Return for changes the number of insertions and deletions

Change-Id: I71c97ce2075d2f012fe75bc2287e0e6a99cd5570
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

Documentation/rest-api-changes.txt

@@ -50,6 +50,8 @@ Query for open changes of watched projects:
       "created": "2012-07-17 07:18:30.854000000",
       "updated": "2012-07-17 07:19:27.766000000",
       "mergeable": true,
+      "insertions": 26,
+      "deletions": 10,
       "_sortkey": "001e7057000006dc",
       "_number": 1756,
       "owner": {
@@ -67,6 +69,8 @@ Query for open changes of watched projects:
       "created": "2012-07-17 07:18:30.884000000",
       "updated": "2012-07-17 07:18:30.885000000",
       "mergeable": true,
+      "insertions": 12,
+      "deletions": 18,
       "_sortkey": "001e7056000006dd",
       "_number": 1757,
       "owner": {
@@ -121,6 +125,8 @@ Query that retrieves changes for a user's dashboard:
         "created": "2012-07-17 07:18:30.854000000",
         "updated": "2012-07-17 07:19:27.766000000",
         "mergeable": true,
+        "insertions": 4,
+        "deletions": 7,
         "_sortkey": "001e7057000006dc",
         "_number": 1756,
         "owner": {
@@ -263,6 +269,8 @@ default. Optional fields are:
       "created": "2012-04-25 00:52:25.580000000",
       "updated": "2012-04-25 00:52:25.586000000",
       "mergeable": true,
+      "insertions": 16,
+      "deletions": 7,
       "_sortkey": "001c9bf400000061",
       "_number": 97,
       "owner": {
@@ -399,6 +407,8 @@ describes the change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 34,
+    "deletions": 101,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -449,6 +459,8 @@ describes the change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 126,
+    "deletions": 11,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -702,6 +714,8 @@ describes the abandoned change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 3,
+    "deletions": 310,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -761,6 +775,8 @@ describes the restored change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 2,
+    "deletions": 13,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -818,6 +834,8 @@ is included.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": false,
+    "insertions": 33,
+    "deletions": 9,
     "_sortkey": "0024cf9a000012bf",
     "_number": 4799,
     "owner": {
@@ -910,6 +928,8 @@ describes the reverting change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 6,
+    "deletions": 4,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -1402,6 +1422,8 @@ for the current patch set.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 34,
+    "deletions": 45,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -1585,6 +1607,8 @@ is included.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": false,
+    "insertions": 21,
+    "deletions": 21,
     "_sortkey": "0024cf9a000012bf",
     "_number": 4799,
     "owner": {
@@ -2513,6 +2537,8 @@ describes the resulting cherry picked change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 12,
+    "deletions": 11,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -2564,6 +2590,8 @@ describes the change.
     "created": "2013-02-01 09:59:32.126000000",
     "updated": "2013-02-21 11:16:36.775000000",
     "mergeable": true,
+    "insertions": 261,
+    "deletions": 101,
     "_sortkey": "0023412400000f7d",
     "_number": 3965,
     "owner": {
@@ -2759,6 +2787,10 @@ Only set if link:#reviewed[reviewed] is requested.
 |`mergeable`          |optional|
 Whether the change is mergeable. +
 Not set for merged changes.
+|`insertions`         ||
+Number of inserted lines.
+|`deletions`          ||
+Number of deleted lines.
 |`_sortkey`           ||The sortkey of the change.
 |`_number`            ||The legacy numeric ID of the change.
 |`owner`              ||

