[PR] CAY-2833 Unify code related to the Cayenne model paths processing [cayenne]

["stariy95 (via GitHub)" <gi...@apache.org>]

stariy95 opened a new pull request, #597:
URL: https://github.com/apache/cayenne/pull/597

   This PR introduces `CayennePath` and `CayennePathSegment` classes (that should be value objects, but that's still not a thing in Java). 
   It allows to make any path-related logic more transparent and precise.
   There are some minor incompatibilities introduced. They are all just changes of the return type in several methods from `String` to `CayennePath` (like `ObjRelationship.getDbRelationshipPath()` method), so shouldn't be a big problem.
   
   Here are some examples of it's usage: 
   ```java
   // 1. concatenate paths
   CayennePath key = parentPath == null
                   ? path.dot(entity.getName())
                   : parentPath.dot(path).dot(entity.getName());
   
   // 2. mark the last path segment as outer join
   CayennePathSegment last = getPath().last();
   CayennePath outerPath = getPath().parent()
       .dot(last.withModifier(CayennePath.OUTER_MODIFIER))
   
   // 3. get tail of the path
   CayennePath pathRemainder = path.tail(1);
   ```
   
   


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Re: [PR] CAY-2833 Unify code related to the Cayenne model paths processing [cayenne]

["stariy95 (via GitHub)" <gi...@apache.org>]

stariy95 merged PR #597:
URL: https://github.com/apache/cayenne/pull/597


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