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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.viatra.runtime.rete.aggregation;
import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
import java.util.function.BiFunction;
/**
* An optimized {@link Set} implementation where each contained value is produced by combining together a grouping value
* and some other (key) object. The way of combining together these two values is specified by the closure passed to the
* constructor. Only a select few {@link Set} operations are supported. This collection is unmodifiable.
*
* @author Tamas Szabo
* @since 2.4
*/
public class GroupedSet<GroupingValueType, GroupedKeyType, WholeKeyType> implements Set<WholeKeyType> {
protected final GroupingValueType group;
protected final Collection<GroupedKeyType> values;
protected final BiFunction<GroupingValueType, GroupedKeyType, WholeKeyType> valueFunc;
public GroupedSet(final GroupingValueType group, final Collection<GroupedKeyType> values,
final BiFunction<GroupingValueType, GroupedKeyType, WholeKeyType> valueFunc) {
this.group = group;
this.values = values;
this.valueFunc = valueFunc;
}
@Override
public int size() {
return this.values.size();
}
@Override
public boolean isEmpty() {
return this.values.isEmpty();
}
@Override
public boolean contains(final Object obj) {
throw new UnsupportedOperationException();
}
@Override
public Iterator<WholeKeyType> iterator() {
final Iterator<GroupedKeyType> wrapped = this.values.iterator();
return new Iterator<WholeKeyType>() {
@Override
public boolean hasNext() {
return wrapped.hasNext();
}
@Override
public WholeKeyType next() {
final GroupedKeyType value = wrapped.next();
return valueFunc.apply(group, value);
}
};
}
@Override
public Object[] toArray() {
throw new UnsupportedOperationException();
}
@Override
public <T> T[] toArray(final T[] arr) {
throw new UnsupportedOperationException();
}
@Override
public boolean add(final WholeKeyType tuple) {
throw new UnsupportedOperationException();
}
@Override
public boolean remove(final Object obj) {
throw new UnsupportedOperationException();
}
@Override
public boolean containsAll(final Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public boolean addAll(final Collection<? extends WholeKeyType> coll) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(final Collection<?> coll) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(final Collection<?> coll) {
throw new UnsupportedOperationException();
}
@Override
public void clear() {
throw new UnsupportedOperationException();
}
}
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