JGit - How to reuse the DiffFormatter

Multi tool use
Multi tool use












5















It's a followup question of jgit - git diff based on file extension.



I am trying to add the formatted diff to List<String> but If I try to use same DiffFormatter as below then previous entries getting appended to the next one.



List<String> changes = new LinkedList<>();
try (OutputStream outputStream = new ByteArrayOutputStream();
DiffFormatter diffFormatter = new DiffFormatter(outputStream)) {
diffFormatter.setRepository(git1.getRepository());
TreeFilter treeFilter = PathSuffixFilter.create(".txt");
diffFormatter.setPathFilter(treeFilter);
List<DiffEntry> entries = diffFormatter.scan(newTree, oldTree);
for (DiffEntry diffEntry : entries) {
diffFormatter.format(diffEntry);
changes.add(outputStream.toString());
diffFormatter.flush();
}
}


Therefore I forced to create a DIffFormatter for every diff entry.



Is there a better way to create List<String> from List<DiffEntry> without creating a new DiffFormatter every time?










share|improve this question



























    5















    It's a followup question of jgit - git diff based on file extension.



    I am trying to add the formatted diff to List<String> but If I try to use same DiffFormatter as below then previous entries getting appended to the next one.



    List<String> changes = new LinkedList<>();
    try (OutputStream outputStream = new ByteArrayOutputStream();
    DiffFormatter diffFormatter = new DiffFormatter(outputStream)) {
    diffFormatter.setRepository(git1.getRepository());
    TreeFilter treeFilter = PathSuffixFilter.create(".txt");
    diffFormatter.setPathFilter(treeFilter);
    List<DiffEntry> entries = diffFormatter.scan(newTree, oldTree);
    for (DiffEntry diffEntry : entries) {
    diffFormatter.format(diffEntry);
    changes.add(outputStream.toString());
    diffFormatter.flush();
    }
    }


    Therefore I forced to create a DIffFormatter for every diff entry.



    Is there a better way to create List<String> from List<DiffEntry> without creating a new DiffFormatter every time?










    share|improve this question

























      5












      5








      5








      It's a followup question of jgit - git diff based on file extension.



      I am trying to add the formatted diff to List<String> but If I try to use same DiffFormatter as below then previous entries getting appended to the next one.



      List<String> changes = new LinkedList<>();
      try (OutputStream outputStream = new ByteArrayOutputStream();
      DiffFormatter diffFormatter = new DiffFormatter(outputStream)) {
      diffFormatter.setRepository(git1.getRepository());
      TreeFilter treeFilter = PathSuffixFilter.create(".txt");
      diffFormatter.setPathFilter(treeFilter);
      List<DiffEntry> entries = diffFormatter.scan(newTree, oldTree);
      for (DiffEntry diffEntry : entries) {
      diffFormatter.format(diffEntry);
      changes.add(outputStream.toString());
      diffFormatter.flush();
      }
      }


      Therefore I forced to create a DIffFormatter for every diff entry.



      Is there a better way to create List<String> from List<DiffEntry> without creating a new DiffFormatter every time?










      share|improve this question














      It's a followup question of jgit - git diff based on file extension.



      I am trying to add the formatted diff to List<String> but If I try to use same DiffFormatter as below then previous entries getting appended to the next one.



      List<String> changes = new LinkedList<>();
      try (OutputStream outputStream = new ByteArrayOutputStream();
      DiffFormatter diffFormatter = new DiffFormatter(outputStream)) {
      diffFormatter.setRepository(git1.getRepository());
      TreeFilter treeFilter = PathSuffixFilter.create(".txt");
      diffFormatter.setPathFilter(treeFilter);
      List<DiffEntry> entries = diffFormatter.scan(newTree, oldTree);
      for (DiffEntry diffEntry : entries) {
      diffFormatter.format(diffEntry);
      changes.add(outputStream.toString());
      diffFormatter.flush();
      }
      }


      Therefore I forced to create a DIffFormatter for every diff entry.



      Is there a better way to create List<String> from List<DiffEntry> without creating a new DiffFormatter every time?







      java jgit






      share|improve this question













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      share|improve this question










      asked Jan 3 at 9:14









      nantitvnantitv

      1,2901629




      1,2901629
























          1 Answer
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          The cause for the previous entries getting appended is that the same output stream is used. Calling outputStream.toString() returns a string of all the bytes that have been written so far. Hence each calling toString within the for loop will return all previously created diffs, plus the current one.



          I see two ways of solving this issue:




          • Use a separate DiffFormatter within the for loop for each diff entry.


          • Implement a custom OutputStream that allows to discard previously written content.







          share|improve this answer
























          • Thanks for confirming it.

            – nantitv
            Jan 3 at 11:27











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          The cause for the previous entries getting appended is that the same output stream is used. Calling outputStream.toString() returns a string of all the bytes that have been written so far. Hence each calling toString within the for loop will return all previously created diffs, plus the current one.



          I see two ways of solving this issue:




          • Use a separate DiffFormatter within the for loop for each diff entry.


          • Implement a custom OutputStream that allows to discard previously written content.







          share|improve this answer
























          • Thanks for confirming it.

            – nantitv
            Jan 3 at 11:27
















          2














          The cause for the previous entries getting appended is that the same output stream is used. Calling outputStream.toString() returns a string of all the bytes that have been written so far. Hence each calling toString within the for loop will return all previously created diffs, plus the current one.



          I see two ways of solving this issue:




          • Use a separate DiffFormatter within the for loop for each diff entry.


          • Implement a custom OutputStream that allows to discard previously written content.







          share|improve this answer
























          • Thanks for confirming it.

            – nantitv
            Jan 3 at 11:27














          2












          2








          2







          The cause for the previous entries getting appended is that the same output stream is used. Calling outputStream.toString() returns a string of all the bytes that have been written so far. Hence each calling toString within the for loop will return all previously created diffs, plus the current one.



          I see two ways of solving this issue:




          • Use a separate DiffFormatter within the for loop for each diff entry.


          • Implement a custom OutputStream that allows to discard previously written content.







          share|improve this answer













          The cause for the previous entries getting appended is that the same output stream is used. Calling outputStream.toString() returns a string of all the bytes that have been written so far. Hence each calling toString within the for loop will return all previously created diffs, plus the current one.



          I see two ways of solving this issue:




          • Use a separate DiffFormatter within the for loop for each diff entry.


          • Implement a custom OutputStream that allows to discard previously written content.








          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jan 3 at 10:13









          Rüdiger HerrmannRüdiger Herrmann

          15.6k103353




          15.6k103353













          • Thanks for confirming it.

            – nantitv
            Jan 3 at 11:27



















          • Thanks for confirming it.

            – nantitv
            Jan 3 at 11:27

















          Thanks for confirming it.

          – nantitv
          Jan 3 at 11:27





          Thanks for confirming it.

          – nantitv
          Jan 3 at 11:27




















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