opennlp.tools.ml.model.BinaryFileDataReader Maven / Gradle / Ivy
/*
* 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.tools.ml.model;
import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
/**
* A {@link DataReader} that reads files from a binary format.
*/
public class BinaryFileDataReader implements DataReader {
private final DataInputStream input;
/**
* Instantiates {@link BinaryFileDataReader} via a {@link File} and creates
* a {@link DataInputStream} for it.
* Based on whether the file's suffix contains {@code .gz},
* it detects whether the file is gzipped or not.
*
* @param f The {@link File} that references the model to be read.
*/
public BinaryFileDataReader(File f) throws IOException {
if (f.getName().endsWith(".gz")) {
input = new DataInputStream(new BufferedInputStream(
new GZIPInputStream(new BufferedInputStream(new FileInputStream(f)))));
}
else {
input = new DataInputStream(new BufferedInputStream(new FileInputStream(f)));
}
}
/**
* Instantiates {@link BinaryFileDataReader} via an {@link InputStream} and creates
* a {@link DataInputStream} for it.
*
* @param in The {@link InputStream} that references the model to be read.
*/
public BinaryFileDataReader(InputStream in) {
this(new DataInputStream(in));
}
/**
* Instantiates {@link BinaryFileDataReader} via an {@link DataInputStream}.
*
* @param in The {@link DataInputStream} that references the model to be read.
*/
public BinaryFileDataReader(DataInputStream in) {
input = in;
}
/**
* {@inheritDoc}
*/
@Override
public double readDouble() throws IOException {
return input.readDouble();
}
/**
* {@inheritDoc}
*/
@Override
public int readInt() throws IOException {
return input.readInt();
}
/**
* {@inheritDoc}
*/
@Override
public String readUTF() throws IOException {
return ModelParameterChunker.readUTF(input);
}
}