org.datavec.nlp.tokenization.tokenizer.UimaTokenizer Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.datavec.nlp.tokenization.tokenizer;
import org.apache.uima.cas.CAS;
import org.apache.uima.fit.util.JCasUtil;
import org.cleartk.token.type.Token;
import org.datavec.nlp.uima.UimaResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Tokenizer based on the passed in analysis engine
* @author Adam Gibson
*
*/
public class UimaTokenizer implements Tokenizer {
private List tokens;
private int index;
private static Logger log = LoggerFactory.getLogger(UimaTokenizer.class);
private boolean checkForLabel;
private TokenPreProcess tokenPreProcessor;
public UimaTokenizer(String tokens, UimaResource resource, boolean checkForLabel) {
this.checkForLabel = checkForLabel;
this.tokens = new ArrayList<>();
try {
CAS cas = resource.process(tokens);
Collection tokenList = JCasUtil.select(cas.getJCas(), Token.class);
for (Token t : tokenList) {
if (!checkForLabel || valid(t.getCoveredText()))
if (t.getLemma() != null)
this.tokens.add(t.getLemma());
else if (t.getStem() != null)
this.tokens.add(t.getStem());
else
this.tokens.add(t.getCoveredText());
}
resource.release(cas);
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
private boolean valid(String check) {
if (check.matches("<[A-Z]+>") || check.matches(""))
return false;
return true;
}
@Override
public boolean hasMoreTokens() {
return index < tokens.size();
}
@Override
public int countTokens() {
return tokens.size();
}
@Override
public String nextToken() {
String ret = tokens.get(index);
index++;
if (tokenPreProcessor != null) {
ret = tokenPreProcessor.preProcess(ret);
}
return ret;
}
@Override
public List getTokens() {
List tokens = new ArrayList<>();
while (hasMoreTokens()) {
tokens.add(nextToken());
}
return tokens;
}
@Override
public void setTokenPreProcessor(TokenPreProcess tokenPreProcessor) {
this.tokenPreProcessor = tokenPreProcessor;
}
}