title: Is it possible to customize label for each category in bar chart?
body: <p>Recently I get a requirement to create a bar chart that show data for each project. Here's an example :</p>
  
  <p><img src="https://i.stack.imgur.com/DhHkd.png" alt="Example of the bar chart"></p>
  
  <p>As you can see, the <code>Category</code> is the name of the project, and <code>Series</code> are different types of data in that project.</p>
  
  <p>However, since system dose not guarantee the uniqueness of project name, using it as categories can cause problem, and I will not able to use project name to generate URL for different projects. On the other hand, If I use unique id as category, I won't able to display the project name. This put me into a difficult situation.</p>
  
  <p>So my problem is :</p>
  
  <p>Is there a way to generate customize category label on the fly in JFreeChart ? </p>
  
  <p>Something similar to <code>CategoryItemLabelGenerator</code> but for category itself. So I can use unique Id as category, but display project name in chart.</p>