Hi devs,
I wanted to understand how Checkstyle computes the Class Fan out so I debugged
it.
Here are my findings:
* Some classes are excluded by default:
mIgnoredClassNames.add("boolean");
mIgnoredClassNames.add("byte");
mIgnoredClassNames.add("char");
mIgnoredClassNames.add("double");
mIgnoredClassNames.add("float");
mIgnoredClassNames.add("int");
mIgnoredClassNames.add("long");
mIgnoredClassNames.add("short");
mIgnoredClassNames.add("void");
mIgnoredClassNames.add("Boolean");
mIgnoredClassNames.add("Byte");
mIgnoredClassNames.add("Character");
mIgnoredClassNames.add("Double");
mIgnoredClassNames.add("Float");
mIgnoredClassNames.add("Integer");
mIgnoredClassNames.add("Long");
mIgnoredClassNames.add("Object");
mIgnoredClassNames.add("Short");
mIgnoredClassNames.add("String");
mIgnoredClassNames.add("StringBuffer");
mIgnoredClassNames.add("Void");
mIgnoredClassNames.add("ArrayIndexOutOfBoundsException");
mIgnoredClassNames.add("Exception");
mIgnoredClassNames.add("RuntimeException");
mIgnoredClassNames.add("IllegalArgumentException");
mIgnoredClassNames.add("IllegalStateException");
mIgnoredClassNames.add("IndexOutOfBoundsException");
mIgnoredClassNames.add("NullPointerException");
mIgnoredClassNames.add("Throwable");
mIgnoredClassNames.add("SecurityException");
mIgnoredClassNames.add("UnsupportedOperationException");
* All classes in java.lang.* are excluded too
* Annotation classes are not counted
* Classes in the same package are counted (they won't appear in import since
it's in the same package so don't count imports to get class fan out)
* Static method calls are not counted. So for example StringUtils from Commons
Lang never counts for class Fan out
* Enums are not counted (no new XXX() done. That's why static method calls are
not counted too BTW)
* Classes used in class extend or implement are not counted too.
Hope it helps
-Vincent
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