1 files changed, 69 insertions, 0 deletions
diff --git a/platform/dvcs-impl/src/com/intellij/dvcs/ui/VcsLogOneCommitPerRepoAction.java b/platform/dvcs-impl/src/com/intellij/dvcs/ui/VcsLogOneCommitPerRepoAction.java
new file mode 100644
index 000000000000..1b4be918a3e1
--- /dev/null
+++ b/platform/dvcs-impl/src/com/intellij/dvcs/ui/VcsLogOneCommitPerRepoAction.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * 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.intellij.dvcs.ui;
+
+import com.intellij.dvcs.repo.Repository;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.Condition;
+import com.intellij.util.containers.ContainerUtil;
+import com.intellij.util.containers.MultiMap;
+import com.intellij.vcs.log.VcsFullCommitDetails;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collection;
+import java.util.Map;
+
+public abstract class VcsLogOneCommitPerRepoAction<Repo extends Repository> extends VcsLogAction<Repo> {
+
+  @Override
+  protected void actionPerformed(@NotNull Project project, @NotNull MultiMap<Repo, VcsFullCommitDetails> grouped) {
+    Map<Repo, VcsFullCommitDetails> singleElementMap = convertToSingleElementMap(grouped);
+    assert singleElementMap != null;
+    actionPerformed(project, singleElementMap);
+  }
+
+  @Override
+  protected boolean isEnabled(@NotNull MultiMap<Repo, VcsFullCommitDetails> grouped) {
+    return allValuesAreSingletons(grouped);
+  }
+
+  protected abstract void actionPerformed(@NotNull Project project, @NotNull Map<Repo, VcsFullCommitDetails> commits);
+
+  private boolean allValuesAreSingletons(@NotNull MultiMap<Repo, VcsFullCommitDetails> grouped) {
+    return !ContainerUtil.exists(grouped.entrySet(), new Condition<Map.Entry<Repo, Collection<VcsFullCommitDetails>>>() {
+      @Override
+      public boolean value(Map.Entry<Repo, Collection<VcsFullCommitDetails>> entry) {
+        return entry.getValue().size() != 1;
+      }
+    });
+  }
+
+  @Nullable
+  private Map<Repo, VcsFullCommitDetails> convertToSingleElementMap(@NotNull MultiMap<Repo, VcsFullCommitDetails> groupedCommits) {
+    Map<Repo, VcsFullCommitDetails> map = ContainerUtil.newHashMap();
+    for (Map.Entry<Repo, Collection<VcsFullCommitDetails>> entry : groupedCommits.entrySet()) {
+      Collection<VcsFullCommitDetails> commits = entry.getValue();
+      if (commits.size() != 1) {
+        return null;
+      }
+      map.put(entry.getKey(), commits.iterator().next());
+    }
+    return map;
+  }
+
+
+}