/**
* 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.ctakes.core.cr;
/**
* The original code was copied from org.apache.uima.examples.cpe.FileSystemCollectionReader
* and modified for Mayo use.
*
* 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>
* <li><code>Extensions</code> (optional) - Name of optional configuration
* parameter that specifies the extensions of the files that the
* collection reader will read.
* </ul>
*
* TODO We may need to provide a way to specify some portion of the path of the file
* to be included in the id of the document especially if we extend to recursively
* gather files in the directory from sub directories.
*/
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
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.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.Progress;
import org.apache.uima.util.ProgressImpl;
import org.apache.ctakes.typesystem.type.structured.DocumentID;
public class FilesInDirectoryCollectionReader 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 specifies the extensions
* of the files that the collection reader will read. Values for this
* parameter should not begin with a dot <code>'.'</code>.
*/
public static final String PARAM_EXTENSIONS = "Extensions";
public static final String PARAM_RECURSE = "Recurse";
protected ArrayList<File> iv_files;
private String iv_encoding;
private String iv_language;
private static String[] iv_extensions;
protected int iv_currentIndex;
private boolean iv_recurse = false;
private String iv_rootPath = "";
/**
* @see org.apache.uima.collection.CollectionReader_ImplBase#initialize()
*/
public void initialize() throws ResourceInitializationException
{
File directory = new File((String)getConfigParameterValue(PARAM_INPUTDIR));
iv_encoding = (String)getConfigParameterValue(PARAM_ENCODING);
iv_language = (String)getConfigParameterValue(PARAM_LANGUAGE);
iv_extensions = (String[]) getConfigParameterValue(PARAM_EXTENSIONS);
iv_currentIndex = 0;
iv_recurse = false;
Boolean recurse = (Boolean) getConfigParameterValue(PARAM_RECURSE);
if(recurse != null)
iv_recurse = recurse.booleanValue();
iv_rootPath = directory.getPath();
//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 (not subdirectories) in the specified directory
iv_files = new ArrayList<File>();
if(!iv_recurse)
{
File[] files = directory.listFiles();
for (int i = 0; i < files.length; i++)
{
if (!files[i].isDirectory() && hasValidExtension(files[i]))
{
iv_files.add(files[i]);
}
}
}
else
{
try
{
collectFiles(directory, iv_files);
System.out.println("iv_files.size()="+iv_files.size());
}
catch(IOException ioe)
{
throw new ResourceInitializationException(ioe);
}
}
}
private void collectFiles(File directory, List<File> files) throws IOException
{
File[] dirFiles = directory.listFiles();
for(int i=0; i<dirFiles.length;i++)
{
if(dirFiles[i].isDirectory())
{
collectFiles(dirFiles[i], files);
}
else if(hasValidExtension(dirFiles[i]))
{
files.add(dirFiles[i]);
}
}
}
private boolean hasValidExtension(File file)
{
if(iv_extensions == null) return true;
for (int i = 0; i < iv_extensions.length; i++)
{
if(file.getName().endsWith("."+iv_extensions[i]))
{
return true;
}
}
return false;
}
/**
* @see org.apache.uima.collection.CollectionReader#hasNext()
*/
public boolean hasNext()
{
return iv_currentIndex < iv_files.size();
}
/**
* @see org.apache.uima.collection.CollectionReader#getNext(org.apache.uima.cas.CAS)
*/
public void getNext(CAS aCAS) throws IOException, CollectionException
{
JCas jcas;
InputStream fileInputStream = null;
Reader fileReader = null;
try
{
jcas = aCAS.getJCas();
//open input stream to file
File file = (File)iv_files.get(iv_currentIndex);
fileInputStream = new FileInputStream(file);
fileReader = new BufferedReader(new InputStreamReader(fileInputStream));
DocumentID documentIDAnnotation = new DocumentID(jcas);
String docID = createDocID(file);
documentIDAnnotation.setDocumentID(docID);
documentIDAnnotation.addToIndexes();
//if there's a CAS Initializer, call it
if (getCasInitializer() != null)
{
getCasInitializer().initializeCas(fileReader, aCAS);
}
else //No CAS Initializer, so read file and set document text ourselves
{
byte[] contents = new byte[(int)file.length() ];
fileInputStream.read( contents );
String text;
if (iv_encoding != null)
{
text = new String(contents, iv_encoding);
}
else
{
text = new String(contents);
}
//put document in CAS (assume CAS)
jcas.setDocumentText(text);
}
//set language if it was explicitly specified as a configuration parameter
if (iv_language != null)
{
// ((DocumentAnnotation)jcas.getDocumentAnnotationFs()).setLanguage(iv_language);
}
}
catch (CASException e)
{
throw new CollectionException(e);
}
finally
{
if (fileInputStream != null)
fileInputStream.close();
iv_currentIndex++;
}
}
private String createDocID(File file)
{
String docID = file.getPath();
if(iv_rootPath.endsWith(""+File.separator) ||
iv_rootPath.equals(""))
{
docID = docID.substring(iv_rootPath.length());
}
else
docID = docID.substring(iv_rootPath.length()+1);
return docID;
}
/**
* @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(iv_currentIndex, iv_files.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 iv_files.size();
}
}