org.coode.owlapi.obo.renderer.OBOFlatFileRenderer Maven / Gradle / Ivy
/*
* This file is part of the OWL API.
*
* The contents of this file are subject to the LGPL License, Version 3.0.
*
* Copyright (C) 2011, The University of Manchester
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
*
* Copyright 2011, University of Manchester
*
* 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.coode.owlapi.obo.renderer;
import java.io.IOException;
import java.io.Writer;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.coode.owlapi.obo.parser.OBOVocabulary;
import org.semanticweb.owlapi.io.AbstractOWLRenderer;
import org.semanticweb.owlapi.io.OWLRendererException;
import org.semanticweb.owlapi.io.XMLUtils;
import org.semanticweb.owlapi.model.AxiomType;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnnotation;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLClassAxiom;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLDataPropertyExpression;
import org.semanticweb.owlapi.model.OWLDataRange;
import org.semanticweb.owlapi.model.OWLDisjointClassesAxiom;
import org.semanticweb.owlapi.model.OWLEntity;
import org.semanticweb.owlapi.model.OWLEquivalentClassesAxiom;
import org.semanticweb.owlapi.model.OWLImportsDeclaration;
import org.semanticweb.owlapi.model.OWLIndividual;
import org.semanticweb.owlapi.model.OWLLiteral;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
import org.semanticweb.owlapi.model.OWLObjectIntersectionOf;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.model.OWLObjectPropertyExpression;
import org.semanticweb.owlapi.model.OWLObjectUnionOf;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyManager;
import org.semanticweb.owlapi.model.OWLProperty;
import org.semanticweb.owlapi.model.OWLPropertyExpression;
import org.semanticweb.owlapi.model.OWLRestriction;
import org.semanticweb.owlapi.model.OWLSubClassOfAxiom;
import org.semanticweb.owlapi.model.OWLSubPropertyChainOfAxiom;
import org.semanticweb.owlapi.model.SWRLRule;
import org.semanticweb.owlapi.util.NamespaceUtil;
import org.semanticweb.owlapi.util.SimpleShortFormProvider;
import org.semanticweb.owlapi.util.VersionInfo;
import org.semanticweb.owlapi.vocab.OWLRDFVocabulary;
/**
* Author: Nick Drummond
* The University Of Manchester
* Bio Health Informatics Group
* Date: Dec 17, 2008
* Renders OBO 1.2 flat file format.
* OBO 1.2 is a subset of OWL, so a rendering of an arbitrary OWL ontology may be incomplete in OBO.
* Several features are currently not implemented:
* - Exception handling for unsupported constructs - these are currently reported in stderr
* - axiom annotations (these might be serialisable as inline comments - although OBO parsers provide no
* guarantees these will be roundtripped)
* - anonymous classes/properties - it is not clear what this means in OBO
* - datatype restrictions
* - namespace and derived tags for relationships etc - it is not clear what this means in OBO
* - preservation of ordering on roundtripping exercises
* - Stanzas are ordered (classes, obj/data props then instances)
* - Entities are ordered by ID in each Stanza type
* - OBO tags are ordered WRT the OBO specifications
* Additional points:
* - cardinality is expressed as an '=' separated tag value pair in [1] and underspecified in [2]. OBOEdit 2
* does not parse this (at the time of writing) so this has been changed to standard TVP syntax
* - OBO 1.2 currently specifies pairwise disjointness which this renderer follows so files may get large
