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/*******************************************************************************
* Copyright (c) 2010-2019, Tamas Szabo, itemis AG, 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.interpreter.rete.aggregation;
import java.util.AbstractMap.SimpleEntry;
import java.util.Collection;
import java.util.Map;
import java.util.Set;
import tools.refinery.interpreter.matchers.context.IQueryRuntimeContext;
import tools.refinery.interpreter.matchers.tuple.Tuple;
import tools.refinery.interpreter.matchers.tuple.Tuples;
/**
* An optimized {@link Map} implementation where each key is produced by joining together a group tuple and some other
* object (via left inheritance). Only a select few {@link Map} operations are supported. This collection is
* unmodifiable.
*
* Operations on this map assume that client queries also obey the contract that keys are constructed from a group tuple
* and an additional object.
*
* @author Tamas Szabo
* @since 2.4
*/
public class GroupedMap<GroupedKeyType, ValueType> implements Map<Tuple, ValueType> {
protected final Tuple group;
// cached group size value is to be used in get()
private final int groupSize;
protected final Map<GroupedKeyType, ValueType> mappings;
protected final IQueryRuntimeContext runtimeContext;
public GroupedMap(final Tuple group, final Map<GroupedKeyType, ValueType> mappings,
final IQueryRuntimeContext runtimeContext) {
this.group = group;
this.groupSize = group.getSize();
this.mappings = mappings;
this.runtimeContext = runtimeContext;
}
@Override
public int size() {
return this.mappings.size();
}
@Override
public boolean isEmpty() {
return this.mappings.isEmpty();
}
@Override
public boolean containsKey(final Object key) {
throw new UnsupportedOperationException();
}
@Override
public boolean containsValue(final Object value) {
return this.mappings.containsValue(value);
}
@Override
public ValueType get(final Object key) {
if (key instanceof Tuple) {
final Object value = ((Tuple) key).get(this.groupSize);
final Object unwrappedValue = this.runtimeContext.unwrapElement(value);
return this.mappings.get(unwrappedValue);
} else {
return null;
}
}
@Override
public ValueType put(final Tuple key, final ValueType value) {
throw new UnsupportedOperationException();
}
@Override
public ValueType remove(final Object key) {
throw new UnsupportedOperationException();
}
@Override
public void putAll(final Map<? extends Tuple, ? extends ValueType> map) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
@Override
public Set<Tuple> keySet() {
return new GroupedSet<Tuple, GroupedKeyType, Tuple>(this.group, this.mappings.keySet(), (g, v) -> {
return Tuples.staticArityLeftInheritanceTupleOf(g, this.runtimeContext.wrapElement(v));
});
}
@Override
public Collection<ValueType> values() {
return this.mappings.values();
}
@Override
public Set<Entry<Tuple, ValueType>> entrySet() {
return new GroupedSet<Tuple, GroupedKeyType, Entry<Tuple, ValueType>>(this.group, this.mappings.keySet(),
(g, v) -> {
final Tuple key = Tuples.staticArityLeftInheritanceTupleOf(g, this.runtimeContext.wrapElement(v));
final ValueType value = this.mappings.get(v);
return new SimpleEntry<Tuple, ValueType>(key, value);
});
}
}
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