This tutorial shows you how to install the Eclipse Snippet plugin if it’s not available. Snippets are part of the Web Developer Tools, specifically the WST Common UI. These tools don’t come with all packaged versions of Eclipse.
For Eclipse snippets that are useful for developing and customising Joomla!, visit http://www.theartofjoomla.com/snippets.html
For more help on using snippet, visit http://learn.theartofjoomla.com/developing-extensions/development-tools.html