/
PairReader_ImplBase.java
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/
PairReader_ImplBase.java
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/*******************************************************************************
* Copyright 2019
* Ubiquitous Knowledge Processing (UKP) Lab
* Technische Universität Darmstadt
*
* Licensed 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.dkpro.tc.core.io;
import java.io.IOException;
import org.apache.uima.cas.CASException;
import org.apache.uima.collection.CollectionException;
import org.apache.uima.fit.component.JCasCollectionReader_ImplBase;
import org.apache.uima.jcas.JCas;
import de.tudarmstadt.ukp.dkpro.core.api.metadata.type.DocumentMetaData;
import org.dkpro.tc.api.exception.TextClassificationException;
import org.dkpro.tc.api.type.TextClassificationTarget;
import org.dkpro.tc.core.Constants;
/**
* Abstract base class for readers used in pair-classification. We assume pair classification
* consists of two texts with one or more outcomes for the pair.
* <p>
* The <code>jcas</code> representing the instance contains two <code>views</code>. Each text in the
* pair of texts is set to one of the <code>views</code>. Information about the instance, such as
* <code>title</code> and <code>instance id</code>, is set to the original <code>jcas</code>.
*
*/
public abstract class PairReader_ImplBase
extends JCasCollectionReader_ImplBase
implements Constants, PairReader
{
@Override
public void getNext(JCas jcas) throws IOException, CollectionException
{
try {
createMetaData(jcas, getCollectionId1() + "_" + getCollectionId2(),
getDocumentId1() + "_" + getDocumentId2(), getTitle1() + " " + getTitle2());
createView(PART_ONE, jcas, getLanguage1(), getText1(), getDocumentId1(), getTitle1());
createView(PART_TWO, jcas, getLanguage2(), getText2(), getDocumentId2(), getTitle2());
}
catch (TextClassificationException e) {
throw new CollectionException(e);
}
catch (CASException e) {
throw new CollectionException(e);
}
}
protected void createView(String part, JCas jCas, String language, String text, String docId,
String docTitle)
throws CASException
{
JCas view = jCas.createView(part.toString());
view.setDocumentText(text);
view.setDocumentLanguage(language);
TextClassificationTarget aTarget = new TextClassificationTarget(view, 0, text.length());
aTarget.addToIndexes();
DocumentMetaData baseMetaData = DocumentMetaData.get(jCas);
createMetaData(view, baseMetaData.getCollectionId(), docId, docTitle);
}
protected void createMetaData(JCas jcas, String collectionId, String docId, String docTitle)
{
DocumentMetaData metaData = DocumentMetaData.create(jcas);
metaData.setCollectionId(collectionId);
metaData.setDocumentBaseUri("");
metaData.setDocumentUri("/" + docId);
metaData.setDocumentTitle(docTitle);
metaData.setDocumentId(docId);
}
}