opennlp-ml/src/main/java/org/apache/opennlp/ml/perceptron/PlainTextPerceptronModelWriter.java

/*
 * 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 org.apache.opennlp.ml.perceptron;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.zip.GZIPOutputStream;

import org.apache.opennlp.ml.model.AbstractModel;

/**
 * Model writer that saves models in plain text format.
 */
public class PlainTextPerceptronModelWriter extends PerceptronModelWriter {
  BufferedWriter output;

  /**
   * Constructor which takes a PerceptronModel and a File and prepares itself to
   * write the model to that file. Detects whether the file is gzipped or not
   * based on whether the suffix contains ".gz".
   *
   * @param model The PerceptronModel which is to be persisted.
   * @param f The File in which the model is to be persisted.
   */
  public PlainTextPerceptronModelWriter (AbstractModel model, File f)
  throws IOException, FileNotFoundException {

    super(model);
    if (f.getName().endsWith(".gz")) {
      output = new BufferedWriter(new OutputStreamWriter(
          new GZIPOutputStream(new FileOutputStream(f))));
    }
    else {
      output = new BufferedWriter(new FileWriter(f));
    }
  }

  /**
   * Constructor which takes a PerceptronModel and a BufferedWriter and prepares
   * itself to write the model to that writer.
   *
   * @param model The PerceptronModel which is to be persisted.
   * @param bw The BufferedWriter which will be used to persist the model.
   */
  public PlainTextPerceptronModelWriter (AbstractModel model, BufferedWriter bw) {
    super(model);
    output = bw;
  }

  public void writeUTF (String s) throws java.io.IOException {
    output.write(s);
    output.newLine();
  }

  public void writeInt (int i) throws java.io.IOException {
    output.write(Integer.toString(i));
    output.newLine();
  }

  public void writeDouble (double d) throws java.io.IOException {
    output.write(Double.toString(d));
    output.newLine();
  }

  public void close () throws java.io.IOException {
    output.flush();
    output.close();
  }

}