/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.uima.examples.cpe;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.uima.cas.CAS;
import org.apache.uima.cas.CASException;
import org.apache.uima.collection.CollectionException;
import org.apache.uima.collection.CollectionReader_ImplBase;
import org.apache.uima.examples.SourceDocumentInformation;
import org.apache.uima.jcas.JCas;
import org.apache.uima.jcas.tcas.DocumentAnnotation;
import org.apache.uima.resource.ResourceConfigurationException;
import org.apache.uima.resource.ResourceInitializationException;
import org.apache.uima.util.FileUtils;
import org.apache.uima.util.Progress;
import org.apache.uima.util.ProgressImpl;
/**
* A simple collection reader that reads documents from a directory in the filesystem. It can be
* configured with the following parameters:
* <ul>
* <li><code>InputDirectory</code> - path to directory containing files</li>
* <li><code>Encoding</code> (optional) - character encoding of the input files</li>
* <li><code>Language</code> (optional) - language of the input documents</li>
* </ul>
*
*
*/
public class FileSystemCollectionReader extends CollectionReader_ImplBase {
/**
* Name of configuration parameter that must be set to the path of a directory containing input
* files.
*/
public static final String PARAM_INPUTDIR = "InputDirectory";
/**
* Name of configuration parameter that contains the character encoding used by the input files.
* If not specified, the default system encoding will be used.
*/
public static final String PARAM_ENCODING = "Encoding";
/**
* Name of optional configuration parameter that contains the language of the documents in the
* input directory. If specified this information will be added to the CAS.
*/
public static final String PARAM_LANGUAGE = "Language";
/**
* Name of optional configuration parameter that indicates including
* the subdirectories (recursively) of the current input directory.
*/
public static final String PARAM_SUBDIR = "BrowseSubdirectories";
private ArrayList<File> mFiles;
private String mEncoding;
private String mLanguage;
private Boolean mRecursive;
private int mCurrentIndex;
/**
* @see org.apache.uima.collection.CollectionReader_ImplBase#initialize()
*/
public void initialize() throws ResourceInitializationException {
File directory = new File(((String) getConfigParameterValue(PARAM_INPUTDIR)).trim());
mEncoding = (String) getConfigParameterValue(PARAM_ENCODING);
mLanguage = (String) getConfigParameterValue(PARAM_LANGUAGE);
mRecursive = (Boolean) getConfigParameterValue(PARAM_SUBDIR);
if (null == mRecursive) { // could be null if not set, it is optional
mRecursive = Boolean.FALSE;
}
mCurrentIndex = 0;
// if input directory does not exist or is not a directory, throw exception
if (!directory.exists() || !directory.isDirectory()) {
throw new ResourceInitializationException(ResourceConfigurationException.DIRECTORY_NOT_FOUND,
new Object[] { PARAM_INPUTDIR, this.getMetaData().getName(), directory.getPath() });
}
// get list of files in the specified directory, and subdirectories if the
// parameter PARAM_SUBDIR is set to True
mFiles = new ArrayList<File>();
addFilesFromDir(directory);
}
/**
* This method adds files in the directory passed in as a parameter to mFiles.
* If mRecursive is true, it will include all files in all
* subdirectories (recursively), as well.
*
* @param dir
*/
private void addFilesFromDir(File dir) {
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
if (!files[i].isDirectory()) {
mFiles.add(files[i]);
} else if (mRecursive) {
addFilesFromDir(files[i]);
}
}
}
/**
* @see org.apache.uima.collection.CollectionReader#hasNext()
*/
public boolean hasNext() {
return mCurrentIndex < mFiles.size();
}
/**
* @see org.apache.uima.collection.CollectionReader#getNext(org.apache.uima.cas.CAS)
*/
public void getNext(CAS aCAS) throws IOException, CollectionException {
JCas jcas;
try {
jcas = aCAS.getJCas();
} catch (CASException e) {
throw new CollectionException(e);
}
// open input stream to file
File file = (File) mFiles.get(mCurrentIndex++);
String text = FileUtils.file2String(file, mEncoding);
// put document in CAS
jcas.setDocumentText(text);
// set language if it was explicitly specified as a configuration parameter
if (mLanguage != null) {
((DocumentAnnotation) jcas.getDocumentAnnotationFs()).setLanguage(mLanguage);
}
// Also store location of source document in CAS. This information is critical
// if CAS Consumers will need to know where the original document contents are located.
// For example, the Semantic Search CAS Indexer writes this information into the
// search index that it creates, which allows applications that use the search index to
// locate the documents that satisfy their semantic queries.
SourceDocumentInformation srcDocInfo = new SourceDocumentInformation(jcas);
srcDocInfo.setUri(file.getAbsoluteFile().toURL().toString());
srcDocInfo.setOffsetInSource(0);
srcDocInfo.setDocumentSize((int) file.length());
srcDocInfo.setLastSegment(mCurrentIndex == mFiles.size());
srcDocInfo.addToIndexes();
}
/**
* @see org.apache.uima.collection.base_cpm.BaseCollectionReader#close()
*/
public void close() throws IOException {
}
/**
* @see org.apache.uima.collection.base_cpm.BaseCollectionReader#getProgress()
*/
public Progress[] getProgress() {
return new Progress[] { new ProgressImpl(mCurrentIndex, mFiles.size(), Progress.ENTITIES) };
}
/**
* Gets the total number of documents that will be returned by this collection reader. This is not
* part of the general collection reader interface.
*
* @return the number of documents in the collection
*/
public int getNumberOfDocuments() {
return mFiles.size();
}
}