153 lines
4.6 KiB
Java
153 lines
4.6 KiB
Java
/*
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* ******************************************************************************
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* *
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* *
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* * This program and the accompanying materials are made available under the
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* * terms of the Apache License, Version 2.0 which is available at
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* * https://www.apache.org/licenses/LICENSE-2.0.
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* *
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* * See the NOTICE file distributed with this work for additional
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* * information regarding copyright ownership.
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* * Unless required by applicable law or agreed to in writing, software
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* * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* * License for the specific language governing permissions and limitations
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* * under the License.
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* *
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* * SPDX-License-Identifier: Apache-2.0
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* *****************************************************************************
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*/
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package org.deeplearning4j.text.sentenceiterator;
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import org.apache.commons.io.FileUtils;
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import org.apache.commons.io.IOUtils;
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import org.apache.commons.io.LineIterator;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.Arrays;
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import java.util.Iterator;
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import java.util.Queue;
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import java.util.zip.GZIPInputStream;
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@SuppressWarnings("unchecked")
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public class FileSentenceIterator extends BaseSentenceIterator {
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/*
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* Used as a pair for when
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* the number of sentences is not known
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*/
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protected volatile Iterator<File> fileIterator;
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protected volatile Queue<String> cache;
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protected volatile LineIterator currLineIterator;
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protected volatile File file;
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protected volatile File currentFile;
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/**
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* Takes a single file or directory
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*
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* @param preProcessor the sentence pre processor
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* @param file the file or folder to iterate over
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*/
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public FileSentenceIterator(SentencePreProcessor preProcessor, File file) {
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super(preProcessor);
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this.file = file;
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cache = new java.util.concurrent.ConcurrentLinkedDeque<>();
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if (file.isDirectory())
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fileIterator = FileUtils.iterateFiles(file, null, true);
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else
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fileIterator = Arrays.asList(file).iterator();
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}
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public FileSentenceIterator(File dir) {
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this(null, dir);
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}
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@Override
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public String nextSentence() {
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String ret = null;
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if (!cache.isEmpty()) {
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ret = cache.poll();
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if (preProcessor != null)
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ret = preProcessor.preProcess(ret);
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return ret;
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} else {
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if (currLineIterator == null || !currLineIterator.hasNext())
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nextLineIter();
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for (int i = 0; i < 100000; i++) {
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if (currLineIterator != null && currLineIterator.hasNext()) {
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String line = currLineIterator.nextLine();
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if (line != null)
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cache.add(line);
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else
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break;
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} else
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break;
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}
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if (!cache.isEmpty()) {
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ret = cache.poll();
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if (preProcessor != null)
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ret = preProcessor.preProcess(ret);
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return ret;
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}
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}
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if (!cache.isEmpty())
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ret = cache.poll();
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return ret;
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}
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private void nextLineIter() {
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if (fileIterator.hasNext()) {
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try {
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File next = fileIterator.next();
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currentFile = next;
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if (next.getAbsolutePath().endsWith(".gz")) {
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if (currLineIterator != null)
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currLineIterator.close();
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currLineIterator = IOUtils.lineIterator(
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new BufferedInputStream(new GZIPInputStream(new FileInputStream(next))), "UTF-8");
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} else {
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if (currLineIterator != null) {
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currLineIterator.close();
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}
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currLineIterator = FileUtils.lineIterator(next);
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}
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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}
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@Override
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public boolean hasNext() {
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return currLineIterator != null && currLineIterator.hasNext() || fileIterator.hasNext() || !cache.isEmpty();
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}
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@Override
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public void reset() {
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if (file.isFile())
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fileIterator = Arrays.asList(file).iterator();
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else
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fileIterator = FileUtils.iterateFiles(file, null, true);
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}
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}
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