/*******************************************************************************
* Copyright 2014 Analog Devices, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
********************************************************************************/
package com.analog.lyric.benchmarking.utils.doublespace;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import com.google.common.collect.Iterables;
class SequenceIndexer implements Indexer
{
private final List<Indexer> _indexers;
private final Iterable<Integer> _iterable;
public SequenceIndexer(Indexer... indexers)
{
_indexers = Arrays.asList(indexers);
_iterable = Iterables.concat(indexers);
}
@Override
public int getCardinality()
{
int acc = 0;
for (final Indexer indexer : _indexers)
{
acc += indexer.getCardinality();
}
return acc;
}
@Override
public int getNth(int i)
{
int p = 0;
for (final Indexer indexer : _indexers)
{
final int order = indexer.getCardinality();
if (p + order > i)
{
return indexer.getNth(i - p);
}
p += order;
}
throw new IllegalArgumentException();
}
@Override
public Iterator<Integer> iterator()
{
return _iterable.iterator();
}
}