org.eclipse.xtext.testing.GlobalRegistries.GlobalStateMemento Java Examples

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Example #1

Source File: CliTools.java From n4js with Eclipse Public License 1.0

5 votes

private <T> T withoutCorruptingGlobalState(Supplier<T> operation) {
	GlobalStateMemento originalGlobalState = GlobalRegistries.makeCopyOfGlobalState();
	try {
		return operation.get();
	} finally {
		originalGlobalState.restoreGlobalState();
	}
}

Example #2

Source File: N4CliHelper.java From n4js with Eclipse Public License 1.0

5 votes

/**
 * Copies the n4js libraries to the given testing workspace {@code location}.
 *
 * Only includes n4js libraries, for whose project name {@code n4jsLibrariesPredicate} returns {@code true}.
 *
 * @throws IOException
 *             In case the copying is not successful.
 */
public static void copyN4jsLibsToLocation(Path location, Predicate<N4JSProjectName> n4jsLibrariesPredicate)
		throws IOException {

	GlobalStateMemento originalGlobalState = null;
	if (!JSONStandaloneSetup.isSetUp()) {
		originalGlobalState = GlobalRegistries.makeCopyOfGlobalState();
		JSONStandaloneSetup.doSetup();
	}

	try {
		N4jsLibsAccess.installN4jsLibs(
				location,
				true,
				false, // do not use symbolic links (because some tests modify the files in the destination folder)
				false, // do not delete on exit (because tests using this method are responsible for cleaning up)
				libName -> !N4JS_LIBS_BLACKLIST.contains(libName) && n4jsLibrariesPredicate.test(libName));
	} finally {
		if (originalGlobalState != null) {
			// Restore the original global state (if we had to change it)
			// This is important for these cases in particular:
			// 1) tests that invoke N4jscBase#doMain() should run *without* any global setup, because #doMain()
			// should work if invoked from a plain Java main() method; if we provided the JSON setup as a
			// side-effect of this utility method we would "help" the implementation of #doMain() and might overlook
			// problems in #doMain()'s own setup.
			// 2) some tests deliberately run without any or with an incomplete setup in order to test some failure
			// behavior in this broken case.
			originalGlobalState.restoreGlobalState();
		}
	}
}