001/*
002 * SonarQube, open source software quality management tool.
003 * Copyright (C) 2008-2014 SonarSource
004 * mailto:contact AT sonarsource DOT com
005 *
006 * SonarQube is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 3 of the License, or (at your option) any later version.
010 *
011 * SonarQube is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014 * Lesser General Public License for more details.
015 *
016 * You should have received a copy of the GNU Lesser General Public License
017 * along with this program; if not, write to the Free Software Foundation,
018 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
019 */
020package org.sonar.batch.protocol;
021
022import com.google.protobuf.Message;
023import com.google.protobuf.Parser;
024
025import java.io.BufferedInputStream;
026import java.io.BufferedOutputStream;
027import java.io.File;
028import java.io.FileInputStream;
029import java.io.FileOutputStream;
030import java.io.IOException;
031import java.io.InputStream;
032import java.io.OutputStream;
033
034public class ProtobufUtil {
035  private ProtobufUtil() {
036    // only static stuff
037  }
038
039  public static <T extends Message> T readFile(File file, Parser<T> parser) {
040    try (InputStream input = new BufferedInputStream(new FileInputStream(file))) {
041      return parser.parseFrom(input);
042    } catch (IOException e) {
043      throw new IllegalStateException("Failed to read file: " + file, e);
044    }
045  }
046
047  public static void writeToFile(Message message, File toFile) {
048    try (OutputStream out = new BufferedOutputStream(new FileOutputStream(toFile, false))) {
049      message.writeTo(out);
050    } catch (IOException e) {
051      throw new IllegalStateException("Unable to write protocol buffer data to file " + toFile, e);
052    }
053  }
054}