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To learn more about Eclipse plugin development, it would be cool if I could read the implementation code for some of the Handler classes that support the built in Eclipse commands.
How I can find out the currently active handler class(es) for a specific command, such as for example org.eclipse.jdt.ui.navigate.open.type, in my current Eclipse instance? If this isn’t possible, what’s the best way in general to see what type of code implements that command?
To find the handler for a built-in function like “Open Type”, one can simply look at the source code for the appropriate Eclipse project plugin. For JDT, this is located at http://git.eclipse.org/c/jdt/eclipse.jdt.ui.git. The plugin.xml file at the root of the project specifies how commands are handled.
The Open Type command, for example, is handled by an Action, specifically OpenTypeAction in package org.eclipse.jdt.internal.ui.actions.