Show the depends on and needed by lists on a change page

The lists are automatically expanded open if there is a
dependency which is not yet merged and we are still open.

Signed-off-by: Shawn O. Pearce <sop@google.com>

webapp/src/com/google/gerrit/client/changes/ChangeListServiceImpl.java

@@ -152,9 +152,8 @@ public class ChangeListServiceImpl extends BaseServiceImplementation implements
       final Set<Change.Id> starred, final AccountInfoCacheFactory accts) {
     final ArrayList<ChangeInfo> r = new ArrayList<ChangeInfo>();
     for (final Change c : rs) {
-      final ChangeInfo ci = new ChangeInfo(c);
+      final ChangeInfo ci = new ChangeInfo(c, accts);
       ci.setStarred(starred.contains(ci.getId()));
-      accts.want(c.getOwner());
       r.add(ci);
     }
     return r;

webapp/src/com/google/gerrit/client/changes/ChangeScreen.java

@@ -191,7 +191,21 @@ public class ChangeScreen extends Screen {
     addPatchSets(detail);
     addMessages(detail);
 
+    // If any dependency change is still open, show our dependency list.
+    //
+    boolean depsOpen = false;
+    if (!detail.getChange().getStatus().isClosed()
+        && detail.getDependsOn() != null) {
+      for (final ChangeInfo ci : detail.getDependsOn()) {
+        if (ci.getStatus() != Change.Status.MERGED) {
+          depsOpen = true;
+          break;
+        }
+      }
+    }
+
     descriptionPanel.setOpen(true);
+    dependenciesPanel.setOpen(depsOpen);
     approvalsPanel.setOpen(true);
   }
 

webapp/src/com/google/gerrit/client/data/ChangeDetail.java

@@ -20,6 +20,7 @@ import com.google.gerrit.client.reviewdb.Change;
 import com.google.gerrit.client.reviewdb.ChangeApproval;
 import com.google.gerrit.client.reviewdb.ChangeMessage;
 import com.google.gerrit.client.reviewdb.PatchSet;
+import com.google.gerrit.client.reviewdb.PatchSetAncestor;
 import com.google.gerrit.client.reviewdb.ReviewDb;
 import com.google.gwtorm.client.OrmException;
 
@@ -27,7 +28,9 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
 
 /** Detail necessary to display{@link ChangeScreen}. */
 public class ChangeDetail {
@@ -83,6 +86,51 @@ public class ChangeDetail {
     if (currentPatchSetId != null) {
       currentDetail = new PatchSetDetail();
       currentDetail.load(db, getCurrentPatchSet());
+
+      final HashSet<Change.Id> changesToGet = new HashSet<Change.Id>();
+      final List<Change.Id> ancestorOrder = new ArrayList<Change.Id>();
+      for (final PatchSetAncestor a : db.patchSetAncestors().ancestorsOf(
+          currentPatchSetId).toList()) {
+        for (PatchSet p : db.patchSets().byRevision(a.getAncestorRevision())) {
+          final Change.Id ck = p.getKey().getParentKey();
+          if (changesToGet.add(ck)) {
+            ancestorOrder.add(ck);
+          }
+        }
+      }
+
+      final String cprev = getCurrentPatchSet().getRevision();
+      final List<PatchSetAncestor> descendants =
+          cprev != null ? db.patchSetAncestors().descendantsOf(cprev).toList()
+              : Collections.<PatchSetAncestor> emptyList();
+      for (final PatchSetAncestor a : descendants) {
+        changesToGet.add(a.getPatchSet().getParentKey());
+      }
+      final Map<Change.Id, Change> m =
+          db.changes().toMap(db.changes().get(changesToGet));
+
+      dependsOn = new ArrayList<ChangeInfo>();
+      for (final Change.Id a : ancestorOrder) {
+        final Change ac = m.get(a);
+        if (ac != null) {
+          dependsOn.add(new ChangeInfo(ac, acc));
+        }
+      }
+
+      neededBy = new ArrayList<ChangeInfo>();
+      for (final PatchSetAncestor a : descendants) {
+        final Change ac = m.get(a.getPatchSet().getParentKey());
+        if (ac != null) {
+          neededBy.add(new ChangeInfo(ac, acc));
+        }
+      }
+
+      Collections.sort(neededBy, new Comparator<ChangeInfo>() {
+        public int compare(final ChangeInfo o1, final ChangeInfo o2) {
+          // TODO sort neededBy by something more reasonable than Id
+          return o1.getId().get() - o2.getId().get();
+        }
+      });
     }
 
