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//               The Next Generation Logic Library                       //
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//  Copyright 2015-20xx Christoph Zengler                                //
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//  Licensed under the Apache License, Version 2.0 (the "License");      //
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package org.logicng.cardinalityconstraints;

import org.logicng.datastructures.EncodingResult;
import org.logicng.formulas.Variable;

/**
 * The interface for exactly-k (ALK) cardinality constraints.
 * @version 2.0.0
 * @since 1.1
 */
public interface CCExactlyK {
    /**
     * Builds a cardinality constraint of the form {@code var_1 + var_2 + ... + var_n = k}.
     * @param result the result of the encoding
     * @param vars   the variables {@code var_1 ... var_n}
     * @param rhs    the right-hand side {@code k} of the constraint
     * @throws IllegalArgumentException if the right-hand side of the cardinality constraint is negative
     */
    void build(final EncodingResult result, final Variable[] vars, int rhs);

    /**
     * Returns the incremental data for the current encoded constraint.
     * @return the incremental data for the current encoded constraint
     */
    CCIncrementalData incrementalData();
}