com.analog.lyric.benchmarking.utils.doublespace.SequenceIndexer.java Source code

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Here is the source code for com.analog.lyric.benchmarking.utils.doublespace.SequenceIndexer.java

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/*******************************************************************************
 *   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();
    }

}