1 files changed, 85 insertions, 0 deletions
diff --git a/platform/dvcs-impl/src/com/intellij/dvcs/ui/VcsLogAction.java b/platform/dvcs-impl/src/com/intellij/dvcs/ui/VcsLogAction.java
new file mode 100644
index 000000000000..bb7f64f9b24c
--- /dev/null
+++ b/platform/dvcs-impl/src/com/intellij/dvcs/ui/VcsLogAction.java
@@ -0,0 +1,85 @@
+/*
+ * 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.actionSystem.AnActionEvent;
+import com.intellij.openapi.actionSystem.CommonDataKeys;
+import com.intellij.openapi.project.DumbAwareAction;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.util.containers.MultiMap;
+import com.intellij.vcs.log.VcsFullCommitDetails;
+import com.intellij.vcs.log.VcsLog;
+import com.intellij.vcs.log.VcsLogDataKeys;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+public abstract class VcsLogAction<Repo extends Repository> extends DumbAwareAction {
+
+  @Override
+  public void actionPerformed(AnActionEvent e) {
+    Project project = e.getRequiredData(CommonDataKeys.PROJECT);
+    VcsLog log = e.getRequiredData(VcsLogDataKeys.VSC_LOG);
+    List<VcsFullCommitDetails> details = log.getSelectedDetails();
+    MultiMap<Repo, VcsFullCommitDetails> grouped = groupByRootWithCheck(project, details);
+    assert grouped != null;
+    actionPerformed(project, grouped);
+  }
+
+  @Override
+  public void update(AnActionEvent e) {
+    Project project = e.getProject();
+    VcsLog log = e.getData(VcsLogDataKeys.VSC_LOG);
+    if (project == null || log == null) {
+      e.getPresentation().setEnabledAndVisible(false);
+      return;
+    }
+
+    List<VcsFullCommitDetails> details = log.getSelectedDetails();
+    MultiMap<Repo, VcsFullCommitDetails> grouped = groupByRootWithCheck(project, details);
+    if (grouped == null) {
+      e.getPresentation().setEnabledAndVisible(false);
+    }
+    else {
+      e.getPresentation().setVisible(true);
+      e.getPresentation().setEnabled(!grouped.isEmpty() && isEnabled(grouped));
+    }
+  }
+
+  protected abstract void actionPerformed(@NotNull Project project, @NotNull MultiMap<Repo, VcsFullCommitDetails> grouped);
+
+  protected abstract boolean isEnabled(@NotNull MultiMap<Repo, VcsFullCommitDetails> grouped);
+
+  @Nullable
+  protected abstract Repo getRepositoryForRoot(@NotNull Project project, @NotNull VirtualFile root);
+
+  @Nullable
+  private MultiMap<Repo, VcsFullCommitDetails> groupByRootWithCheck(@NotNull Project project, @NotNull List<VcsFullCommitDetails> commits) {
+    MultiMap<Repo, VcsFullCommitDetails> map = MultiMap.create();
+    for (VcsFullCommitDetails commit : commits) {
+      Repo root = getRepositoryForRoot(project, commit.getRoot());
+      if (root == null) { // commit from some other VCS
+        return null;
+      }
+      map.putValue(root, commit);
+    }
+    return map;
+  }
+
+}