[HADOOP-8320] FileSystem#checkPath and AbstractFileSystem#checkPath should share code - ASF JIRA

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Release Note:

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Moved the checkPath logic from the AbstractFileSystem and FileSystem classes to a "checkFileSystemPath" method in the Path class. The AbstracFileSystem and FileSystem checkPath method will call the common code in checkFileSystemPath (adapter pattern). This is because the two classes aren't derived from any common ancestor.

There are no new test cases because existing test cases test the functionality that is being refactored. Adding new test cases would be redundant.

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Moved the checkPath logic from the AbstractFileSystem and FileSystem classes to a "checkFileSystemPath" method in the Path class. The AbstracFileSystem and FileSystem checkPath method will call the common code in checkFileSystemPath (adapter pattern). This is because the two classes aren't derived from any common ancestor. There are no new test cases because existing test cases test the functionality that is being refactored. Adding new test cases would be redundant.

Per the discussion on ~~HADOOP-8310~~, these two methods can be refactored to share some code.