org.deeplearning4j.text.documentiterator.FileDocumentIterator 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.deeplearning4j.text.documentiterator;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.LineIterator;
import org.nd4j.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;
/**
* Iterate over files
* @author Adam Gibson
*
*/
public class FileDocumentIterator implements DocumentIterator {
private Iterator iter;
private LineIterator lineIterator;
private File rootDir;
private static final Logger log = LoggerFactory.getLogger(FileDocumentIterator.class);
public FileDocumentIterator(String path) {
this(new File(path));
}
public FileDocumentIterator(File path) {
if (path.isFile()) {
Preconditions.checkState(path.exists(), "File %s does not exist", path);
Preconditions.checkState(path.length() > 0, "Cannot iterate over empty file: %s", path);
iter = Collections.singletonList(path).iterator();
try {
lineIterator = FileUtils.lineIterator(iter.next());
} catch (IOException e) {
throw new RuntimeException(e);
}
this.rootDir = path;
} else {
Collection fileList = FileUtils.listFiles(path, null, true);
List nonEmpty = new ArrayList<>();
for(File f : fileList){
if(f.length() > 0){
nonEmpty.add(f);
}
}
Preconditions.checkState(!nonEmpty.isEmpty(), "No (non-empty) files were found at path %s", path);
iter = nonEmpty.iterator();
try {
lineIterator = FileUtils.lineIterator(iter.next());
} catch (IOException e) {
throw new RuntimeException(e);
}
this.rootDir = path;
}
}
@Override
public synchronized InputStream nextDocument() {
try {
if (lineIterator != null && !lineIterator.hasNext() && iter.hasNext()) {
File next = iter.next();
lineIterator.close();
lineIterator = FileUtils.lineIterator(next);
while (!lineIterator.hasNext()) {
lineIterator.close();
lineIterator = FileUtils.lineIterator(next);
}
}
if (lineIterator != null && lineIterator.hasNext()) {
return new BufferedInputStream(IOUtils.toInputStream(lineIterator.nextLine()));
}
} catch (Exception e) {
log.warn("Error reading input stream...this is just a warning..Going to return", e);
return null;
}
return null;
}
@Override
public synchronized boolean hasNext() {
return iter.hasNext() || lineIterator != null && lineIterator.hasNext();
}
@Override
public void reset() {
if (rootDir.isDirectory())
iter = FileUtils.iterateFiles(rootDir, null, true);
else
iter = Arrays.asList(rootDir).iterator();
}
}