/*
* 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;
/*
*******************************************************************************************
* N O T E : The XML format (XCAS) that this Cas Consumer outputs, is eventually
* being superceeded by the more standardized and compact XMI format. However
* it is used currently as the expected form for remote services, and there is
* existing tooling for doing stand-alone component development and debugging
* that uses this format to populate an initial CAS. So it is not
* deprecated yet; it is also being kept for compatibility with older versions.
*
* New code should consider using the XmiWriterCasConsumer where possible,
* which uses the current XMI format for XML externalizations of the CAS
*******************************************************************************************
*/
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.uima.cas.CAS;
import org.apache.uima.cas.CASException;
import org.apache.uima.cas.FSIterator;
import org.apache.uima.cas.impl.XCASSerializer;
import org.apache.uima.collection.CasConsumer_ImplBase;
import org.apache.uima.examples.SourceDocumentInformation;
import org.apache.uima.jcas.JCas;
import org.apache.uima.resource.ResourceInitializationException;
import org.apache.uima.resource.ResourceProcessException;
import org.apache.uima.util.XMLSerializer;
import org.xml.sax.SAXException;
/**
* A simple CAS consumer that generates XCAS (XML representation of the CAS) files in the
* filesystem.
* <p>
* This CAS Consumer takes one parameters:
* <ul>
* <li><code>OutputDirectory</code> - path to directory into which output files will be written</li>
* </ul>
*
*
*/
public class XCasWriterCasConsumer extends CasConsumer_ImplBase {
/**
* Name of configuration parameter that must be set to the path of a directory into which the
* output files will be written.
*/
public static final String PARAM_OUTPUTDIR = "OutputDirectory";
private File mOutputDir;
private int mDocNum;
public void initialize() throws ResourceInitializationException {
mDocNum = 0;
mOutputDir = new File((String) getConfigParameterValue(PARAM_OUTPUTDIR));
if (!mOutputDir.exists()) {
mOutputDir.mkdirs();
}
}
/**
* Processes the CasContainer which was populated by the TextAnalysisEngines. <br>
* In this case, the CAS is converted to XML and written into the output file .
*
* @param aCAS
* CasContainer which has been populated by the TAEs
*
* @throws ResourceProcessException
* if there is an error in processing the Resource
*
* @see org.apache.uima.collection.base_cpm.CasObjectProcessor#processCas(org.apache.uima.cas.CAS)
*/
public void processCas(CAS aCAS) throws ResourceProcessException {
JCas jcas;
try {
jcas = aCAS.getJCas();
} catch (CASException e) {
throw new ResourceProcessException(e);
}
// retreive the filename of the input file from the CAS
FSIterator it = jcas.getAnnotationIndex(SourceDocumentInformation.type).iterator();
File outFile = null;
if (it.hasNext()) {
SourceDocumentInformation fileLoc = (SourceDocumentInformation) it.next();
File inFile;
try {
inFile = new File(new URL(fileLoc.getUri()).getPath());
String outFileName = inFile.getName();
if (fileLoc.getOffsetInSource() > 0) {
outFileName += fileLoc.getOffsetInSource();
}
outFile = new File(mOutputDir, outFileName);
} catch (MalformedURLException e1) {
// invalid URL, use default processing below
}
}
if (outFile == null) {
outFile = new File(mOutputDir, "doc" + mDocNum++);
}
// serialize XCAS and write to output file
try {
writeXCas(jcas.getCas(), outFile);
} catch (IOException e) {
throw new ResourceProcessException(e);
} catch (SAXException e) {
throw new ResourceProcessException(e);
}
}
/**
* Serialize a CAS to a file in XCAS format
*
* @param aCas
* CAS to serialize
* @param name
* output file
*
* @throws IOException
* if an I/O failure occurs
* @throws SAXException
* if an error occurs generating the XML text
*/
private void writeXCas(CAS aCas, File name) throws IOException, SAXException {
FileOutputStream out = null;
try {
out = new FileOutputStream(name);
XCASSerializer ser = new XCASSerializer(aCas.getTypeSystem());
XMLSerializer xmlSer = new XMLSerializer(out, false);
ser.serialize(aCas, xmlSer.getContentHandler());
} finally {
if (out != null) {
out.close();
}
}
}
}