opennlp.tools.langdetect.LanguageDetectorSampleStream 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.langdetect;
import java.io.IOException;
import opennlp.tools.util.FilterObjectStream;
import opennlp.tools.util.ObjectStream;
/**
* This class reads in string encoded {@link ObjectStream training samples}, parses them
* and outputs {@link LanguageSample} objects.
*
* Format:
* Each line contains one sample document.
* The language is the first string in the line followed by a tab and the document content.
* Sample line: category-string tab-char document line-break-char(s)
*/
public class LanguageDetectorSampleStream
extends FilterObjectStream {
/**
* Initializes a {@link LanguageDetectorSampleStream instance}.
*
* @param samples A plain text {@link ObjectStream line stream}.
*/
public LanguageDetectorSampleStream(ObjectStream samples) {
super(samples);
}
@Override
public LanguageSample read() throws IOException {
String sampleString;
while ((sampleString = samples.read()) != null) {
int tabIndex = sampleString.indexOf("\t");
if (tabIndex > 0) {
String lang = sampleString.substring(0, tabIndex);
String context = sampleString.substring(tabIndex + 1);
return new LanguageSample(new Language(lang), context);
}
}
return null;
}
}