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeJson.java

@@ -77,6 +77,7 @@ import com.google.gerrit.server.account.AccountInfo;
 import com.google.gerrit.server.actions.ActionInfo;
 import com.google.gerrit.server.extensions.webui.UiActions;
 import com.google.gerrit.server.git.LabelNormalizer;
+import com.google.gerrit.server.patch.PatchListCache;
 import com.google.gerrit.server.patch.PatchListNotAvailableException;
 import com.google.gerrit.server.patch.PatchSetInfoFactory;
 import com.google.gerrit.server.patch.PatchSetInfoNotAvailableException;
@@ -84,6 +85,7 @@ import com.google.gerrit.server.project.ChangeControl;
 import com.google.gerrit.server.project.NoSuchProjectException;
 import com.google.gerrit.server.project.ProjectControl;
 import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gerrit.server.query.change.ChangeData.ChangedLines;
 import com.google.gwtorm.server.OrmException;
 import com.google.gwtorm.server.ResultSet;
 import com.google.inject.Inject;
@@ -137,6 +139,7 @@ public class ChangeJson {
   private final DynamicMap<DownloadCommand> downloadCommands;
   private final DynamicMap<RestView<ChangeResource>> changes;
   private final Revisions revisions;
+  private final PatchListCache patchListCache;
 
   private EnumSet<ListChangesOption> options;
   private AccountInfo.Loader accountLoader;
@@ -158,7 +161,8 @@ public class ChangeJson {
       DynamicMap<DownloadScheme> downloadSchemes,
       DynamicMap<DownloadCommand> downloadCommands,
       DynamicMap<RestView<ChangeResource>> changes,
-      Revisions revisions) {
+      Revisions revisions,
+      PatchListCache patchListCache) {
     this.db = db;
     this.labelNormalizer = ln;
     this.userProvider = user;
@@ -172,6 +176,7 @@ public class ChangeJson {
     this.downloadCommands = downloadCommands;
     this.changes = changes;
     this.revisions = revisions;
+    this.patchListCache = patchListCache;
 
     options = EnumSet.noneOf(ListChangesOption.class);
     projectControls = CacheBuilder.newBuilder()
@@ -268,6 +273,11 @@ public class ChangeJson {
     out.topic = in.getTopic();
     out.changeId = in.getKey().get();
     out.mergeable = in.getStatus() != Change.Status.MERGED ? in.isMergeable() : null;
+    ChangedLines changedLines = cd.changedLines(db, patchListCache);
+    if (changedLines != null) {
+      out.insertions = changedLines.insertions;
+      out.deletions = changedLines.deletions;
+    }
     out.subject = in.getSubject();
     out.status = in.getStatus();
     out.owner = accountLoader.get(in.getOwner());
@@ -912,6 +922,8 @@ public class ChangeJson {
     public Boolean starred;
     public Boolean reviewed;
     public Boolean mergeable;
+    public Integer insertions;
+    public Integer deletions;
 
     public String _sortkey;
     public int _number;

gerrit-server/src/main/java/com/google/gerrit/server/query/change/ChangeData.java

@@ -153,6 +153,7 @@ public class ChangeData {
   private ChangeControl changeControl;
   private List<ChangeMessage> messages;
   private List<SubmitRecord> submitRecords;
+  private ChangedLines changedLines;
   private boolean patchesLoaded;
 
   public ChangeData(final Change.Id id) {
@@ -243,6 +244,31 @@ public class ChangeData {
     return currentFiles;
   }
 
+  public ChangedLines changedLines(Provider<ReviewDb> db,
+      PatchListCache cache) throws OrmException {
+    if (changedLines == null) {
+      Change c = change(db);
+      if (c == null) {
+        return null;
+      }
+
+      PatchSet ps = currentPatchSet(db);
+      if (ps == null) {
+        return null;
+      }
+
+      PatchList p;
+      try {
+        p = cache.get(c, ps);
+      } catch (PatchListNotAvailableException e) {
+        return null;
+      }
+
+      changedLines = new ChangedLines(p.getInsertions(), p.getDeletions());
+    }
+    return changedLines;
+  }
+
   public Change.Id getId() {
     return legacyId;
   }
@@ -485,4 +511,14 @@ public class ChangeData {
   public String toString() {
     return Objects.toStringHelper(this).addValue(getId()).toString();
   }
+
+  public static class ChangedLines {
+    public final int insertions;
+    public final int deletions;
+
+    ChangedLines(int insertions, int deletions) {
+      this.insertions = insertions;
+      this.deletions = deletions;
+    }
+  }
 }