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/*******************************************************************************
* Copyright (c) 2010-2015, Bergmann Gabor, Istvan Rath and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.psystem.queries;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import tools.refinery.viatra.runtime.matchers.ViatraQueryRuntimeException;
import tools.refinery.viatra.runtime.matchers.backend.IQueryBackendFactory;
import tools.refinery.viatra.runtime.matchers.backend.QueryEvaluationHint;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.psystem.PBody;
import tools.refinery.viatra.runtime.matchers.psystem.TypeJudgement;
import tools.refinery.viatra.runtime.matchers.psystem.annotations.PAnnotation;
import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
import tools.refinery.viatra.runtime.matchers.util.Preconditions;
/**
* Default implementation of PQuery.
*
* @author Bergmann Gabor
*/
public abstract class BasePQuery implements PQuery {
protected PQueryStatus status = PQueryStatus.UNINITIALIZED;
/**
* @since 2.0
*/
protected final PVisibility visibility;
protected List<PProblem> pProblems = new ArrayList<PProblem>();
private List<PAnnotation> annotations = new ArrayList<PAnnotation>();
private QueryEvaluationHint evaluationHints = new QueryEvaluationHint(null, (IQueryBackendFactory)null);
PDisjunction canonicalDisjunction;
private List<String> parameterNames = null; // Lazy initialization
/** For traceability only. */
private List<Object> wrappingQuerySpecifications = new ArrayList<Object>(1);
@Override
public Integer getPositionOfParameter(String parameterName) {
ensureInitialized();
int index = getParameterNames().indexOf(parameterName);
return index != -1 ? index : null;
}
protected void setStatus(PQueryStatus newStatus) {
this.status = newStatus;
}
protected void addError(PProblem problem) {
status = PQueryStatus.ERROR;
pProblems.add(problem);
}
@Override
public PQueryStatus getStatus() {
return status;
}
@Override
public List<PProblem> getPProblems() {
return Collections.unmodifiableList(pProblems);
}
@Override
public boolean isMutable() {
return status.equals(PQueryStatus.UNINITIALIZED) || status.equals(PQueryStatus.INITIALIZING);
}
@Override
public void checkMutability() {
Preconditions.checkState(isMutable(), "Cannot edit query definition %s", getFullyQualifiedName());
}
/**
* @since 1.5
*/
public void setEvaluationHints(QueryEvaluationHint hints) {
checkMutability();
this.evaluationHints = hints;
}
@Override
public QueryEvaluationHint getEvaluationHints() {
ensureInitialized();
return evaluationHints;
// TODO instead of field, compute something from annotations?
}
protected void addAnnotation(PAnnotation annotation) {
checkMutability();
annotations.add(annotation);
}
@Override
public List<PAnnotation> getAllAnnotations() {
ensureInitialized();
return new ArrayList<>(annotations);
}
private Stream<PAnnotation> getAnnotationStreamByName(final String name) {
ensureInitialized();
return annotations.stream().filter(Objects::nonNull).filter(annotation -> Objects.equals(name, annotation.getName()));
}
@Override
public List<PAnnotation> getAnnotationsByName(final String annotationName) {
return getAnnotationStreamByName(annotationName).collect(Collectors.toList());
}
@Override
public Optional<PAnnotation> getFirstAnnotationByName(String annotationName) {
return getAnnotationStreamByName(annotationName).findFirst();
}
@Override
public List<String> getParameterNames() {
ensureInitialized();
if (parameterNames == null) {
parameterNames = getParameters().stream().map(PParameter::getName).collect(Collectors.toList());
}
return parameterNames;
}
@Override
public Set<PQuery> getDirectReferredQueries() {
ensureInitialized();
return canonicalDisjunction.getDirectReferredQueries();
}
@Override
public Set<PQuery> getAllReferredQueries() {
ensureInitialized();
return canonicalDisjunction.getAllReferredQueries();
}
@Override
public List<Object> publishedAs() {
return wrappingQuerySpecifications;
}
@Override
public Set<TypeJudgement> getTypeGuarantees() {
ensureInitialized();
Set<TypeJudgement> result = new HashSet<TypeJudgement>();
List<PParameter> parameters = getParameters();
for (int i=0; i<parameters.size(); ++i) {
PParameter parameter = parameters.get(i);
IInputKey declaredUnaryType = parameter.getDeclaredUnaryType();
if (declaredUnaryType != null) {
result.add(new TypeJudgement(declaredUnaryType, Tuples.staticArityFlatTupleOf(i)));
}
}
return result;
}
/**
* @since 2.0
*/
public BasePQuery(PVisibility visibility) {
super();
this.visibility = visibility;
}
@Override
public PDisjunction getDisjunctBodies() {
ensureInitialized();
Preconditions.checkState(!status.equals(PQueryStatus.ERROR), "Query %s contains errors.", getFullyQualifiedName());
return canonicalDisjunction;
}
@Override
public final void ensureInitialized() {
try {
if (status.equals(PQueryStatus.UNINITIALIZED)) {
setStatus(PQueryStatus.INITIALIZING);
setBodies(doGetContainedBodies());
setStatus(PQueryStatus.OK);
}
} catch (QueryInitializationException e) {
addError(new PProblem(e, e.getShortMessage()));
throw e;
}
}
protected final void setBodies(Set<PBody> bodies) {
canonicalDisjunction = new PDisjunction(this, bodies);
for (PBody body : canonicalDisjunction.getBodies()) {
body.setStatus(null);
}
setStatus(PQueryStatus.OK);
}
/**
* Creates and returns the bodies of the query. If recalled again, a new instance is created.
*
* @return
* @throws ViatraQueryRuntimeException
*/
protected abstract Set<PBody> doGetContainedBodies();
@Override
public String toString() {
return String.format("PQuery<%s>=%s", getFullyQualifiedName(), super.toString());
}
/**
* @since 2.0
*/
@Override
public PVisibility getVisibility() {
return visibility;
}
}
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