opennlp.tools.tokenize.WhitespaceTokenizer 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.tokenize;
import java.util.ArrayList;
import java.util.List;
import opennlp.tools.util.Span;
import opennlp.tools.util.StringUtil;
/**
* This tokenizer uses white spaces to tokenize the input text.
*
* To obtain an instance of this tokenizer use the static final
* INSTANCE field.
*/
public class WhitespaceTokenizer extends AbstractTokenizer {
/**
* Use this static reference to retrieve an instance of the
* {@link WhitespaceTokenizer}.
*/
public static final WhitespaceTokenizer INSTANCE = new WhitespaceTokenizer();
/**
* Use the {@link WhitespaceTokenizer#INSTANCE} field to retrieve an instance.
*/
private WhitespaceTokenizer() {
}
public Span[] tokenizePos(String d) {
int tokStart = -1;
List tokens = new ArrayList<>();
boolean inTok = false;
//gather up potential tokens
int end = d.length();
for (int i = 0; i < end; i++) {
if (StringUtil.isWhitespace(d.charAt(i))) {
if (inTok) {
tokens.add(new Span(tokStart, i));
inTok = false;
tokStart = -1;
}
}
else {
if (!inTok) {
tokStart = i;
inTok = true;
}
}
}
if (inTok) {
tokens.add(new Span(tokStart, end));
}
return tokens.toArray(new Span[tokens.size()]);
}
}