* - Exceptions are caught along the way and then wrapped in an OBOStorageIncompleteException which is thrown
* after serialisation ends
* References:
* [1] http://www.cs.man.ac.uk/~horrocks/obo/
* [2] http://www.geneontology.org/GO.format.obo-1_2.shtml
*/
public class OBOFlatFileRenderer extends AbstractOWLRenderer implements OBOExceptionHandler {
private OBORelationshipGenerator relationshipHandler;
private SimpleShortFormProvider sfp;
private String defaultPrefix;
private List exceptions = new ArrayList();
private NamespaceUtil nsUtil;
private String defaultNamespace;
private OWLDataFactory factory;
@Deprecated
@SuppressWarnings("unused")
protected OBOFlatFileRenderer(OWLOntologyManager owlOntologyManager) {
this();
}
protected OBOFlatFileRenderer() {
relationshipHandler = new OBORelationshipGenerator(this);
sfp = new SimpleShortFormProvider();
}
@Override
public void render(OWLOntology ontology, Writer writer) throws OWLRendererException {
factory = ontology.getOWLOntologyManager().getOWLDataFactory();
exceptions.clear();
IRI ontologyIRI = ontology.getOntologyID().getOntologyIRI();
if (ontologyIRI != null) {
final String ontURIStr = ontologyIRI.toString();
if (ontURIStr.endsWith("/")) {
defaultNamespace = ontURIStr;
} else {
defaultNamespace = ontURIStr + "#";
}
} else {
defaultNamespace = "urn:defaultOBONamespace:ontology"
+ System.currentTimeMillis() + "#";
System.err.println("WARNING: anonymous ontology saved in OBO format. Default namespace created for it.");
}
nsUtil = new NamespaceUtil();
defaultPrefix = nsUtil.getPrefix(defaultNamespace);
writeHeader(ontology, writer);
writeStanzas(ontology, writer);
if (!exceptions.isEmpty()) {
throw new OBOStorageIncompleteException(exceptions);
}
}
@Override
public void addException(OBOStorageException exception) {
exceptions.add(exception);
}
@Override
public List getExceptions() {
return exceptions;
}
private void writeHeader(OWLOntology ontology, Writer writer) {
OBOTagValuePairList tvpList = new OBOTagValuePairList(OBOVocabulary.getHeaderTags());
tvpList.setDefault(OBOVocabulary.DEFAULT_NAMESPACE, defaultPrefix);
for (OWLAnnotation ax : ontology.getAnnotations()) {
if (ax.getProperty().isComment()) {
tvpList.addPair(OBOVocabulary.REMARK, ((OWLLiteral) ax.getValue()).getLiteral());
}
else {
tvpList.visit(ax);
}
}
for (OWLImportsDeclaration importDecl : ontology.getImportsDeclarations()) {
tvpList.addPair(OBOVocabulary.IMPORT, importDecl.getIRI().toString());
}
Map namespace2PrefixMap = loadUsedNamespaces(ontology);
for (String namespace : namespace2PrefixMap.keySet()) {
String mapping = namespace2PrefixMap.get(namespace) + " " + namespace;
tvpList.addPair(OBOVocabulary.ID_SPACE, mapping);
}
// overwrite the existing values for below
tvpList.setPair(OBOVocabulary.FORMAT_VERSION, "1.2");
tvpList.setPair(OBOVocabulary.DATE, getTimestampFormatter().format(new Date(System.currentTimeMillis())));
tvpList.setPair(OBOVocabulary.SAVED_BY, System.getProperty("user.name"));
tvpList.setPair(OBOVocabulary.AUTO_GENERATED_BY, VersionInfo.getVersionInfo().toString());
tvpList.write(writer);
}
private Map loadUsedNamespaces(OWLOntology ontology) {
for (OWLEntity entity : ontology.getSignature()) {
final IRI base = IRI.create(XMLUtils.getNCNamePrefix(entity.getIRI()
.toString()));
nsUtil.getPrefix(base.toString());
}
return nsUtil.getNamespace2PrefixMap();
}
