org.datavec.nlp.tokenization.tokenizer.DefaultStreamTokenizer 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 java.io.*;
import java.util.ArrayList;
import java.util.List;
/**
* Tokenizer based on the {@link java.io.StreamTokenizer}
* @author Adam Gibson
*
*/
public class DefaultStreamTokenizer implements Tokenizer {
private StreamTokenizer streamTokenizer;
private TokenPreProcess tokenPreProcess;
public DefaultStreamTokenizer(InputStream is) {
Reader r = new BufferedReader(new InputStreamReader(is));
streamTokenizer = new StreamTokenizer(r);
}
@Override
public boolean hasMoreTokens() {
if (streamTokenizer.ttype != StreamTokenizer.TT_EOF) {
try {
streamTokenizer.nextToken();
} catch (IOException e1) {
throw new RuntimeException(e1);
}
}
return streamTokenizer.ttype != StreamTokenizer.TT_EOF && streamTokenizer.ttype != -1;
}
@Override
public int countTokens() {
return getTokens().size();
}
@Override
public String nextToken() {
StringBuilder sb = new StringBuilder();
if (streamTokenizer.ttype == StreamTokenizer.TT_WORD) {
sb.append(streamTokenizer.sval);
} else if (streamTokenizer.ttype == StreamTokenizer.TT_NUMBER) {
sb.append(streamTokenizer.nval);
} else if (streamTokenizer.ttype == StreamTokenizer.TT_EOL) {
try {
while (streamTokenizer.ttype == StreamTokenizer.TT_EOL)
streamTokenizer.nextToken();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
else if (hasMoreTokens())
return nextToken();
String ret = sb.toString();
if (tokenPreProcess != null)
ret = tokenPreProcess.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.tokenPreProcess = tokenPreProcessor;
}
}