opennlp.tools.util.PlainTextByLineStream 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.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
/**
* Reads a plain text file and return each line as a String object.
*/
public class PlainTextByLineStream implements ObjectStream {
private final FileChannel channel;
private final String encoding;
private InputStreamFactory inputStreamFactory;
private BufferedReader in;
public PlainTextByLineStream(InputStreamFactory inputStreamFactory,
String charsetName) throws IOException {
this(inputStreamFactory, Charset.forName(charsetName));
}
public PlainTextByLineStream(InputStreamFactory inputStreamFactory,
Charset charset) throws IOException {
this.inputStreamFactory = inputStreamFactory;
this.channel = null;
this.encoding = charset.name();
reset();
}
public String read() throws IOException {
return in.readLine();
}
public void reset() throws IOException {
if (inputStreamFactory != null) {
in = new BufferedReader(new InputStreamReader(inputStreamFactory.createInputStream(),
encoding));
} else if (channel == null) {
in.reset();
} else {
channel.position(0);
in = new BufferedReader(Channels.newReader(channel, encoding));
}
}
public void close() throws IOException {
if (in != null && channel == null) {
in.close();
} else if (channel != null) {
channel.close();
}
}
}