// Copyright (C) 2017 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.googlesource.gerrit.plugins.supermanifest;

import java.io.IOException;
import org.eclipse.jgit.errors.RevisionSyntaxException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Repository;

class Utils {
  public static byte[] readBlob(Repository repo, String idStr) throws IOException {
    try (ObjectReader reader = repo.newObjectReader()) {
      ObjectId id = repo.resolve(idStr);
      if (id == null) {
        throw new RevisionSyntaxException(
            String.format("repo %s does not have %s", repo.toString(), idStr), idStr);
      }
      return reader.open(id).getCachedBytes(Integer.MAX_VALUE);
    }
  }
}