1 files changed, 145 insertions, 0 deletions
diff --git a/platform/dvcs-impl/src/com/intellij/dvcs/repo/RepositoryUtil.java b/platform/dvcs-impl/src/com/intellij/dvcs/repo/RepositoryUtil.java
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index 000000000000..5a5a555768ba
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+++ b/platform/dvcs-impl/src/com/intellij/dvcs/repo/RepositoryUtil.java
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2000-2013 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.repo;
+
+import com.intellij.openapi.diagnostic.Logger;
+import com.intellij.openapi.util.Condition;
+import com.intellij.openapi.util.Disposer;
+import com.intellij.openapi.util.io.FileUtil;
+import com.intellij.openapi.util.text.StringUtil;
+import com.intellij.openapi.vfs.VfsUtil;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.util.Consumer;
+import com.intellij.util.Processor;
+import com.intellij.util.containers.ContainerUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.concurrent.Callable;
+
+/**
+ * @author Nadya Zabrodina
+ */
+public class RepositoryUtil {
+
+  private static final Logger LOGGER = Logger.getInstance(RepositoryUtil.class);
+  private static final int IO_RETRIES = 3; // number of retries before fail if an IOException happens during file read.
+
+  public static void assertFileExists(File file, String message) {
+    if (!file.exists()) {
+      throw new RepoStateException(message);
+    }
+  }
+
+  /**
+   * Loads the file content.
+   * Tries 3 times, then a {@link RepoStateException} is thrown.
+   * Content is then trimmed and line separators get converted.
+   *
+   * @param file File to read.
+   * @return file content.
+   */
+  @NotNull
+  public static String tryLoadFile(@NotNull final File file) {
+    return tryOrThrow(new Callable<String>() {
+      @Override
+      public String call() throws Exception {
+        return StringUtil.convertLineSeparators(FileUtil.loadFile(file).trim());
+      }
+    }, file);
+  }
+
+  /**
+   * Tries to execute the given action.
+   * If an IOException happens, tries again up to 3 times, and then throws a {@link RepoStateException}.
+   * If an other exception happens, rethrows it as a {@link RepoStateException}.
+   * In the case of success returns the result of the task execution.
+   */
+  public static <T> T tryOrThrow(Callable<T> actionToTry, File fileToLoad) {
+    IOException cause = null;
+    for (int i = 0; i < IO_RETRIES; i++) {
+      try {
+        return actionToTry.call();
+      }
+      catch (IOException e) {
+        LOGGER.info("IOException while loading " + fileToLoad, e);
+        cause = e;
+      }
+      catch (Exception e) {    // this shouldn't happen since only IOExceptions are thrown in clients.
+        throw new RepoStateException("Couldn't load file " + fileToLoad, e);
+      }
+    }
+    throw new RepoStateException("Couldn't load file " + fileToLoad, cause);
+  }
+
+  public static void visitVcsDirVfs(@NotNull VirtualFile gitDir, @NotNull Collection<String> subDirs) {
+    gitDir.getChildren();
+    for (String subdir : subDirs) {
+      VirtualFile dir = gitDir.findFileByRelativePath(subdir);
+      // process recursively, because we need to visit all branches under refs/heads and refs/remotes
+      visitAllChildrenRecursively(dir);
+    }
+  }
+
+  public static void visitAllChildrenRecursively(@Nullable VirtualFile dir) {
+    if (dir == null) {
+      return;
+    }
+    VfsUtil.processFilesRecursively(dir, new Processor<VirtualFile>() {
+      @Override
+      public boolean process(VirtualFile virtualFile) {
+        return true;
+      }
+    });
+  }
+
+  public static class Updater implements Consumer<Object> {
+    private final Repository myRepository;
+
+    public Updater(Repository repository) {
+      myRepository = repository;
+    }
+
+    @Override
+    public void consume(Object dummy) {
+      if (!Disposer.isDisposed(myRepository)) {
+        myRepository.update();
+      }
+    }
+  }
+
+  public static <T extends Repository> List<T> sortRepositories(@NotNull Collection<T> repositories) {
+    List<T> repos = ContainerUtil.filter(repositories, new Condition<T>() {
+      @Override
+      public boolean value(T t) {
+        return t.getRoot().isValid();
+      }
+    });
+    Collections.sort(repos, new Comparator<Repository>() {
+      @Override
+      public int compare(Repository o1, Repository o2) {
+        return o1.getPresentableUrl().compareTo(o2.getPresentableUrl());
+      }
+    });
+    return repos;
+  }
+}