/*
* #%L
* =====================================================
* _____ _ ____ _ _ _ _
* |_ _|_ __ _ _ ___| |_ / __ \| | | | ___ | | | |
* | | | '__| | | / __| __|/ / _` | |_| |/ __|| |_| |
* | | | | | |_| \__ \ |_| | (_| | _ |\__ \| _ |
* |_| |_| \__,_|___/\__|\ \__,_|_| |_||___/|_| |_|
* \____/
*
* =====================================================
*
* Hochschule Hannover
* (University of Applied Sciences and Arts, Hannover)
* Faculty IV, Dept. of Computer Science
* Ricklinger Stadtweg 118, 30459 Hannover, Germany
*
* Email: trust@f4-i.fh-hannover.de
* Website: http://trust.f4.hs-hannover.de/
*
* This file is part of visitmeta-dataservice, version 0.6.0,
* implemented by the Trust@HsH research group at the Hochschule Hannover.
* %%
* Copyright (C) 2012 - 2016 Trust@HsH
* %%
* 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.
* #L%
*/
package de.hshannover.f4.trust.visitmeta.persistence;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import de.hshannover.f4.trust.visitmeta.dataservice.graphservice.NamespaceHolder;
import de.hshannover.f4.trust.visitmeta.dataservice.internalDatatypes.InternalIdentifier;
import de.hshannover.f4.trust.visitmeta.dataservice.internalDatatypes.InternalLink;
import de.hshannover.f4.trust.visitmeta.dataservice.internalDatatypes.InternalMetadata;
import de.hshannover.f4.trust.visitmeta.ifmap.PollResult;
import de.hshannover.f4.trust.visitmeta.ifmap.ResultItem;
public abstract class AbstractWriter implements Writer {
protected Repository mRepo;
protected Long mLastTimestamp;
protected String mConnectionName;
private static final Logger log = Logger.getLogger(AbstractWriter.class);
public abstract void finishTransaction();
public abstract void beginTransaction();
protected abstract void submitUpdate(List<InternalMetadata> meta);
protected abstract void submitDelete(int n);
protected void savePrexif(InternalMetadata m) {
String prefix = null, value = null;
for (String key : m.getProperties()) {
if (key.contains("@xmlns")) {
prefix = key.substring(key.indexOf("@xmlns") + 7,
key.length() - 1);
value = m.valueFor(key);
}
}
if (prefix != null && value != null) {
NamespaceHolder.addPrefix(mConnectionName, prefix, value);
}
}
@Override
public void submitPollResult(PollResult pr) {
beginTransaction();
for (ResultItem resultItem : pr.getResults()) {
switch (resultItem.getType()) {
case UPDATE:
case SEARCH:
case NOTIFY:
if (resultItem.getId1() == null) {
submitUpdate(resultItem.getId2(), resultItem.getMetadata());
} else if (resultItem.getId2() == null) {
submitUpdate(resultItem.getId1(), resultItem.getMetadata());
} else {
submitUpdate(resultItem.getId1(), resultItem.getId2(),
resultItem.getMetadata());
}
break;
case DELETE:
if (resultItem.getId1() == null) {
submitDelete(resultItem.getId2(), resultItem.getMetadata());
} else if (resultItem.getId2() == null) {
submitDelete(resultItem.getId1(), resultItem.getMetadata());
} else {
submitDelete(resultItem.getId1(), resultItem.getId2(),
resultItem.getMetadata());
}
break;
default:
break;
}
}
finishTransaction();
}
protected void submitUpdate(InternalIdentifier id,
List<InternalMetadata> meta) {
log.debug("Got update for a single identifier");
InternalIdentifier in = mRepo.findIdentifier(id);
List<InternalMetadata> unique = new ArrayList<InternalMetadata>();
SubmitStatus status = new SubmitStatus(meta.size());
if (in == null) {
in = mRepo.insert(id);
for (InternalMetadata m : meta) {
in.addMetadata(m);
unique.add(m);
status.added();
}
} else {
for (InternalMetadata m : meta) {
if (!in.hasMetadata(m)) {
in.addMetadata(m);
unique.add(m);
status.added();
} else {
if (m.isSingleValue()) {
if (!in.equalsSingleValue(m)) {
in.updateMetadata(m);
unique.add(m);
status.updated();
}
}
}
}
}
this.submitUpdate(unique);
log.debug(status);
log.trace("Added update for a single identifier");