private void writeStanzas(OWLOntology ontology, Writer writer) {
write("\n\n! ---------------------- CLASSES -------------------------\n", writer);
final List sortedClasses = new ArrayList(ontology.getClassesInSignature());
Collections.sort(sortedClasses);
for (OWLClass cls : sortedClasses) {
writeTermStanza(cls, ontology, writer);
}
write("\n\n! ---------------------- PROPERTIES -------------------------\n", writer);
final List objProps = new ArrayList(ontology.getObjectPropertiesInSignature());
Collections.sort(objProps);
for (OWLObjectProperty property : objProps) {
writeTypeDefStanza(property, ontology, writer);
}
final List dataProps = new ArrayList(ontology.getDataPropertiesInSignature());
Collections.sort(dataProps);
for (OWLDataProperty property : dataProps) {
writeTypeDefStanza(property, ontology, writer);
}
write("\n\n! ---------------------- INSTANCES -------------------------\n", writer);
final List individuals = new ArrayList(ontology.getIndividualsInSignature());
Collections.sort(individuals);
for (OWLNamedIndividual individual : individuals) {
writeInstanceStanza(individual, ontology, writer);
}
// scan ontology for other constructs that cannot be translated
for (OWLClassAxiom ax : ontology.getGeneralClassAxioms()) {
if (ax instanceof OWLSubClassOfAxiom) {
exceptions.add(new OBOStorageException(ax, null, "Superclass GCI found in ontology cannot be translated to OBO"));
}
if (ax instanceof OWLEquivalentClassesAxiom) {
exceptions.add(new OBOStorageException(ax, null, "Equivalent class GCI found in ontology cannot be translated to OBO"));
}
if (ax instanceof OWLDisjointClassesAxiom) {
exceptions.add(new OBOStorageException(ax, null, "Disjoint axiom contains anonymous classes - cannot be translated to OBO"));
}
}
for (SWRLRule r : ontology.getAxioms(AxiomType.SWRL_RULE)) {
exceptions.add(new OBOStorageException(r, null, "SWRL rules cannot be translated to OBO"));
}
}
private void writeTermStanza(OWLClass cls, OWLOntology ontology, Writer writer) {
write("\n[", writer);
write(OBOVocabulary.TERM.getName(), writer);
write("]\n", writer);
// TODO is_anonymous??
OBOTagValuePairList tvpList = new OBOTagValuePairList(OBOVocabulary.getTermStanzaTags());
handleEntityBase(cls, ontology, tvpList);
relationshipHandler.setClass(cls);
for (OWLClassExpression superCls : cls.getSuperClasses(ontology)) {
if (!superCls.isAnonymous()) {
String superclassID = getID(superCls.asOWLClass());
tvpList.addPair(OBOVocabulary.IS_A, superclassID);
// TODO handle namespace and derived?
}
else if (superCls instanceof OWLRestriction) {
// TODO handle datatype restrictions
superCls.accept(relationshipHandler);
}
else {
exceptions.add(new OBOStorageException(cls, superCls, "OBO format only supports named superclass or someValuesFrom restrictions"));
}
}
final OWLClass owlThing = factory.getOWLThing();
// if no named superclass is specified, then this must be asserted to be a subclass of owlapi:Thing
if (!cls.equals(owlThing) && tvpList.getValues(OBOVocabulary.IS_A).isEmpty()) {
tvpList.addPair(OBOVocabulary.IS_A, getID(owlThing));
}
for (OWLClassExpression equiv : cls.getEquivalentClasses(ontology)) {
if (equiv instanceof OWLObjectIntersectionOf) {
handleIntersection(cls, (OWLObjectIntersectionOf) equiv, tvpList);
}
else if (equiv instanceof OWLObjectUnionOf) {
handleUnion(cls, (OWLObjectUnionOf) equiv, tvpList);
}
else if (equiv instanceof OWLRestriction) {
/* OBO equivalence must be of the form "A and p some B and ..."
