override
    public void rewind() throws IOException {
        super.rewind();
        for (int i=size-1;i>=0;i--) {
            File fi = getNumberedFileName(i);
            if (fi.exists()) {
                File next = getNumberedFileName(i+1);
                next.delete();
                fi.renameTo(next);
            }
        }
    }

    /**
     * Deletes all the log files, including rotated files.
     */
    public void deleteAll() {
        for (int i=0; i<=size; i++) {
            getNumberedFileName(i).delete();
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