}
protected void submitUpdate(InternalIdentifier id1, InternalIdentifier id2,
List<InternalMetadata> meta) {
log.debug("Persistance got update for two identifiers");
InternalIdentifier idGraph1 = mRepo.findIdentifier(id1);
InternalIdentifier idGraph2 = mRepo.findIdentifier(id2);
InternalLink l;
List<InternalMetadata> unique = new ArrayList<InternalMetadata>();
SubmitStatus status = new SubmitStatus(meta.size());
if (idGraph1 != null && idGraph2 != null) {
// both identifiers are in the graph, this means we either have to update the metadata
// on the link between them or establish a new link between them
log.trace("Found both identifier in the graph");
l = mRepo.findCommonLink(idGraph1, idGraph2);
if (l == null) {
l = mRepo.connect(idGraph1, idGraph2);
}
for (InternalMetadata m : meta) {
if (!l.hasMetadata(m)) {
l.addMetadata(m);
unique.add(m);
status.added();
} else {
if (m.isSingleValue()) {
if (!l.equalsSingleValue(m)) {
l.updateMetadata(m);
unique.add(m);
status.updated();
}
}
}
}
} else if (idGraph1 != null && idGraph2 == null) {
// add link to idGraph1 with metadata
log.trace("Found one identifier in the graph");
idGraph2 = mRepo.insert(id2);
l = mRepo.connect(idGraph1, idGraph2);
for (InternalMetadata m : meta) {
l.addMetadata(m);
unique.add(m);
status.added();
}
} else if (idGraph1 == null && idGraph2 != null) {
// add link to idGraph2 with metadata
log.trace("Found one identifier in the graph");
idGraph1 = mRepo.insert(id1);
l = mRepo.connect(idGraph1, idGraph2);
for (InternalMetadata m : meta) {
l.addMetadata(m);
unique.add(m);
status.added();
}
} else {
// both links are not in the graph
idGraph1 = mRepo.insert(id1);
idGraph2 = mRepo.insert(id2);
l = mRepo.connect(idGraph1, idGraph2);
for (InternalMetadata m : meta) {
l.addMetadata(m);
unique.add(m);
status.added();
}
}
this.submitUpdate(unique);
log.debug(status);
log.trace("Added update for two identifiers");
}
protected void submitDelete(InternalIdentifier id1, InternalIdentifier id2,
List<InternalMetadata> meta) {
log.debug("Persistance got delete for two identifiers");
InternalIdentifier idGraph1 = mRepo.findIdentifier(id1);
InternalIdentifier idGraph2 = null;
InternalLink linkToEdit = null;
SubmitStatus status = new SubmitStatus(meta.size());
int n = 0;
if (idGraph1 == null) {
throw new RuntimeException(
"Someone is trying to delete from an non initiated identifier.");
}
for (InternalLink l : idGraph1.getLinks()) {
if (l.getIdentifiers().getFirst().equals(id2)
|| l.getIdentifiers().getSecond().equals(id2)) {
linkToEdit = l;
break;
}
}
if (linkToEdit != null) {
for (InternalMetadata m : meta) {
if (linkToEdit.hasMetadata(m)) {
linkToEdit.removeMetadata(m);
n++;
status.removed();
}
}
if (linkToEdit.getMetadata().size() == 0) {
log.trace("Deleting link " + linkToEdit);
idGraph1 = linkToEdit.getIdentifiers().getFirst();
idGraph2 = linkToEdit.getIdentifiers().getSecond();
mRepo.disconnect(idGraph1, idGraph2);
}
} else {
throw new RuntimeException(
"Someone is trying to delete from a link that is not in the graph or not connected to the given identifiers. Bad Boy!");
}
this.submitDelete(n);
log.debug(status);
log.trace("Performed delete for two identifiers");
}
protected void submitDelete(InternalIdentifier id,
List<InternalMetadata> meta) {
log.debug("Got delete for single identifier");
InternalIdentifier idGraph = mRepo.findIdentifier(id);
SubmitStatus status = new SubmitStatus(meta.size());
int n = 0;
if (idGraph != null) {
for (InternalMetadata m : meta) {
if (idGraph.hasMetadata(m)) {
idGraph.removeMetadata(m);
n++;
status.removed();
}
}
} else {
throw new RuntimeException(
"Someone is trying to delete from an identifier that is not in the graph. Bad Boy!");
}
this.submitDelete(n);
log.debug(status);
log.trace("Performed delete for a single identifier");
}
}