1 files changed, 139 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/project/ProjectLevelConfig.java b/java/com/google/gerrit/server/project/ProjectLevelConfig.java
new file mode 100644
index 0000000000..961d1fcaf6
--- /dev/null
+++ b/java/com/google/gerrit/server/project/ProjectLevelConfig.java
@@ -0,0 +1,139 @@
+// Copyright (C) 2013 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.project;
+
+import static java.util.stream.Collectors.toList;
+
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Streams;
+import com.google.gerrit.reviewdb.client.RefNames;
+import com.google.gerrit.server.git.meta.VersionedMetaData;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Stream;
+import org.eclipse.jgit.errors.ConfigInvalidException;
+import org.eclipse.jgit.lib.CommitBuilder;
+import org.eclipse.jgit.lib.Config;
+
+/** Configuration file in the projects refs/meta/config branch. */
+public class ProjectLevelConfig extends VersionedMetaData {
+  private final String fileName;
+  private final ProjectState project;
+  private Config cfg;
+
+  public ProjectLevelConfig(String fileName, ProjectState project) {
+    this.fileName = fileName;
+    this.project = project;
+  }
+
+  @Override
+  protected String getRefName() {
+    return RefNames.REFS_CONFIG;
+  }
+
+  @Override
+  protected void onLoad() throws IOException, ConfigInvalidException {
+    cfg = readConfig(fileName);
+  }
+
+  public Config get() {
+    if (cfg == null) {
+      cfg = new Config();
+    }
+    return cfg;
+  }
+
+  public Config getWithInheritance() {
+    return getWithInheritance(false);
+  }
+
+  /**
+   * Get a Config that includes the values from all parent projects.
+   *
+   * <p>Merging means that matching sections/subsection will be merged to include the values from
+   * both parent and child config.
+   *
+   * <p>No merging means that matching sections/subsections in the child project will replace the
+   * corresponding value from the parent.
+   *
+   * @param merge whether to merge parent values with child values or not.
+   * @return a combined config.
+   */
+  public Config getWithInheritance(boolean merge) {
+    Config cfgWithInheritance = new Config();
+    try {
+      cfgWithInheritance.fromText(get().toText());
+    } catch (ConfigInvalidException e) {
+      // cannot happen
+    }
+    ProjectState parent = Iterables.getFirst(project.parents(), null);
+    if (parent != null) {
+      Config parentCfg = parent.getConfig(fileName).getWithInheritance();
+      for (String section : parentCfg.getSections()) {
+        Set<String> allNames = get().getNames(section);
+        for (String name : parentCfg.getNames(section)) {
+          String[] parentValues = parentCfg.getStringList(section, null, name);
+          if (!allNames.contains(name)) {
+            cfgWithInheritance.setStringList(section, null, name, Arrays.asList(parentValues));
+          } else if (merge) {
+            cfgWithInheritance.setStringList(
+                section,
+                null,
+                name,
+                Stream.concat(
+                        Arrays.stream(cfg.getStringList(section, null, name)),
+                        Arrays.stream(parentValues))
+                    .sorted()
+                    .distinct()
+                    .collect(toList()));
+          }
+        }
+
+        for (String subsection : parentCfg.getSubsections(section)) {
+          allNames = get().getNames(section, subsection);
+          for (String name : parentCfg.getNames(section, subsection)) {
+            String[] parentValues = parentCfg.getStringList(section, subsection, name);
+            if (!allNames.contains(name)) {
+              cfgWithInheritance.setStringList(
+                  section, subsection, name, Arrays.asList(parentValues));
+            } else if (merge) {
+              cfgWithInheritance.setStringList(
+                  section,
+                  subsection,
+                  name,
+                  Streams.concat(
+                          Arrays.stream(cfg.getStringList(section, subsection, name)),
+                          Arrays.stream(parentValues))
+                      .sorted()
+                      .distinct()
+                      .collect(toList()));
+            }
+          }
+        }
+      }
+    }
+    return cfgWithInheritance;
+  }
+
+  @Override
+  protected boolean onSave(CommitBuilder commit) throws IOException, ConfigInvalidException {
+    if (commit.getMessage() == null || "".equals(commit.getMessage())) {
+      commit.setMessage("Updated configuration\n");
+    }
+    saveConfig(fileName, cfg);
+    return true;
+  }
+}