Fixes #1197, add Objects.requireNonNull and Preconditions.checkkNotNull to supported null-check styles

test/transform/resource/before/NonNullWithGuava.java

@@ -0,0 +1,33 @@
+//CONF: lombok.nonNull.exceptionType = Guava
+import static com.google.common.base.Preconditions.*;
+public class NonNullWithGuava {
+	@lombok.NonNull @lombok.Setter private String test;
+
+	public void testMethod(@lombok.NonNull String arg) {
+		System.out.println(arg);
+	}
+
+	public void testMethodWithCheck1(@lombok.NonNull String arg) {
+		checkNotNull(arg);
+	}
+
+	public void testMethodWithCheckAssign(@lombok.NonNull String arg) {
+		test = checkNotNull(arg);
+	}
+
+	public void testMethodWithCheck2(@lombok.NonNull String arg) {
+		com.google.common.base.Preconditions.checkNotNull(arg);
+	}
+
+	public void testMethodWithFakeCheck1(@lombok.NonNull String arg) {
+		checkNotNull("");
+	}
+
+	public void testMethodWithFakeCheck2(@lombok.NonNull String arg) {
+		com.google.common.base.Preconditions.checkNotNull(test);
+	}
+	
+	public void testMethodWithFakeCheckAssign(@lombok.NonNull String arg) {
+		test = checkNotNull(test);
+	}
+}