content: package edu.mit.ll.graphulo.util;
  
  import com.google.common.base.Preconditions;
  import org.apache.commons.codec.binary.Base64;
  import org.apache.hadoop.io.Writable;
  
  import java.io.ByteArrayInputStream;
  import java.io.ByteArrayOutputStream;
  import java.io.DataInputStream;
  import java.io.DataOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import java.io.OutputStream;
  import java.io.Serializable;
  //import java.util.Base64
  /**
   * Partially based from {@link org.apache.commons.lang3.SerializationUtils}.
   *
   * <p>Assists with the serialization process and performs additional functionality based
   * on serialization.</p>
   */
  public final class SerializationUtil {
  
    private SerializationUtil() {
      super();
    }
  
    public static String serializeWritableBase64(Writable writable) {
      byte[] b = serializeWritable(writable);
      //return org.apache.accumulo.core.util.Base64.encodeBase64String(b);
      return java.util.Base64.getEncoder().encodeToString(b);
    }
  
    public static void deserializeWritableBase64(Writable writable, String str) {
      byte[] b = org.apache.commons.codec.binary.Base64.decodeBase64(str);
      deserializeWritable(writable, b);
    }
  
    public static String serializeBase64(Serializable obj) {
      byte[] b = serialize(obj);
      //return org.apache.accumulo.core.util.Base64.encodeBase64String(b);
      return java.util.Base64.getEncoder().encodeToString(b);
    }
  
    public static Object deserializeBase64(String str) {
      byte[] b = Base64.decodeBase64(str);
      return deserialize(b);
    }
  
  
    // Interop with Hadoop Writable
    //-----------------------------------------------------------------------
  
    public static byte[] serializeWritable(Writable writable) {
      ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
      serializeWritable(writable, baos);
      return baos.toByteArray();
    }
  
    public static void serializeWritable(Writable obj, OutputStream outputStream) {
      Preconditions.checkNotNull(obj);
      Preconditions.checkNotNull(outputStream);
      try (DataOutputStream out = new DataOutputStream(outputStream)) {
        obj.write(out);
      } catch (IOException ex) {
        throw new RuntimeException(ex);
      }
    }
  
    public static void deserializeWritable(Writable writable, InputStream inputStream) {
      Preconditions.checkNotNull(writable);
      Preconditions.checkNotNull(inputStream);
      try (DataInputStream in = new DataInputStream(inputStream)) {
        writable.readFields(in);
      } catch (IOException ex) {
        throw new RuntimeException(ex);
      }
    }
  
    public static void deserializeWritable(Writable writable, byte[] objectData) {
      Preconditions.checkNotNull(objectData);
      deserializeWritable(writable, new ByteArrayInputStream(objectData));
    }
  
  
  
    // Serialize
    //-----------------------------------------------------------------------
  
    /**
     * <p>Serializes an {@code Object} to the specified stream.</p>
     * <p/>
     * <p>The stream will be closed once the object is written.
     * This avoids the need for a finally clause, and maybe also exception
     * handling, in the application code.</p>
     * <p/>
     * <p>The stream passed in is not buffered internally within this method.
     * This is the responsibility of your application if desired.</p>
     *
     * @param obj          the object to serialize to bytes, may be null
     * @param outputStream the stream to write to, must not be null
     * @throws IllegalArgumentException if {@code outputStream} is {@code null}
     */
    public static void serialize(Serializable obj, OutputStream outputStream) {
      Preconditions.checkNotNull(outputStream);
      try (ObjectOutputStream out = new ObjectOutputStream(outputStream)) {
        out.writeObject(obj);
      } catch (IOException ex) {
        throw new RuntimeException(ex);
      }
    }
  
    /**
     * <p>Serializes an {@code Object} to a byte array for
     * storage/serialization.</p>
     *
     * @param obj the object to serialize to bytes
     * @return a byte[] with the converted Serializable
     */
    public static byte[] serialize(Serializable obj) {
      ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
      serialize(obj, baos);
      return baos.toByteArray();
    }
  
    // Deserialize
    //-----------------------------------------------------------------------
  
    /**
     * <p>Deserializes an {@code Object} from the specified stream.</p>
     * <p/>
     * <p>The stream will be closed once the object is written. This
     * avoids the need for a finally clause, and maybe also exception
     * handling, in the application code.</p>
     * <p/>
     * <p>The stream passed in is not buffered internally within this method.
     * This is the responsibility of your application if desired.</p>
     *
     * @param inputStream the serialized object input stream, must not be null
     * @return the deserialized object
     * @throws IllegalArgumentException if {@code inputStream} is {@code null}
     */
    public static Object deserialize(InputStream inputStream) {
      Preconditions.checkNotNull(inputStream);
      try (ObjectInputStream in = new ObjectInputStream(inputStream)) {
        return in.readObject();
      } catch (ClassNotFoundException | IOException ex) {
        throw new RuntimeException(ex);
      }
    }
  
    /**
     * <p>Deserializes a single {@code Object} from an array of bytes.</p>
     *
     * @param objectData the serialized object, must not be null
     * @return the deserialized object
     * @throws IllegalArgumentException if {@code objectData} is {@code null}
     */
    public static Object deserialize(byte[] objectData) {
      Preconditions.checkNotNull(objectData);
      return deserialize(new ByteArrayInputStream(objectData));
    }
  
  }
  