package org.infinispan.query.indexmanager;
import java.io.Serializable;
import org.hibernate.search.backend.AddLuceneWork;
import org.hibernate.search.backend.DeleteLuceneWork;
import org.hibernate.search.backend.FlushLuceneWork;
import org.hibernate.search.backend.LuceneWork;
import org.hibernate.search.backend.OptimizeLuceneWork;
import org.hibernate.search.backend.PurgeAllLuceneWork;
import org.hibernate.search.backend.UpdateLuceneWork;
import org.hibernate.search.backend.impl.WorkVisitor;
import org.infinispan.query.backend.KeyTransformationHandler;
/**
* The serialized form of LuceneWork needs to be adjusted after deserialization to apply
* our custom keyTransformers. LuceneWork instances are immutable, so we have to replace them
* with new instances iff an id transformation is needed.
*
* @author Sanne Grinovero <sanne@hibernate.org> (C) 2012 Red Hat Inc.
*/
public class LuceneWorkTransformationVisitor implements WorkVisitor<LuceneWorkIdTransformer> {
static final LuceneWorkTransformationVisitor INSTANCE = new LuceneWorkTransformationVisitor();
private static final LuceneWorkIdTransformer<AddLuceneWork> addDuplicator = new AddWorkDuplicator();
private static final LuceneWorkIdTransformer<DeleteLuceneWork> deleteDuplicator = new DeleteWorkDuplicator();
private static final LuceneWorkIdTransformer<UpdateLuceneWork> updateDuplicator = new UpdateWorkDuplicator();
private static final LuceneWorkIdTransformer<LuceneWork> returnSameDuplicator = new NotReallyDuplicator();
private LuceneWorkTransformationVisitor() {
//no instances needed
}
@Override
public LuceneWorkIdTransformer getDelegate(AddLuceneWork addLuceneWork) {
return addDuplicator;
}
@Override
public LuceneWorkIdTransformer getDelegate(DeleteLuceneWork deleteLuceneWork) {
return deleteDuplicator;
}
@Override
public LuceneWorkIdTransformer getDelegate(UpdateLuceneWork updateLuceneWork) {
return updateDuplicator;
}
@Override
public LuceneWorkIdTransformer getDelegate(OptimizeLuceneWork optimizeLuceneWork) {
return returnSameDuplicator;
}
@Override
public LuceneWorkIdTransformer getDelegate(FlushLuceneWork flushLuceneWork) {
return returnSameDuplicator;
}
@Override
public LuceneWorkIdTransformer getDelegate(PurgeAllLuceneWork purgeAllLuceneWork) {
return returnSameDuplicator;
}
private static class AddWorkDuplicator implements LuceneWorkIdTransformer<AddLuceneWork> {
@Override
public AddLuceneWork cloneOverridingIdString(final AddLuceneWork lw, final KeyTransformationHandler keyTransformationHandler) {
final Serializable id = lw.getId();
if (id == null) {
//this is serialized work received from a remote node: take the getIdAsString instead
final String idInString = lw.getIdInString();
return new AddLuceneWork(idInString, idInString, lw.getEntityClass(), lw.getDocument(), lw.getFieldToAnalyzerMap());
}
else {
return lw;
}
}
}
private static class UpdateWorkDuplicator implements LuceneWorkIdTransformer<UpdateLuceneWork> {
@Override
public UpdateLuceneWork cloneOverridingIdString(final UpdateLuceneWork lw, final KeyTransformationHandler keyTransformationHandler) {
final Serializable id = lw.getId();
if (id == null) {
//this is serialized work received from a remote node: take the getIdAsString instead
final String idInString = lw.getIdInString();
return new UpdateLuceneWork(idInString, idInString, lw.getEntityClass(), lw.getDocument(), lw.getFieldToAnalyzerMap());
}
else {
return lw;
}
}
}
private static class DeleteWorkDuplicator implements LuceneWorkIdTransformer<DeleteLuceneWork> {
@Override
public DeleteLuceneWork cloneOverridingIdString(final DeleteLuceneWork lw, final KeyTransformationHandler keyTransformationHandler) {
final Serializable id = lw.getId();
if (id == null) {
//this is serialized work received from a remote node: take the getIdAsString instead
final String idInString = lw.getIdInString();
return new DeleteLuceneWork(idInString, idInString, lw.getEntityClass());
}
else {
return lw;
}
}
}
/**
* The remaining cases don't need any key transformation, so we return the same instance.
* Not particularly tricky since these are immutable anyway.
*/
private static class NotReallyDuplicator implements LuceneWorkIdTransformer<LuceneWork> {
@Override
public LuceneWork cloneOverridingIdString(final LuceneWork lw, final KeyTransformationHandler keyTransformationHandler) {
return lw;
}
}
}