opennlp.tools.util.PlainTextByLineStream.java Source code

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Here is the source code for opennlp.tools.util.PlainTextByLineStream.java

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/*
 * 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.charset.Charset;
import java.util.Objects;

/**
 * Reads a plain text file and return each line as a <code>String</code> object.
 */
public class PlainTextByLineStream implements ObjectStream<String> {

    private final Charset 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 = Objects.requireNonNull(inputStreamFactory,
                "inputStreamFactory must not be null!");
        this.encoding = charset;

        reset();
    }

    public String read() throws IOException {
        return in.readLine();
    }

    public void reset() throws IOException {

        in = new BufferedReader(new InputStreamReader(inputStreamFactory.createInputStream(), encoding));
    }

    public void close() throws IOException {
        if (in != null) {
            in.close();
        }
    }
}