source: events/src/main/java/geniusweb/inform/OptIn.java@ 22

package geniusweb.inform;

import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.stream.Collectors;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import geniusweb.actions.PartyId;
import geniusweb.actions.Votes;

/**
 * Informs party that it's time to Opt-in.
 */
public class OptIn implements Inform {

        private final List<Votes> votes;

        /**
         * @param votes a list of votes. There may be only one votes per party.
         */
        @JsonCreator
        public OptIn(@JsonProperty("votes") List<Votes> votes) {
                this.votes = votes;

                Map<PartyId, Long> counts = votes.stream().map(vote -> vote.getActor())
                                .collect(Collectors.groupingBy(actor -> actor,
                                                Collectors.counting()));
                Optional<Entry<PartyId, Long>> nonunique = counts.entrySet().stream()
                                .filter(entry -> entry.getValue() > 1).findAny();
                if (nonunique.isPresent())
                        throw new IllegalArgumentException(
                                        "OptIn contains multiple Votes for party "
                                                        + nonunique.get().getKey());

        }

        /**
         * @return list of votes that can be opted in to
         */
        public List<Votes> getVotes() {
                return Collections.unmodifiableList(votes);
        }

        @Override
        public int hashCode() {
                final int prime = 31;
                int result = 1;
                result = prime * result + ((votes == null) ? 0 : votes.hashCode());
                return result;
        }

        @Override
        public boolean equals(Object obj) {
                if (this == obj)
                        return true;
                if (obj == null)
                        return false;
                if (getClass() != obj.getClass())
                        return false;
                OptIn other = (OptIn) obj;
                if (votes == null) {
                        if (other.votes != null)
                                return false;
                } else if (!votes.equals(other.votes))
                        return false;
                return true;
        }

        @Override
        public String toString() {
                return "OptIn[" + votes + "]";
        }

}