I have to say that I agree with Renjith here - the question is not really detailed enough. What does "access the entered jql query" mean?
Perhaps if you explained the end goal, what the users should see?
Refer the below link for starting with plugin development
https://developer.atlassian.com/display/JIRADEV/JIRA+Plugin+Guide
And refer this tutorial for adding new JQL function in JIRA
https://developer.atlassian.com/display/JIRADEV/Plugin+Tutorial+-+Adding+a+JQL+Function+to+JIRA
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And do what?
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