/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 opennlp.addons.mallet;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;

import cc.mallet.classify.Classifier;
import opennlp.tools.util.InvalidFormatException;
import opennlp.tools.util.model.ArtifactSerializer;

// The standard method for saving classifiers in Mallet is through Java serialization.

public class ClassifierModelSerializer implements
    ArtifactSerializer<ClassifierModel> {

  @Override
  public ClassifierModel create(InputStream in) throws IOException,
      InvalidFormatException {

    ObjectInputStream ois = new ObjectInputStream(in);
    try {
      Classifier classifier = (Classifier) ois.readObject();
      return new ClassifierModel(classifier);
    } catch (ClassNotFoundException e) {
      throw new IOException(e);
    }
  }

  @Override
  public void serialize(ClassifierModel artifact, OutputStream out)
      throws IOException {
    ObjectOutputStream oos = new ObjectOutputStream(out);
    oos.writeObject(artifact.getClassifer());
    oos.flush();
  }
}