* if this class is equiv to a restriction, put this into an intersection with owlapi:Thing as the named class
*/
OWLObjectIntersectionOf intersection = factory
.getOWLObjectIntersectionOf(owlThing, equiv);
handleIntersection(cls, intersection, tvpList);
}
else {
// TODO handle datatype restrictions
exceptions.add(new OBOStorageException(cls, equiv, "Cannot answer equivalent class that is not intersection or union"));
}
}
for (OWLClassExpression disjoint : cls.getDisjointClasses(ontology)) {
if (!disjoint.isAnonymous()) {
tvpList.addPair(OBOVocabulary.DISJOINT_FROM, getID(disjoint.asOWLClass()));
// TODO handle namespace and derived
}
else {
exceptions.add(new OBOStorageException(cls, disjoint, "Found anonymous disjoint class that cannot be represented in OBO"));
}
}
for (OBORelationship relationship : relationshipHandler.getOBORelationships()) {
// TODO handle datatype restrictions
handleRelationship(relationship, tvpList);
}
tvpList.write(writer);
}
private void handleIntersection(OWLClass cls, OWLObjectIntersectionOf intersectionOf, OBOTagValuePairList tvpList) {
for (OWLClassExpression op : intersectionOf.getOperands()) {
if (!op.isAnonymous()) {
tvpList.addPair(OBOVocabulary.INTERSECTION_OF, getID(op.asOWLClass()));
}
else {
relationshipHandler.setClass(cls);
op.accept(relationshipHandler);
Set relations = relationshipHandler.getOBORelationships();
if (!relations.isEmpty()) {
OBORelationship rel = relations.iterator().next();
tvpList.addPair(OBOVocabulary.INTERSECTION_OF, renderRestriction(rel));
}
else {
exceptions.add(new OBOStorageException(cls, op, "Found operand in intersection that cannot be represented"));
}
}
}
// TODO handle namespace
}
private String renderRestriction(OBORelationship rel) {
StringBuilder sb = new StringBuilder(getID(rel.getProperty()));
sb.append(" ");
sb.append(getID(rel.getFiller()));
return sb.toString();
}
private void handleUnion(OWLClass cls, OWLObjectUnionOf union, OBOTagValuePairList tvpList) {
for (OWLClassExpression op : union.getOperands()) {
if (!op.isAnonymous()) {
tvpList.addPair(OBOVocabulary.UNION_OF, getID(op.asOWLClass()));
}
else {
relationshipHandler.setClass(cls);
op.accept(relationshipHandler);
Set relations = relationshipHandler.getOBORelationships();
if (!relations.isEmpty()) {
OBORelationship rel = relations.iterator().next();
tvpList.addPair(OBOVocabulary.UNION_OF, renderRestriction(rel));
}
else {
exceptions.add(new OBOStorageException(cls, op, "Found operand in union that cannot be represented"));
}
}
}
}
private void handleRelationship(OBORelationship relationship, OBOTagValuePairList tvpList) {
StringBuilder sb = new StringBuilder();
sb.append(renderRestriction(relationship));
sb.append("\n");
if (relationship.getCardinality() >= 0) {
sb.append(OBOVocabulary.CARDINALITY.getName());
sb.append(":");
sb.append(Integer.toString(relationship.getCardinality()));
sb.append("\n");
}
if (relationship.getMaxCardinality() >= 0) {
sb.append(OBOVocabulary.MAX_CARDINALITY.getName());
sb.append(":");
sb.append(Integer.toString(relationship.getMaxCardinality()));
sb.append("\n");
}
if (relationship.getMinCardinality() >= 0) {
sb.append(OBOVocabulary.MIN_CARDINALITY.getName());
sb.append(":");
sb.append(Integer.toString(relationship.getMinCardinality()));
sb.append("\n");
}
tvpList.addPair(OBOVocabulary.RELATIONSHIP, sb.toString());
}
