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/*******************************************************************************
* Copyright (c) 2010-2012, Abel Hegedus, Mark Czotter, 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.api;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import tools.refinery.viatra.runtime.api.impl.BaseQueryGroup;
import tools.refinery.viatra.runtime.registry.IQuerySpecificationRegistry;
import tools.refinery.viatra.runtime.registry.IQuerySpecificationRegistryEntry;
import tools.refinery.viatra.runtime.registry.IQuerySpecificationRegistryChangeListener;
import tools.refinery.viatra.runtime.registry.IRegistryView;
import tools.refinery.viatra.runtime.registry.IRegistryViewFilter;
import tools.refinery.viatra.runtime.registry.QuerySpecificationRegistry;
/**
* Package based {@link BaseQueryGroup} implementation. It handles patterns as a group within the same package.
*
* @author Abel Hegedus, Mark Czotter
*
*/
public class PackageBasedQueryGroup extends BaseQueryGroup {
private final Set<IQuerySpecification<?>> querySpecifications = new HashSet<>();
private final String packageName;
private final boolean includeSubPackages;
private IRegistryView view;
/**
* Creates a query group with specifications of a given package from the {@link QuerySpecificationRegistry}. Only
* query specifications with the exact package fully qualified name are included.
*
* @param packageName
* that contains the specifications
*/
public PackageBasedQueryGroup(String packageName) {
this(packageName, false);
}
/**
* Creates a query group with specifications of a given package from the {@link QuerySpecificationRegistry}.
*
* @param packageName
* that contain the specifications
* @param includeSubPackages
* if true all query specifications with package names starting with the given package are included
*/
public PackageBasedQueryGroup(String packageName, boolean includeSubPackages) {
super();
this.packageName = packageName;
this.includeSubPackages = includeSubPackages;
IQuerySpecificationRegistry registry = QuerySpecificationRegistry.getInstance();
view = registry.createView(new PackageNameBasedViewFilter());
for (IQuerySpecificationRegistryEntry entry : view.getEntries()) {
this.querySpecifications.add(entry.get());
}
SpecificationSetUpdater listener = new SpecificationSetUpdater();
view.addViewListener(listener);
}
@Override
public Set<IQuerySpecification<?>> getSpecifications() {
return Collections.unmodifiableSet(new HashSet<>(querySpecifications));
}
public String getPackageName() {
return packageName;
}
public boolean isIncludeSubPackages() {
return includeSubPackages;
}
/**
* Refreshes the pattern group from the query specification registry based on the parameters used during the
* initialization.
*/
public void refresh() {
// do nothing, view is automatically refreshed
}
/**
* Listener to update the specification set
*
* @author Abel Hegedus
*
*/
private final class SpecificationSetUpdater implements IQuerySpecificationRegistryChangeListener {
@Override
public void entryAdded(IQuerySpecificationRegistryEntry entry) {
querySpecifications.add(entry.get());
}
@Override
public void entryRemoved(IQuerySpecificationRegistryEntry entry) {
querySpecifications.remove(entry.get());
}
}
/**
* Registry view filter that checks FQNs against the given package name.
*
* @author Abel Hegedus
*
*/
private final class PackageNameBasedViewFilter implements IRegistryViewFilter {
@Override
public boolean isEntryRelevant(IQuerySpecificationRegistryEntry entry) {
String fqn = entry.getFullyQualifiedName();
if (packageName.length() + 1 < fqn.length()) {
if (includeSubPackages) {
if (fqn.startsWith(packageName + '.')) {
return true;
}
} else {
String name = fqn.substring(fqn.lastIndexOf('.') + 1, fqn.length());
if (fqn.equals(packageName + '.' + name)) {
return true;
}
}
}
return false;
}
}
}
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