/*
* Apache License
* Version 2.0, January 2004
* http://www.apache.org/licenses/
*
* Copyright 2013 Aurelian Tutuianu
* Copyright 2014 Aurelian Tutuianu
* Copyright 2015 Aurelian Tutuianu
* Copyright 2016 Aurelian Tutuianu
*
* Licensed 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 rapaio.experiment.mc;
import java.text.BreakIterator;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
/**
* Created by <a href="mailto:padreati@yahoo.com">Aurelian Tutuianu</a> on 12/2/15.
*/
public class WordChainAdapter implements ChainAdapter {
int n = 2;
@Override
public List<String> tokenize(String rawChain) {
List<String> words = new ArrayList<>();
BreakIterator breakIterator = BreakIterator.getWordInstance();
breakIterator.setText(rawChain);
int lastIndex = breakIterator.first();
while (BreakIterator.DONE != lastIndex) {
int firstIndex = lastIndex;
lastIndex = breakIterator.next();
if (lastIndex != BreakIterator.DONE &&
(Character.isLetterOrDigit(rawChain.charAt(firstIndex))
|| Character.isJavaIdentifierPart(rawChain.charAt(firstIndex)))) {
words.add(rawChain.substring(firstIndex, lastIndex));
}
}
words.add(".");
List<String> result = new ArrayList<>();
for (int i = n; i < words.size(); i++) {
result.add(words.subList(i - n, i).stream().collect(Collectors.joining(" ")));
}
return result;
}
@Override
public String restore(List<String> chain) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < chain.size(); i++) {
if (i == 0)
sb.append(chain.get(i));
else {
String[] tok = chain.get(i).split(" ", -1);
if (sb.length() > 0) {
sb.append(" ");
}
sb.append(tok[tok.length - 1]);
}
}
return sb.toString();
}
}