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/*******************************************************************************
* Copyright (c) 2010-2018, Gabor Bergmann, IncQuery Labs Ltd.
* 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.scopes;
import java.util.Map;
import java.util.Optional;
import tools.refinery.viatra.runtime.matchers.context.AbstractQueryRuntimeContext;
import tools.refinery.viatra.runtime.matchers.context.IInputKey;
import tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContextListener;
import tools.refinery.viatra.runtime.matchers.scopes.tables.IIndexTable;
import tools.refinery.viatra.runtime.matchers.scopes.tables.ITableContext;
import tools.refinery.viatra.runtime.matchers.tuple.ITuple;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.util.Accuracy;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
/**
* An abstract runtime context that serves enumerable input key instances from tables.
*
* <p>
* Usage: first, instantiate {@link IIndexTable} tables with this as the 'tableContext' argument. Call
* {@link #registerIndexTable(IIndexTable)} to register them; this may happen either during a coalesced indexing, or on
* external initiation. Afterwards, they will be visible to the query backends.
* <p>
* <strong>EXPERIMENTAL</strong>. This class or interface has been added as
* part of a work in progress. There is no guarantee that this API will
* work or that it will remain the same.
*
* @author Gabor Bergmann
* @since 2.0
*/
public abstract class TabularRuntimeContext extends AbstractQueryRuntimeContext implements ITableContext {
private Map<IInputKey, IIndexTable> instanceTables = CollectionsFactory.createMap();
public void registerIndexTable(IIndexTable table) {
IInputKey inputKey = table.getInputKey();
instanceTables.put(inputKey, table);
}
/**
* @return null if the table is not registered
*/
public IIndexTable peekIndexTable(IInputKey key) {
return instanceTables.get(key);
}
/**
* If the table is not registered, {@link #handleUnregisteredTableRequest(IInputKey)} is invoked; it may handle it
* by raising an error or e.g. on-demand index construction
*/
public IIndexTable getIndexTable(IInputKey key) {
IIndexTable table = instanceTables.get(key);
if (table != null)
return table;
else
return handleUnregisteredTableRequest(key);
}
/**
* Override this to provide on-demand table registration
*/
protected IIndexTable handleUnregisteredTableRequest(IInputKey key) {
throw new IllegalArgumentException(key.getPrettyPrintableName());
}
@Override
public int countTuples(IInputKey key, TupleMask seedMask, ITuple seed) {
return getIndexTable(key).countTuples(seedMask, seed);
}
@Override
public Optional<Long> estimateCardinality(IInputKey key, TupleMask groupMask, Accuracy requiredAccuracy) {
return getIndexTable(key).estimateProjectionSize(groupMask, requiredAccuracy);
}
@Override
public Iterable<Tuple> enumerateTuples(IInputKey key, TupleMask seedMask, ITuple seed) {
return getIndexTable(key).enumerateTuples(seedMask, seed);
}
@Override
public Iterable<? extends Object> enumerateValues(IInputKey key, TupleMask seedMask, ITuple seed) {
return getIndexTable(key).enumerateValues(seedMask, seed);
}
@Override
public boolean containsTuple(IInputKey key, ITuple seed) {
if (key.isEnumerable()) {
return getIndexTable(key).containsTuple(seed);
} else {
return isContainedInStatelessKey(key, seed);
}
}
@Override
public void addUpdateListener(IInputKey key, Tuple seed, IQueryRuntimeContextListener listener) {
getIndexTable(key).addUpdateListener(seed, listener);
}
@Override
public void removeUpdateListener(IInputKey key, Tuple seed, IQueryRuntimeContextListener listener) {
getIndexTable(key).removeUpdateListener(seed, listener);
}
/**
* Handles non-enumerable input keys that are not backed by a table
*/
protected abstract boolean isContainedInStatelessKey(IInputKey key, ITuple seed);
}
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