FileUtils.java

package se.kodapan.osm.sweden;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;

/**
 * @author kalle
 * @since 2012-03-06 01:18
 */
public class FileUtils {

  private static Logger log = LoggerFactory.getLogger(FileUtils.class);

  /**
   * @param path
   * @throws IOException if path not exists and could not be created.
   */
  public static File mkdirs(File path) throws IOException {
    path = getCleanAbsolutePath(path);
    // todo find parents and throw exception if the first existing is not a directory
    if (!path.exists()) {
      if (!path.mkdirs()) {
        throw new IOException("Could not mkdirs " + path.getAbsolutePath());
      }
//      log.info("Created directory " + path.getAbsolutePath());
    }
    return path;
  }

  /**
   * Makes "/tmp/a/b/c/./../.." into "/tmp/a/b/c"
   *
   * @param path
   * @return
   * @throws IOException
   */
  public static File getCleanAbsolutePath(File path) throws IOException {
    path = new File(path.getAbsolutePath());
    while (path.isDirectory()) {
      if (".".equals(path.getName())) {
        path = path.getParentFile();
      } else if ("..".equals(path.getName())) {
        path = path.getParentFile();
      } else {
        break;
      }
    }
    return path;
  }

  public static Serializable loadSerializable(File file) throws Exception {
    log.info("Loading " + getCleanAbsolutePath(file).getAbsolutePath());
    Serializable serializable;
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream(file));
    try {
      serializable = (Serializable) ois.readObject();
    } finally {
      ois.close();
    }
    return serializable;
  }

  public static void saveSerializable(Serializable serializable, File file) throws Exception {
    log.info("Saving " + getCleanAbsolutePath(file).getAbsolutePath());
    ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file));
    try {
      oos.writeObject(serializable);
    } finally {
      oos.close();
    }
  }
}