private OBOTagValuePairList handleCommonTypeDefStanza(P property, OWLOntology ontology, Writer writer) {
write("\n[", writer);
write(OBOVocabulary.TYPEDEF.getName(), writer);
write("]\n", writer);
OBOTagValuePairList tvpList = new OBOTagValuePairList(OBOVocabulary.getTypeDefStanzaTags());
handleEntityBase(property, ontology, tvpList);
Set domains = property.getDomains(ontology);
for (OWLClassExpression domain : domains) {
if (!domain.isAnonymous()) {
tvpList.addPair(OBOVocabulary.DOMAIN, getID(domain.asOWLClass()));
}
else {
exceptions.add(new OBOStorageException(property, domain, "Anonymous domain that cannot be represented in OBO"));
}
}
final Set> sp = property.getSuperProperties(ontology);
for (OWLPropertyExpression superProp : sp) {
if (!superProp.isAnonymous()) {
tvpList.addPair(OBOVocabulary.IS_A, getID((OWLProperty) superProp));
}
else {
exceptions.add(new OBOStorageException(property, superProp, "Anonymous property in superProperty is not supported in OBO"));
}
}
tvpList.setDefault(OBOVocabulary.IS_METADATA_TAG, "false"); // annotation properties only
return tvpList;
}
private void writeTypeDefStanza(OWLObjectProperty property, OWLOntology ontology, Writer writer) {
OBOTagValuePairList tvpList = handleCommonTypeDefStanza(property, ontology, writer);
for (OWLClassExpression range : property.getRanges(ontology)) {
if (!range.isAnonymous()) {
tvpList.addPair(OBOVocabulary.RANGE, getID(range.asOWLClass()));
}
else {
exceptions.add(new OBOStorageException(property, range, "Anonymous range that cannot be represented in OBO"));
}
}
if (property.isAsymmetric(ontology)) {
tvpList.addPair(OBOVocabulary.IS_ASYMMETRIC, "true");
}
if (property.isReflexive(ontology)) {
tvpList.addPair(OBOVocabulary.IS_REFLEXIVE, "true");
}
if (property.isSymmetric(ontology)) {
tvpList.addPair(OBOVocabulary.IS_SYMMETRIC, "true");
}
if (property.isTransitive(ontology)) {
tvpList.addPair(OBOVocabulary.IS_TRANSITIVE, "true");
}
for (OWLObjectPropertyExpression inv : property.getInverses(ontology)) {
if (!inv.isAnonymous()) {
tvpList.addPair(OBOVocabulary.INVERSE, getID(inv.asOWLObjectProperty()));
}
else {
exceptions.add(new OBOStorageException(property, inv, "Anonymous property in inverse is not supported in OBO"));
}
}
// transitive over
for (OWLSubPropertyChainOfAxiom ax : ontology.getAxioms(AxiomType.SUB_PROPERTY_CHAIN_OF)) {
if (ax.getSuperProperty().equals(property)) {
final List chain = ax.getPropertyChain();
if (chain.size() == 2 && chain.get(0).equals(property) && !chain.get(1).isAnonymous()) {
tvpList.addPair(OBOVocabulary.TRANSITIVE_OVER, getID(chain.get(1).asOWLObjectProperty()));
}
else {
exceptions.add(new OBOStorageException(property, ax, "Only property chains of form 'p o q -> p' supported"));
}
}
}
// TODO is RELATIONSHIP really a part of the typedef stanza?
tvpList.write(writer);
}
private void writeTypeDefStanza(OWLDataProperty property, OWLOntology ontology, Writer writer) {
OBOTagValuePairList tvpList = handleCommonTypeDefStanza(property, ontology, writer);
for (OWLDataRange range : property.getRanges(ontology)) {
if (range.isDatatype()) {
tvpList.addPair(OBOVocabulary.RANGE, range.asOWLDatatype().getIRI().toString());
}
else {
exceptions.add(new OBOStorageException(property, range, "Complex data range cannot be represented in OBO"));
}
}
// TODO is RELATIONSHIP really a part of the typedef stanza?
