1 files changed, 123 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/submit/ChangeSet.java b/java/com/google/gerrit/server/submit/ChangeSet.java
new file mode 100644
index 0000000000..8c94a21534
--- /dev/null
+++ b/java/com/google/gerrit/server/submit/ChangeSet.java
@@ -0,0 +1,123 @@
+// Copyright (C) 2015 The Android Open Source Project
+//
+// 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.server.submit;
+
+import com.google.common.collect.ImmutableCollection;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.ListMultimap;
+import com.google.common.collect.MultimapBuilder;
+import com.google.gerrit.reviewdb.client.Branch;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.server.query.change.ChangeData;
+import com.google.gwtorm.server.OrmException;
+import java.util.Collection;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * A set of changes grouped together to be submitted atomically.
+ *
+ * <p>MergeSuperSet constructs ChangeSets to accumulate intermediate results toward the ChangeSet it
+ * returns when done.
+ *
+ * <p>This class is not thread safe.
+ */
+public class ChangeSet {
+  private final ImmutableMap<Change.Id, ChangeData> changeData;
+
+  /**
+   * Additional changes not included in changeData because their connection to the original change
+   * is not visible to the current user. That is, this map includes both - changes that are not
+   * visible to the current user, and - changes whose only relationship to the set is via a change
+   * that is not visible to the current user
+   */
+  private final ImmutableMap<Change.Id, ChangeData> nonVisibleChanges;
+
+  private static ImmutableMap<Change.Id, ChangeData> index(
+      Iterable<ChangeData> changes, Collection<Change.Id> exclude) {
+    Map<Change.Id, ChangeData> ret = new LinkedHashMap<>();
+    for (ChangeData cd : changes) {
+      Change.Id id = cd.getId();
+      if (!ret.containsKey(id) && !exclude.contains(id)) {
+        ret.put(id, cd);
+      }
+    }
+    return ImmutableMap.copyOf(ret);
+  }
+
+  public ChangeSet(Iterable<ChangeData> changes, Iterable<ChangeData> hiddenChanges) {
+    changeData = index(changes, ImmutableList.<Change.Id>of());
+    nonVisibleChanges = index(hiddenChanges, changeData.keySet());
+  }
+
+  public ChangeSet(ChangeData change, boolean visible) {
+    this(
+        visible ? ImmutableList.of(change) : ImmutableList.<ChangeData>of(),
+        ImmutableList.of(change));
+  }
+
+  public ImmutableSet<Change.Id> ids() {
+    return changeData.keySet();
+  }
+
+  public ImmutableMap<Change.Id, ChangeData> changesById() {
+    return changeData;
+  }
+
+  public ListMultimap<Branch.NameKey, ChangeData> changesByBranch() throws OrmException {
+    ListMultimap<Branch.NameKey, ChangeData> ret =
+        MultimapBuilder.hashKeys().arrayListValues().build();
+    for (ChangeData cd : changeData.values()) {
+      ret.put(cd.change().getDest(), cd);
+    }
+    return ret;
+  }
+
+  public ImmutableCollection<ChangeData> changes() {
+    return changeData.values();
+  }
+
+  public ImmutableSet<Project.NameKey> projects() {
+    ImmutableSet.Builder<Project.NameKey> ret = ImmutableSet.builder();
+    for (ChangeData cd : changeData.values()) {
+      ret.add(cd.project());
+    }
+    return ret.build();
+  }
+
+  public ImmutableSet<Change.Id> nonVisibleIds() {
+    return nonVisibleChanges.keySet();
+  }
+
+  public ImmutableList<ChangeData> nonVisibleChanges() {
+    return nonVisibleChanges.values().asList();
+  }
+
+  public boolean furtherHiddenChanges() {
+    return !nonVisibleChanges.isEmpty();
+  }
+
+  public int size() {
+    return changeData.size() + nonVisibleChanges.size();
+  }
+
+  @Override
+  public String toString() {
+    return getClass().getSimpleName() + ids() + nonVisibleIds();
+  }
+}