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/*
 * Copyright (c) 2010-2017, KolibriFX AS. Licensed under the Apache License, version 2.0.
 */

package com.kolibrifx.plovercrest.server.internal.folds;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.apache.commons.lang3.tuple.ImmutablePair;
import com.kolibrifx.plovercrest.server.streams.Stream;

/**
 * Specifies how input streams are set up when reading from a fold stream.
 * 
 * Adding inputs both decides the ordering of the readers (which can be significant if the inputs
 * have elements on the same timestamp) and the timestamps that each input should read from.
 */
public class FoldReaderInputs {
    private final List, Long>> inputs = new ArrayList<>();

    public void addInput(final Stream stream, final long fromTimestamp) {
        inputs.add(new ImmutablePair, Long>(stream, fromTimestamp));
    }

    public void addInputs(final Collection> streams, final long fromTimestamp) {
        for (final Stream s : streams) {
            addInput(s, fromTimestamp);
        }
    }

    public List, Long>> getInputs() {
        return Collections.unmodifiableList(inputs);
    }
}