     accounts = acc.create();

webapp/src/com/google/gerrit/client/data/ChangeInfo.java

@@ -28,12 +28,14 @@ public class ChangeInfo {
   protected ChangeInfo() {
   }
 
-  public ChangeInfo(final Change c) {
+  public ChangeInfo(final Change c, final AccountInfoCacheFactory acc) {
     id = c.getKey();
     owner = c.getOwner();
     subject = c.getSubject();
     status = c.getStatus();
     project = new ProjectInfo(c.getDest().getParentKey());
+
+    acc.want(owner);
   }
 
   public Change.Id getId() {

webapp/src/com/google/gerrit/client/reviewdb/PatchSetAncestor.java

@@ -0,0 +1,78 @@
+// Copyright 2008 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.client.reviewdb;
+
+import com.google.gwtorm.client.Column;
+import com.google.gwtorm.client.IntKey;
+
+/** Ancestors of a {@link PatchSet} that the PatchSet depends upon. */
+public final class PatchSetAncestor {
+  public static class Key extends IntKey<PatchSet.Id> {
+    @Column(name = Column.NONE)
+    protected PatchSet.Id patchSetId;
+
+    @Column
+    protected int position;
+
+    protected Key() {
+      patchSetId = new PatchSet.Id();
+    }
+
+    public Key(final PatchSet.Id psId, final int pos) {
+      this.patchSetId = psId;
+      this.position = pos;
+    }
+
+    @Override
+    public PatchSet.Id getParentKey() {
+      return patchSetId;
+    }
+
+    @Override
+    public int get() {
+      return position;
+    }
+  }
+
+  @Column(name = Column.NONE)
+  protected Key key;
+
+  @Column(length = 40)
+  protected String ancestorRevision;
+
+  protected PatchSetAncestor() {
+  }
+
+  public PatchSetAncestor(final PatchSetAncestor.Key k, final String rev) {
+    key = k;
+    ancestorRevision = rev;
+  }
+
+  public PatchSetAncestor.Key getKey() {
+    return key;
+  }
+
+  public PatchSet.Id getPatchSet() {
+    return key.patchSetId;
+  }
+
+  public int getPosition() {
+    return key.position;
+  }
+
+  public String getAncestorRevision() {
+    return ancestorRevision;
+  }
+}

webapp/src/com/google/gerrit/client/reviewdb/PatchSetAncestorAccess.java

@@ -0,0 +1,34 @@
+// Copyright 2008 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.client.reviewdb;
+
+import com.google.gwtorm.client.Access;
+import com.google.gwtorm.client.OrmException;
+import com.google.gwtorm.client.PrimaryKey;
+import com.google.gwtorm.client.Query;
+import com.google.gwtorm.client.ResultSet;
+
+public interface PatchSetAncestorAccess extends
+    Access<PatchSetAncestor, PatchSetAncestor.Key> {
+  @PrimaryKey("key")
+  PatchSetAncestor get(PatchSetAncestor.Key key) throws OrmException;
+
+  @Query("WHERE key.patchSetId = ? ORDER BY key.position")
+  ResultSet<PatchSetAncestor> ancestorsOf(PatchSet.Id id) throws OrmException;
+
+  @Query("WHERE ancestorRevision = ?")
+  ResultSet<PatchSetAncestor> descendantsOf(String revision)
+      throws OrmException;
+}

webapp/src/com/google/gerrit/client/reviewdb/ReviewDb.java

@@ -77,6 +77,9 @@ public interface ReviewDb extends Schema {
   @Relation
   PatchSetInfoAccess patchSetInfo();
 
+  @Relation
+  PatchSetAncestorAccess patchSetAncestors();
+
   @Relation
   PatchAccess patches();