tvpList.write(writer);
}
private void writeInstanceStanza(OWLNamedIndividual individual, OWLOntology ontology, Writer writer) {
write("\n[", writer);
write(OBOVocabulary.INSTANCE.getName(), writer);
write("]\n", writer);
OBOTagValuePairList tvpList = new OBOTagValuePairList(OBOVocabulary.getInstanceStanzaTags());
if (individual.isAnonymous()) {
tvpList.setDefault(OBOVocabulary.IS_ANONYMOUS, "true");
}
handleEntityBase(individual, ontology, tvpList);
for (OWLClassExpression type : individual.getTypes(ontology)) {
if (!type.isAnonymous()) {
tvpList.addPair(OBOVocabulary.INSTANCE_OF, getID(type.asOWLClass()));
}
else {
exceptions.add(new OBOStorageException(individual, type, "Complex types cannot be represented in OBO"));
}
}
Map> objPropAssertions = individual.getObjectPropertyValues(ontology);
for (OWLObjectPropertyExpression p : objPropAssertions.keySet()) {
if (!p.isAnonymous()) {
for (OWLIndividual ind : objPropAssertions.get(p)) {
if (!ind.isAnonymous()) {
final String rel = renderRestriction(new OBORelationship(p.asOWLObjectProperty(), ind.asOWLNamedIndividual()));
tvpList.addPair(OBOVocabulary.PROPERTY_VALUE, rel);
}
}
}
else {
exceptions.add(new OBOStorageException(individual, p, "Anonymous property in assertion is not supported in OBO"));
}
}
Map> dataPropAssertions = individual.getDataPropertyValues(ontology);
for (OWLDataPropertyExpression p : dataPropAssertions.keySet()) {
if (!p.isAnonymous()) {
for (OWLLiteral literal : dataPropAssertions.get(p)) {
final String rel = renderPropertyAssertion(p.asOWLDataProperty(), literal);
tvpList.addPair(OBOVocabulary.PROPERTY_VALUE, rel);
}
}
else {
// no anonymous data properties so this should never occur
exceptions.add(new OBOStorageException(individual, p, "Anonymous property in assertion is not supported in OBO"));
}
}
tvpList.write(writer);
}
private void handleEntityBase(OWLEntity entity, OWLOntology ontology, OBOTagValuePairList tvpList) {
tvpList.addPair(OBOVocabulary.ID, getID(entity));
Set potentialNames = new HashSet();
for (OWLAnnotation annotation : entity.getAnnotations(ontology)) {
if (annotation.getProperty().getIRI().equals(OWLRDFVocabulary.RDFS_LABEL.getIRI())) {
potentialNames.add(annotation);
}
else if (annotation.getProperty().isComment()) {
tvpList.addPair(OBOVocabulary.COMMENT, ((OWLLiteral) annotation.getValue()).getLiteral());
}
else {
tvpList.visit(annotation);
}
}
if (tvpList.getValues(OBOVocabulary.NAME).isEmpty()) { // one name required!!
if (!potentialNames.isEmpty()) {
OWLAnnotation firstLabel = potentialNames.iterator().next();
tvpList.addPair(OBOVocabulary.NAME, ((OWLLiteral) firstLabel.getValue()).getLiteral());
potentialNames.remove(firstLabel);
}
else {
tvpList.addPair(OBOVocabulary.NAME, getID(entity));
}
}
// other labels just get rendered as label
for (OWLAnnotation anno : potentialNames) {
tvpList.visit(anno);
}
final String uri = entity.getIRI().toString();
if (!uri.startsWith(defaultNamespace)) {
final IRI base = IRI.create(XMLUtils.getNCNamePrefix(uri));
String prefix = nsUtil.getPrefix(base.toString());
tvpList.setDefault(OBOVocabulary.NAMESPACE, prefix);
}
}
private String renderPropertyAssertion(OWLDataProperty property, OWLLiteral literal) {
StringBuilder sb = new StringBuilder(getID(property));
sb.append(" \"");
sb.append(literal.getLiteral());
sb.append("\" ");
if (!literal.isRDFPlainLiteral()) {
sb.append(literal.getDatatype().getIRI());
}
return sb.toString();
}
private String getID(OWLEntity entity) {
return sfp.getShortForm(entity);
}
private void write(String s, Writer writer) {
try {
writer.write(s);
}
catch (IOException e) {
e.printStackTrace();
}
}
private DateFormat getTimestampFormatter() {
SimpleDateFormat sdf = new SimpleDateFormat();
sdf.applyPattern("dd:MM:yyyy HH:mm");
return sdf;
}
}