Hi Sreenidhi,
Trunk is the best place to explore the source of JBoss Tools: http://anonsvn.jboss.org/repos/jbosstools/trunk/ .
There is a simple folder structure inside trunk: COMPONENT_NAME/plugins/PLUGIN_NAME/src/JAVA_FILES.
Just press Ctrl-Shift-F1 to get the name of the class of the opened editor. For example, for the Faces Config editor you should get: org.jboss.tools.jsf.ui.editor.FacesConfigEditor. The path for it will be /trunk/jsf/plugins/org.jboss.tools.jsf.ui/src/org/jboss/tools/jsf/ui/editor/FacesConfigEditor.java