String () { final StringBuilder buf = new StringBuilder(); if (group != null) { buf.append(group).append(':'); } if(name != null) { buf.append(name); } if (!"jar".equals(packaging)) { buf.append(':').append(packaging); } if (classifier != null) { buf.append(':').append(classifier); } if (version != null) { buf.append(':').append(version); } return buf.toString(); }